m
be certain.
318 Load Unit
Product Information
Model 318.10
Model 318.25
Model 318.50
100-183-837 B
Copyright information
Trademark information
© 2007, 2009 MTS Systems Corporation. All rights reserved.
MTS is a registered trademark of MTS Systems Corporation within the United
States. This trademark may be protected in other countries.
Molykote is a registered trademark of Dow Chemical Corporation. All other
trademarks or service marks are property of their respective owners.
Publication information
MANUAL PART NUMBER
PUBLICATION DATE
100-183-837 A
June 2007
100-183-837 B
April 2009
Contents
Technical Support 7
How to Get Technical Support
Before You Contact MTS
7
7
If You Contact MTS by Phone
9
Problem Submittal Form in MTS Manuals
10
Preface 11
Before You Begin
Conventions
11
12
Documentation Conventions
12
Introduction 15
Load Unit: Overview
15
318 Load Unit: Component Identification
318 Load Unit: Component Description
318 Load Unit: Specifications
17
18
20
Series 661 Force Transducer: Specifications
318 Load Unit: Dimensions
24
26
Safety 33
General Safety Practices
33
Safety Practices Before System Operation
34
Safety Practices While the System Is in Operation
Hazard Icons
39
41
318 Load Unit: Hazard Labels
42
45
318 Load Unit: Crush Point Hazards
318 Load Unit
45
Contents
3
Installation 47
318 Load Unit: Unpack Upright Configuration
47
318 Load Unit: Unpack Horizontal Configuration
318 Load Unit: Connect Cables
49
54
318 Load Unit: Connect Hydraulics
56
318 Load Unit: Unlock the Crosshead
56
Operation 59
Load Unit: Operation Preface
59
318 Load Unit: Control Module
60
318 Load Unit: Crush Point Hazards
62
318 Load Unit: Specimen Installation
62
318 Load Unit: Position the Crosshead Hydraulically
318 Load Unit: Position the Crosshead Manually
318 Load Unit: Adjust the Grips’ Clamp Rate
65
66
69
318 Load Unit: Adjust the Grips’ Clamp Force
70
Maintenance 73
Routine Maintenance Overview Checklist
74
318 Load Unit: Maintenance Intervals
318 Load Unit: Daily Inspections
318 Load Unit: Clean the Columns
318 Load Unit: Prevent Rust
77
78
78
79
318 Load Unit: Maintain Airmount Pressures
80
318 Load Unit: Bleed the Hydraulic Lift Cylinders
318 Load Unit: Adjust the Hydraulic Locks
81
83
318 Load Unit: Lubricate the Crosshead Locking Bolts
318 Load Unit: Align the Force Transducer
111 Accumulator: Maintenance Overview
87
93
111 Accumulator: Check and Change Precharge Pressure
244 Actuator: Maintenance
298 HSM: Maintenance
86
94
98
98
252 Servovalve: Maintenance Overview
100
252 Servovalve: Replace the Filter Element
252 Servovalve: Adjust the Mechanical Null
100
102
Servohydraulic Load Frame Maintenance and Service Logs 107
4
Contents
318 Load Unit
8 Hours/Daily
108
40 Hours/Weekly
109
80 Hours/Biweekly
110
500 Hours: Crosshead and Frame
500 Hours: Actuator
500 Hours: HSM
111
112
113
500 Hours: Hoses and Cables
114
500 Hours: Overall Complete System
115
500 Hours: Grips 116
1000 Hours
117
2000 Hours: Annual Maintenance
318 Load Unit
118
Contents
5
6
Contents
318 Load Unit
Technical Support
How to Get Technical Support
Start with your
manuals
The manuals supplied by MTS provide most of the information you need to use
and maintain your equipment. If your equipment includes MTS software, look
for online help and README files that contain additional product information.
If you cannot find answers to your technical questions from these sources, you
can use the internet, e-mail, telephone, or fax to contact MTS for assistance.
Technical support
methods
MTS web site
www.mts.com
MTS provides a full range of support services after your system is installed. If
you have any questions about a system or product, contact MTS in one of the
following ways.
The MTS web site gives you access to our technical support staff by means of a
Technical Support link:
www.mts.com > Contact MTS > Service & Technical Support
E-mail
Telephone
Fax
Technical support
outside the U.S.
techsupport@mts.com
MTS Call Center 800-328-2255
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
952-937-4515
Please include “Technical Support” in the subject line.
For technical support outside the United States, contact your local sales and
service office. For a list of worldwide sales and service locations and contact
information, use the Global MTS link at the MTS web site:
www.mts.com > Global MTS > (choose your region in the right-hand
column) > (choose the location closest to you)
Before You Contact MTS
MTS can help you more efficiently if you have the following information
available when you contact us for support.
Know your site
number and system
number
The site number contains your company number and identifies your equipment
type (material testing, simulation, and so forth). The number is usually written on
a label on your MTS equipment before the system leaves MTS. If you do not
have or do not know your MTS site number, contact your MTS sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies
which system you are calling about. You can find your job number in the papers
sent to you when you ordered your system.
Example system number: US1.42460
318 Load Unit
Technical Support
7
Know information from
prior technical
assistance
Identify the problem
Know relevant
computer information
Know relevant
software information
8
Technical Support
If you have contacted MTS about this problem before, we can recall your file.
You will need to tell us the:
•
MTS notification number
•
Name of the person who helped you
Describe the problem you are experiencing and know the answers to the
following questions:
•
How long and how often has the problem been occurring?
•
Can you reproduce the problem?
•
Were any hardware or software changes made to the system before the
problem started?
•
What are the model numbers of the suspect equipment?
•
What model controller are you using (if applicable)?
•
What test configuration are you using?
If you are experiencing a computer problem, have the following information
available:
•
Manufacturer’s name and model number
•
Operating software type and service patch information
•
Amount of system memory
•
Amount of free space on the hard drive in which the application resides
•
Current status of hard-drive fragmentation
•
Connection status to a corporate network
For software application problems, have the following information available:
•
The software application’s name, version number, build number, and if
available, software patch number. This information is displayed briefly
when you launch the application, and can typically be found in the “About”
selection in the “Help” menu.
•
It is also helpful if the names of other non-MTS applications that are
running on your computer, such as anti-virus software, screen savers,
keyboard enhancers, print spoolers, and so forth are known and available.
318 Load Unit
If You Contact MTS by Phone
Your call will be registered by a Call Center agent if you are calling within the
United States or Canada. Before connecting you with a technical support
specialist, the agent will ask you for your site number, name, company, company
address, and the phone number where you can normally be reached.
If you are calling about an issue that has already been assigned a notification
number, please provide that number. You will be assigned a unique notification
number about any new issue.
Identify system type
Be prepared to
troubleshoot
Write down relevant
information
After you call
318 Load Unit
To assist the Call Center agent with connecting you to the most qualified
technical support specialist available, identify your system as one of the
following types:
•
Electromechanical materials test system
•
Hydromechanical materials test system
•
Vehicle test system
•
Vehicle component test system
•
Aero test system
Prepare yourself for troubleshooting while on the phone:
•
Call from a telephone when you are close to the system so that you can try
implementing suggestions made over the phone.
•
Have the original operating and application software media available.
•
If you are not familiar with all aspects of the equipment operation, have an
experienced user nearby to assist you.
Prepare yourself in case we need to call you back:
•
Remember to ask for the notification number.
•
Record the name of the person who helped you.
•
Write down any specific instructions to be followed, such as data recording
or performance monitoring.
MTS logs and tracks all calls to ensure that you receive assistance and that action
is taken regarding your problem or request. If you have questions about the status
of your problem or have additional information to report, please contact MTS
again and provide your original notification number.
Technical Support
9
Problem Submittal Form in MTS Manuals
Use the Problem Submittal Form to communicate problems you are experiencing
with your MTS software, hardware, manuals, or service which have not been
resolved to your satisfaction through the technical support process. This form
includes check boxes that allow you to indicate the urgency of your problem and
your expectation of an acceptable response time. We guarantee a timely
response—your feedback is important to us.
The Problem Submittal Form can be accessed:
10
Technical Support
•
In the back of many MTS manuals (postage paid form to be mailed to MTS)
•
www.mts.com > Contact Us > Problem Submittal Form (electronic form to
be e-mailed to MTS)
318 Load Unit
Preface
Before You Begin
Safety first!
Before you attempt to use your MTS product or system, read and understand the
Safety manual and any other safety information provided with your system.
Improper installation, operation, or maintenance of MTS equipment in your test
facility can result in hazardous conditions that can cause severe personal injury or
death and damage to your equipment and specimen. Again, read and understand
the safety information provided with your system before you continue. It is very
important that you remain aware of hazards that apply to your system.
Other MTS manuals
In addition to this manual, you may receive additional MTS manuals in paper or
electronic form.
If you have purchased a test system, it may include an MTS System
Documentation CD. This CD contains an electronic copy of the MTS manuals
that pertain to your test system, including hydraulic and mechanical component
manuals, assembly drawings and parts lists, and operation and preventive
maintenance manuals. Controller and application software manuals are typically
included on the software CD distribution disc(s).
318 Load Unit
Preface
11
Conventions
Conventions
Documentation Conventions
The following paragraphs describe some of the conventions that are used in your
MTS manuals.
Hazard conventions
As necessary, hazard notices may be embedded in this manual. These notices
contain safety information that is specific to the task to be performed. Hazard
notices immediately precede the step or procedure that may lead to an associated
hazard. Read all hazard notices carefully and follow the directions that are given.
Three different levels of hazard notices may appear in your manuals. Following
are examples of all three levels.
Note
For general safety information, see the safety information provided with
your system.
DANGER
Danger notices indicate the presence of a hazard with a high level of risk which,
if ignored, will result in death, severe personal injury, or substantial property
damage.
WARNING
Warning notices indicate the presence of a hazard with a medium level of risk
which, if ignored, can result in death, severe personal injury, or substantial
property damage.
CAUTION
Caution notices indicate the presence of a hazard with a low level of risk which,
if ignored, could cause moderate or minor personal injury, equipment damage, or
endanger test integrity.
Notes
Notes provide additional information about operating your system or highlight
easily overlooked items. For example:
Note
Special terms
Illustrations
Electronic manual
conventions
12
Preface
Resources that are put back on the hardware lists show up at the end of
the list.
The first occurrence of special terms is shown in italics.
Illustrations appear in this manual to clarify text. It is important for you to be
aware that these illustrations are examples only and do not necessarily represent
your actual system configuration, test application, or software.
This manual is available as an electronic document in the Portable Document
File (PDF) format. It can be viewed on any computer that has Adobe Acrobat
Reader installed.
318 Load Unit
Conventions
Hypertext links
318 Load Unit
The electronic document has many hypertext links displayed in a blue font. All
blue words in the body text, along with all contents entries and index page
numbers, are hypertext links. When you click a hypertext link, the application
jumps to the corresponding topic.
Preface
13
Conventions
14
Preface
318 Load Unit
Introduction
Load Unit: Overview
The Load Unit is the primary structure for most materials testing. It is a standalone testing unit. The load unit consists of the load frame plus additional parts,
such as hydraulic crosshead lifts and control modules. Load units come in
different sizes and shapes. The following illustration shows typical load units
with common accessories.
The Load Units are designed for testing materials. They can perform tension and
compression tests, fatigue and fracture mechanics tests, as well as other tests.
MTS manufactures a variety of grips, mounting fixtures, test area guards, and
environmental chambers that can be used with the load unit.
Typical Load Units
Model 318
318 Load Unit
Model 322
Model 359
Introduction
15
What you
need to know
16
Introduction
MTS Systems Corporation assumes that you know how to use your controller.
See the appropriate manual for information about performing any controllerrelated step in this manual’s procedures. You are expected to know how to
perform the following procedures:
•
Turn hydraulic pressure on and off
•
Select a control mode
•
Adjust the actuator position
•
Zero a sensor signal
•
Zero a sensor output
•
Use your grips and fixtures
•
Define a simple test
•
Run a test
318 Load Unit
318 Load Unit: Component Identification
12
2
1
11
3
10
9
4
5
7
8
6
Component Descriptions
ITEM
COMPONENT
DESCRIPTION
1
Crosshead
Moves the up and down the column to accommodate different sized
specimens and fixtures. The crosshead is stiff and light weight; it is one end of
the force train.
2
Crosshead locks
Clamps the crosshead to the columns. The locks are hydraulically powered.
3
Crosshead lifts
Raises and lowers the crosshead hydraulically to accommodate different
specimen sizes. The lifts are small hydraulic actuators.
318 Load Unit
Introduction
17
Component Descriptions
ITEM
COMPONENT
DESCRIPTION
4
Control panel
The Emergency Stop button is standard; the other controls are optional.
Clamps and unclamps the hydraulically controlled grips during specimen
installation and removal.
Grip
controls
Controls the crosshead lifts to raise and lower the crosshead hydraulically.
Crosshea
d lift
control
Removes hydraulic pressure from the load unit and issues an interlock signal
to the controller to stop the test program.
Emergenc
y Stop
5
Servovalve
Controls both the flow rate and the direction of fluid entering the actuators. It
determines how fast the actuator extends or retracts.
6
Isolation pads
Dampens the natural frequency to about 20 Hz. Optional air inflated isolators
dampen the frequency to about 2 Hz.
7
Accumulators
Stores hydraulic fluid under pressure to increase the actuator’s response time.
One accumulator connects to the pressure line; the other to the return line.
8
LVDT
Measures the displacement of the actuator’s travel. The linear variable
displacement transducer (LVDT) is located inside the actuator.
9
Manifold
Serves as the junction point between the hydraulic power unit (HPU),
accumulators, servovalve, and actuator. The actuator manifold controls the
hydraulic circuit that connects the hydraulic components.
10
Linear actuator
Applies axial forces to specimens. The actuator is a hydraulically powered
device that provides linear displacement of (or forces into) a specimen. Grips
and fixtures can be mounted to the actuator.
11
Force transducer
Measures the axial forces applied to specimen.
12
Lifting rings
Allows the load unit to be moved by lifting the entire load unit.
318 Load Unit: Component Description
The load unit is a stand alone testing structure. It consists of the following
components:
18
Introduction
•
Load frame
•
Crosshead lifts and locks
•
Manifold
–
Actuators
–
Servovalves
–
Accumulators
•
Transducers
•
Grip controls
318 Load Unit
Load frame
The load frame is the basic structure which provides the reaction mass for the
force train. The base of the load frame is one end of the reaction mass and the
crosshead is the other end of the reaction mass. Installing a specimen and other
fixtures or components between the load unit base and the crosshead create a
force train.
The load frame and the other hydraulic components mounted to it collectively
create the load unit. The base houses the actuators, servovalves, and hydraulic
manifold. The crosshead is mounted above the base by two columns. A control
panel lets you operate the crosshead lifts, locks, and grips to assist in specimen
installation procedures.
Crosshead lifts
and locks
The crosshead can be positioned anywhere along the load frame columns. It is
moved along the column with hydraulic lifts. When the crosshead is in an
appropriate test position, it is hydraulically clamped to that position. This lets
you change the load unit to test specimens of different lengths.
Actuator manifold
The Series 298 Actuator Manifold (also called a hydraulic service manifold or
HSM) acts as the hydraulic interface between the HPU and the components
mounted to the manifold (actuator, servovalves, and accumulators) of the load
unit. It contains the required hydraulic porting and plumbing to accommodate the
hydraulic components. The manifold can also control the hydraulic pressure to
the load unit.
Actuators
The Series 244 Actuators can be located in the middle of the load unit base or
crosshead. It is a hydraulically powered piston that applies displacement of (or
force into) a specimen. It can apply equal power in tension and compression. One
end of the test specimen is installed into a fixture which is mounted to the end of
the actuator rod.
Servovalves
Accumulators
Pressure control
Transducers
Force
318 Load Unit
The Series 252 Servovalves regulates the direction and flow of the hydraulic
fluid to and from a hydraulic actuator. The servovalve responds to the polarity
and magnitude of the command signal generated by the controller.
The Series 111 Accumulators suppress line-pressure fluctuations. The load unit
includes a pressure-line accumulator to provide fluid storage so a constant line
pressure can be maintained at the servovalves for maximum performance. The
return-line accumulator minimizes return-line pressure fluctuations.
The load unit can be configured for several pressure configurations. The free low
configuration passes the hydraulic pressure from the HPU (or hydraulic service
manifold) through the manifold to the hydraulic components. The hydraulic
pressure options include on/off control, high/low/off control, and high/low/off
control with a proportional valve to ramp the pressure transitions.
The load unit includes a force transducer and an LVDT.
The force transducer (also called load cell or force sensor) measures the amount
of tension or compression and rotational torque applied to it. It has four strain
gages that form a balanced Wheatstone bridge. When forces are applied to the
bridge, it becomes unbalanced and produces an electrical signal that is
proportional to the force applied to it. The force transducer is a resistive device
and requires a DC conditioner to process the axial signal from the Wheatstone
bridge.
Introduction
19
LVDT
The LVDT measures the linear actuator’s travel. The LVDT consists of a
transformer with one primary and two secondary coils wound on a common
cylinder. The coil is stationary inside the actuator. A core is attached to the piston
rod of the actuator. As it moves inside the coil, it produces an electrical signal
that represents the position of the piston rod. The phase of the signal indicates the
direction the actuator rod is moving. An LVDT requires an AC conditioner to
process the signal.
Grip Controls
The grip controls provide independent clamping control of the upper and lower
grips. The maximum pressure for the grip controls can be set up to 69 MPa
(10,000 psi). The pressure is factory set to 20 MPa (3000 psi); 45 MPa (6500
psi); or 69 MPa (10,000 psi) to accommodate a variety of grips manufactured by
MTS Systems Corporation. A front panel control allows the grip pressure to be
adjusted within the factory setting. A rate control sets how fast the grips open and
close.
318 Load Unit: Specifications
This section provides the specifications of the Series 318 Load Unit.
General specifications
The following table lists general specifications for the Series 318 Load Unit:
PARAMETER
SPECIFICATION
Load frame
Lifts
Hydraulic (optional)
Locks
Hydraulic (optional)
Grip control
Hydraulic (optional)
Service manifold
Maximum flow
Axial actuator
Displacements
Accumulator
20
Introduction
Series 298 Actuator Manifold
114 L/min (30 gpm)
Series 244 Actuator
100 mm (4 in)
150 mm (6 in)
250 mm (10 in)
Series 111 Accumulator
318 Load Unit
PARAMETER
SPECIFICATION
Weight*
approximate minimum weight
Base mount
318.10
318.25
318.50
500 kg (1100 lb)
960 kg (2120 lb)
1900 kg (4200 lb)
Crosshead mount
318.10
318.25
318.50
*
Force Ratings
555 kg (1225 lb)
1065 kg (2345 lb)
2100 kg (4625 lb)
The weight specification is for lifting and moving purposes. The weight of
accessories and special fixtures must be added. The actual shipping
weight must be determined by a scale.
The Series 318 Load Units include other products. The following table lists
specifications from several product information manuals. Specifications listed in
the respective product information manual supersede the following
specifications.
MODEL
FRAME
FATIGUE RATING
ACTUATOR
RATING*
TRANSDUCER
RATING
MOUNTING
THREADS
318.10
100 kN
(22 kip)
25 kN
(5.5 kip)
25 kN
(5.5 kip)
M27 x 2
(1 - 14 UNS)
50 kN
(11 kip)
50 kN
(11 kip)
M27 x 2
(1 - 14 UNS)
100 kN
(22 kip)
100 kN
(22 kip)
M27 x 2
(1 - 14 UNS)
100 kN
(22 kip)
100 kN
(22 kip)
M27 x 2
(1 - 14 UNS)
250 kN
(55 kip)
250 kN
(55 kip)
M36 x 2
(1 1/2 - 12 UNF)
250 kN
(55 kip)
250 kN
(55 kip)
M36 x 2
(1 1/2 - 12 UNF)
500 kN
(110 kip)
500 kN
(110 kip)
M52 x 2
(2 -12 UNF)
318.25
250 kN
(55 kip)
318.50
*
500 kN
(110 kip)
At 21 MPa (3000 psi)
Stiffness Data
318 Load Unit
Stiffness is a way to measure the deflection of the force train. Deflection rates can
vary 20%, depending on the actuator and force transducer you use.
Introduction
21
For the most accurate high frequency test results, use a load unit with a fatigue
rating that is larger than its actuator’s force rating.
C
D
B
A
For example, a Model 318.25 Load Unit with a 55 kip fatigue rating and a 22 kip
actuator will have smaller deflections than a Model 318.10 Load Unit with a 22
kip fatigue rating and a 22 kip actuator.
Spring rates are determined at each load unit’s full fatigue rating with its
crosshead raised 1270 mm (50 in.) above the baseplate.
The Stiffness Graph shows how stiffness is affected when the height of the
crosshead is changed.
DEFLECTIONS
MODEL 318.10
100 KN/22 KIP
MODEL 318.25
250 KN/55 KIP
MODEL 318.50
500 KN/110 KIP
A - B base
0.15 mm
0.006 in
0.18 mm
0.007 in
0.20 mm
0.008 in
B - C columns
0.10 mm
0.004 in
0.15 mm
0.006 in
0.18 mm
0.007 in
C - D crosshead
0.13 mm
0.005 in
0.25 mm
0.010 in
0.28 mm
0.011 in
22
Introduction
318 Load Unit
DEFLECTIONS
MODEL 318.10
100 KN/22 KIP
MODEL 318.25
250 KN/55 KIP
MODEL 318.50
500 KN/110 KIP
A - D overall frame
0.38 mm
0.58 mm
0.66 mm
Spring rates
2.6 x 108 N/m
(1.5 x 106 lb/in)
0.015 in
0.023 in
4.3 x 108 N/m
(2.4 x 106 lb/in)
0.026 in
7.5 x 108 N/m
(4.3 x 106 ib/in)
Free Column Length (cm)
25
50
125
250
80
10
45
5
22
318.50
318.10
2
318.25
9
1
4.5
0.5
Maximum Side Load Limits (kN)
Maximum Side Load Limits (kips)
20
10
2
5
10
20
Free Column Length (in)
50
100
Stiffness Graph
318 Load Unit
Introduction
23
Series 661 Force Transducer: Specifications
The force transducer used with this system is a Series 661 Force Transducer. The
following are the specifications for the force transducers.
PARAMETER
SPECIFICATION
Maximum excitation voltage
15 V DC
Bridge resistance
350 ¾
Maximum crosstalk
1.0% of full scale torsional to load
Hysteresis
0.08% of full scale (250 N–2.5 kN)
0.05% of full scale (5 kN–50 kN)
0.15% of full scale (100 kN–500 kN)
0.20% of full scale (1000 kN)
Nonlinearity
0.08% of full scale
0.15% of full scale for Models 661.22/.23/.31
Temperature
0.004% of reading/°C (0.002%/°F)
Usable range
Compensated range
Sensitivity
-54°C (-65°F) to +121°C (+250°F)
+21°C (+70°F) to +77°C (+170°F)
0.0036% of full scale/°C
(0.0020% of full scale/°F)
Output
2 mV/V at full-scale load
Connector
PT02ER-10-6P
MODEL
LOAD CAPACITY
THREAD SIZE*
WEIGHT
661.11-01
250 N
(50 lbf)
M6 x 1.0 mm x 6.3 mm
(1/4 - 28 UNF x 0.25 in
0.45 kg
(1 lb)
661.11-02
500 N
(100 lbf)
M6 x 1.0 mm x 6.3 mm
(1/4 - 28 UNF x 0.5 in
0.45 kg
(1 lb)
661.18-01
1 kN
(220 lbf)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
2.27 kg
(5 lb)
661.18-02
2.5 kN
(550 lbf)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
2.27 kg
(5 lb)
661.19-01
5 kN
(550 lbf)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
3.07 kg
(6.75 lb)
661.19-02
10 kN
(2.2 kip)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
3.07 kg
(6.75 lb)
661.19-03
15 kN
(3.3 kip)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
3.07 kg
(6.75 lb)
661.19-04
25 kN
(5.5 kip)
M12 x 1.25 mm x 25.4 mm
(1/2 - 20 UNF x 1.0 in)
3.07 kg
(6.75 lb)
24
Introduction
318 Load Unit
MODEL
LOAD CAPACITY
THREAD SIZE*
WEIGHT
661.20-01
25 kN
(5.5 kip)
M27 x 2.0 mm x 31.7 mm
(1 - 14 UNS-3B x 1.25 in)
9.75 kg
(21.5 lb)
661.20-02
50 kN
(11 kip)
M27 x 2.0 mm x 31.7 mm
(1 - 14 UNS-3B x 1.25 in)
9.75 kg
(21.5 lb)
661.20-03
100 kN
(2.2 kip)
M27 x 2.0 mm x 31.7 mm
(1 - 14 UNS-3B x 1.25 in)
9.75 kg
(21.5 lb)
661.22-01
250 kN
(3.3 kip)
M36 x 2.0 mm
(1 1/2 - 12 UNC-2B)
13.2 kg
(29 lb)
661.23-01
500 kN
(5.5 kip)
M52 x 2.0 mm x 48.3 mm
(2.0 - 12 UN-2B x 1.9 in)
16 kg
(35.3 lb)
661.31-01
1000 kN
(220 kip)
M76 x 1.75 mm x 28.4 mm
(2.0 - 12 UN-2B x 1.35 in)
49.9 kg
(110 lb)
*
The thread sizes are available with either coarse or fine threads.
Dimensions
The following dimensions are rounded off to the nearest millimeter or eight-inch.
A
C
E
D
B
MODEL
A
B*
C
D*
E
661.11-01
70 mm
(2–3/4 in)
18 mm
(3/4 in)
7 mm
(1/4 in)
38 mm
(1–1/5 in)
61 mm
(2–3/8 in
661.18-01
105 mm
(4–1/4 in)
32 mm
(1–1/4 in)
7 mm
(1/4 in)
67 mm
(2–5/8 in)
64 mm
(2–1/5 in)
661.19-01
105 mm
(4–1/4 in)
32 mm
(1–1/4 in)
7 mm
(1/4 in)
67 mm
(2-5/8 in)
64 mm
(2–1/5 in)
661.20-01
154 mm
(6 in)
57 mm
(2–1/4 in)
10 mm
(3/8 in)
95 mm
(3–3/4n)
89 mm
(3–1/2 in)
661.22-01
114 mm
(4–1/2 in)
92 mm
(3–5/8 in)
1 mm
(>1/4 in)
203 mm
(8 in)
74 mm
(2–7/8 in)
661.23-01
152 mm
(6 in)
140 mm
(5–1/5 in)
N/A
203 mm
(8 in)
86 mm
(3–3/8 in)
661.31-01
222 mm
(8–3/4 in)
203 mm
(8 in)
N/A
305 mm
(12 in)
124 mm
(4–7/8 in)
*
This dimension applies to both ends
318 Load Unit
Introduction
25
26
Weight: 1100 lbs (500 kg) is normal maximum
weight. Accessories and special fixtures
must be added. This weight specification
is for lifting and moving purposes.
Actual shipping weight must be
determined by scale.
Note: Dimensions are inches
(mm)
Standard column lengths indicated
318 Load Unit: Dimensions
318.10B Load Unit Dimensions
Introduction
318 Load Unit
318.25B Load Unit Dimensions
318 Load Unit
Introduction
27
Standard column lengths indicated
Note: Dimensions are inches
(mm)
318.50B Load Unit Dimensions
28
Introduction
318 Load Unit
(mm
Weight: 4200 lbs (1900 kg) is normal
maximum weight. Accessories and
special
fixtures must be added. This weight
specification is for lifting and moving
purposes. Actual shipping weight
Note: Dimensions are
Standard column lengths
318.10B Load Unit with Crosshead Actuator Dimensions
318 Load Unit
Introduction
29
Standard column lengths
(mm
Weight: 1100 lbs (500 kg) is normal
maximum
weight. Accessories and special fixtures
must be added. This weight specification
is for lifting and moving purposes.
Actual shipping weight must be
Note: Dimensions are
Standard 6" (152.5 mm) actuator stroke indicated
318.25B Load Unit with Crosshead Actuator Dimensions
30
Introduction
318 Load Unit
Weight: 2120 lbs (960 kg) is normal maximum
weight. Accessories and special fixtures
must be added. This weight specification
is for lifting and moving purposes.
Actual shipping weight must be
determined by scale.
Note: Dimensions are inches
(mm)
Standard 6" (152.5 mm) actuator stroke indicated
Standard column lengths indicated
318.50B Load Unit with Crosshead Actuator Dimensions
318 Load Unit
Introduction
31
Standard column lengths
(mm
Weight: 4200 lbs (1900 kg) is normal
maximum weight. Accessories and
special
fixtures must be added. This weight
specification is for lifting and moving
purposes. Actual shipping weight
Note: Dimensions are
Standard 6" (152.5 mm) actuator stroke indicated
32
Introduction
318 Load Unit
Safety
General Safety Practices
This section provides information about safety issues that pertain to
servohydraulic systems in general. These issues include statements to the
intended use and foreseeable misuse of the system, the hazard zone, definition for
the graphical hazard labeling that is affixed to your product, and other (more
general) safety information that relates to the high-pressure and highperformance characteristics of MTS servohydraulic systems.
MTS test systems are designed to generate motions and forces and impart these
motions and forces into a test specimen.
When you prepare to operate the system and during system operation, ensure the
following:
318 Load Unit
•
Do not use or allow personnel to operate the system who are not
experienced, trained, or educated in the inherent dangers associated with
high-performance servo hydraulics and who are not experienced, trained, or
educated with regard to the intended operation as it applies to this test
system.
•
Do not disable safety components or features (including limit detectors,
light curtains, or proximity switches/detectors).
•
Do not attempt to operate the system without appropriate personal safety
gear (for example, hearing, hand, and eye protection).
•
Do not apply energy levels that exceed the maximum energies and velocities
for the system design. Refer to the system specifications.
•
Do not test a specimen that exceeds the minimum (if applicable) or
maximum allowable mass. Refer to the system specifications.
•
Do not use specimens that are combustible, flammable, pressurized, or
explosive.
•
Do not use humans as specimens or allow humans to ride in or on the test
specimen or the test system for any purpose unless the system is man-rated
and all associated safety conditions are strictly enforced.
•
Do not modify the system or replace system components using parts that are
not MTS component parts or effect repairs using parts or components that
are not manufactured to MTS specifications.
•
Do not operate the system in an explosive atmosphere.
•
Do not use the system in a test area where uncontrolled access to the test
system is allowed when the system is in operation
•
Do not operate the system unless an interlock is installed to monitor supply
pressure into the HSM and initiate a system interlock if a low or no pressure
event occurs.
Safety
33
If you have system related responsibilities (that is, if you are an operator, service
engineer, or maintenance person), you should study safety information carefully
before you attempt to perform any test system procedure.
You should receive training on this system or a similar system to ensure a
thorough knowledge of your equipment and the safety issues that are associated
with its use. In addition, you should gain an understanding of system functions
by studying the other manuals supplied with your test system. Contact MTS for
information about the content and dates of training classes that are offered.
It is very important that you study the following safety information to ensure that
your facility procedures and the system’s operating environment do not
contribute to or result in a hazardous situation. Remember, you cannot eliminate
all the hazards associated with this system, so you must learn and remain aware
of the hazards that apply to your system at all times. Use these safety guidelines
to help learn and identify hazards so that you can establish appropriate training
and operating procedures and acquire appropriate safety equipment (such as
gloves, goggles, and hearing protection).
Each test system operates within a unique environment which includes the
following known variables:
•
Facility variables (facility variables include the structure, atmosphere, and
utilities)
•
Unauthorized customer modifications to the equipment
•
Operator experience and specialization
•
Test specimens
Because of these variables (and the possibility of others), your system can
operate under unforeseen circumstances that can result in an operating
environment with unknown hazards.
Improper installation, operation, or maintenance of your system can result in
hazardous conditions that can cause death, personal injury, or damage to the
equipment or to the specimen. Common sense and a thorough knowledge of the
system’s operating capabilities can help to determine an appropriate and safe
approach to its operation.
Safety Practices Before System Operation
Before you apply hydraulic power to the test system, review and complete all of
the safety practices that are applicable to your system. The goal, by doing this, is
to improve the safety awareness of all personnel involved with the system and to
maintain, through visual inspections, the integrity of specific system
components.
Read all manuals
34
Safety
Study the contents of this manual and the other manuals provided with your
system before attempting to perform any system function for the first time.
Procedures that seem relatively simple or intuitively obvious can require a
complete understanding of system operation to avoid unsafe or dangerous
situations.
318 Load Unit
Locate and read
hazard placards/labels
Find, read, and follow the hazard placard instructions located on the equipment.
These placards are placed strategically on the equipment to call attention to areas
such as known crush points and electrical voltage hazards.
Locate Lockout/tagout
points
Know where the lockout/tagout point is for all of the supply energies associated
with your system. This includes the hydraulic, pneumatic, electric, and water
supplies (as appropriate) for your system to ensure that the system is isolated
from these energies when required.
Know facility safe
procedures
Most facilities have internal procedures and rules regarding safe practices within
the facility. Be aware of these safe practices and incorporate them into your daily
operation of the system.
Locate Emergency
Stop buttons
Know the location of all the system Emergency Stop buttons so that you can
stop the system quickly in an emergency. Ensure that an Emergency Stop button
is located within 2 meters (6 feet) of the operator at all times.
Know controls
Before you operate the system for the first time, make a trial run through the
operating procedures with the power off. Locate all hardware and software
controls and know what their functions are and what adjustments they require. If
any control function or operating adjustment is not clear, review the applicable
information until you understand it thoroughly.
Have first aid available
Accidents can happen even when you are careful. Arrange your operator
schedules so that a properly trained person is always close by to render first aid.
In addition, ensure that local emergency contact information is posted clearly and
in sight of the system operator.
Know potential crush
and pinch points
Be aware of potential crush and pinch points on your system and keep personnel
and equipment clear of these areas.
Remember, when hydraulic power is interrupted on a servohydraulic system, it is
likely that stored accumulator pressure will persist for some time within the
system. In addition, it is likely that as stored energy dissipates, gravity will cause
portions of the system to move.
Be aware of
component movement
with hydraulics off
The crosshead can slowly drift down the columns if the locks are turned off and
when hydraulic pressure is turned off. The crosshead can damage any test
fixtures, grips, and specimen in its path. Unlock the crosshead only to reposition
it. Always lock the crosshead after you have repositioned it and never leave the
crosshead unlocked.
The actuator rod can also drift down when hydraulics are turned off hitting
anything in its path. This uncommanded movement is because of oil movement
between the pressure/return ports and oil blow by across the piston hub. Be aware
that this can happen and clear the area around the actuator rod when hydraulics
are turned off.
Know electrical
hazards
When the system electrical power is turned on, minimize the potential for
electrical shock hazards. Wear clothing and use tools that are properly insulated
for electrical work. Avoid contact with exposed wiring or switch contacts.
Whenever possible, turn off electrical power when you work on or in proximity
to any electrical system component. Observe the same precautions as those given
for any other high-voltage machinery.
318 Load Unit
Safety
35
Keep bystanders
safely away
Wear proper clothing
Remove flammable
fluids
Know compressed gas
hazards
36
Safety
Keep bystanders at a safe distance from all equipment. Never allow bystanders to
touch specimens or equipment while the test is running.
Do not wear neckties, shop aprons, loose clothing or jewelry, or long hair that
could get caught in equipment and result in an injury. Remove loose clothing or
jewelry and restrain long hair.
Remove flammable fluids from their containers or from components before you
install the container or component. If desired, you can replace the flammable
fluid with a non-flammable fluid to maintain the proper proportion of weight and
balance.
Most servohydraulic systems contain accumulators that require a high-pressure
gas precharge (pressures that exceed 138 bar [2000 psi]). In addition, some
systems can contain devices, such as static supports, that are pneumatically
operated. High-pressure devices are potentially dangerous because a great
amount of energy is available in the event of an uncontrolled expansion or
rupture.
318 Load Unit
Observe the following safety practices when you work with high-pressure air or
gases:
•
When you charge an accumulator, follow all the charging instructions
provided in the appropriate product information manuals. When precharging
accumulators, properly identify the type of gas to be used and the type of
accumulator to be precharged.
Use only dry-pumped nitrogen to precharge nitrogen-charged accumulators.
(Dry-pumped nitrogen can also be labeled “oil pumped” or “dry water
pumped.”) Do not use compressed air or oxygen for precharging: the
temperature increase caused by rapid gas compression can result in highly
explosive conditions when hydraulic fluid is in the presence of oxygen or
compressed air.
•
Always follow the recommended bleeding procedures before you remove or
disassemble components that contain pressurized gas. When you bleed a gas
or remove a fitting, hose, or component that contains a gas, remember that
many gases cannot support life. Therefore, as the ratio of released gas to
oxygen increases, so does the potential for suffocation.
•
Wear appropriate safety devices to protect your hearing. Escaping air or gas
can create a noise level that can damage your hearing.
•
Ensure that all pressurized air or gas is bled out of a pneumatic or gascharged device before you start to disassemble it. A thorough understanding
of the assembly and its pressurized areas is necessary before you undertake
any maintenance. Refer to the appropriate product information for the
correct bleeding procedure.
It might not be obvious or intuitive which bolts or fittings are used to
restrain a pressurized area. On some assemblies, you must remove a cover
plate to gain access to the structural bolts. Sometimes, to protect you from a
rapid release of trapped gases, a small port is exposed when you remove this
cover plate. Exposing this port ensures that the gas precharge is fully bled
before disassembly. However, this is not the recommended procedure for
bleeding a pneumatic or gas-charged device, because it can expose you to
the dangers of escaping compressed gas and particulates that are expelled
from the chamber or around the seals. Do not assume that cover plates and
ports are installed in all the critical locations.
Consult MTS when in doubt about the safety or reliability of any system-related
procedure or modification that involves devices that contain any type of
compressed gas.
Check bolt ratings and
torques
318 Load Unit
To ensure a reliable product, fasteners (such as bolts and tie rods) used in MTSmanufactured systems are torqued to specific requirements. If a fastener is
loosened or the configuration of a component within the system is modified, refer
to the system and component assembly drawings (located on the System
Documentation CD) to determine the correct fastener, fastener rating, and torque.
Overtorquing or undertorquing a fastener can create a hazardous situation due to
the high forces and pressures present in MTS test systems.
Safety
37
On rare occasions, a fastener can fail even when it is correctly installed. Failure
usually occurs during torquing, but it can occur several days later. Failure of a
fastener can result in a high velocity projectile. Therefore, it is a good practice to
avoid stationing personnel in line with or below assemblies that contain large or
long fasteners.
Practice good
housekeeping
Keep the floors in the work area clean. Hydraulic fluid that is spilled on any type
of floor can result in a dangerous, slippery surface. Do not leave tools, fixtures,
or other items not specific to the test, lying about on the floor, system, or decking.
Protect hoses and
cables
Protect electrical cables from spilled hydraulic fluid and from excessive
temperatures that can cause the cables to harden and eventually fail. Ensure that
all cables have appropriate strain relief devices installed at the cable and near the
connector plug. Do not use the connector plug as a strain relief.
Protect all system hoses and cables from sharp or abrasive objects that can cause
the hose or cable to fail. Never walk on hoses or cables or move heavy objects
over them. Consider hydraulic distribution system layout and route hoses and
cables away from areas that expose them to possible damage.
When removing hydraulic hoses for equipment repair or changing testing
components (for example, hydraulic grips), make sure to cap the hose ends to
avoid spilling hydraulic fluid.
Provide proper
hydraulic fluid
filtration.
If the system is equipped with a non-MTS hydraulic power unit, ensure proper
filtration to the hydraulic distribution system and testing components. Particles
present in hydraulic fluid and cause erratic or poor system response.
Protect accumulators
from moving objects.
Protect accumulators with supports or guards. Do not strike accumulators with
moving objects. This could cause the accumulator(s) to separate from the
manifold resulting in equipment damage and personal injury.
Record changes
If you change any operating procedure, write the change and the date of the
change in the appropriate manual.
Provide test area
guards
Use protective guards such as cages, enclosures, and special laboratory layouts
when you work with hazardous test specimens (for example, brittle or
fragmenting materials or materials that are internally pressurized).
Do not exceed the
Maximum Supply
Pressure
For standard MTS systems, ensure that hydraulic supply pressure is limited to a
maximum 21 MPa (3000 psi). If you system has a custom application that
requires higher pressure, make sure you limit supply pressure to that rated for the
custom components.
Do not disable safety
devices
Your system might have active or passive safety devices installed to prevent
system operation if the device indicates an unsafe condition. Do not disable such
devices as it can result in unexpected system motion.
Use appropriately
sized fuses
Whenever you replace fuses for the system or supply, ensure that you use a fuse
that is appropriately sized and correctly installed. Undersized or oversized fuses
can result in cables that overheat and fuses that explode. Either instance creates a
fire hazard.
38
Safety
318 Load Unit
Provide adequate
lighting
Ensure adequate lighting to minimize the chance of operation errors, equipment
damage, and personal injury. You need to see what you are doing.
Provide means to
access out-of-reach
components
Make sure you can access system components that might be out of reach while
standing on the floor. For example ladders or scaffolding might be required to
reach load cell connectors on tall load units.
Ensure equipment is
secure
Make sure the equipment is secure or provide vibration isolation. Some testing
can be performed at resonant frequencies that might cause the equipment to
vibrate and move during testing.
Safety Practices While the System Is in Operation
Wear appropriate
personal protection
Wear eye protection when you work with high-pressure hydraulic fluid,
breakable specimens, or when anything characteristic to the specimen could
break apart.
Wear ear protection when you work near electric motors, pumps, or other devices
that generate high noise levels. Some systems can create sound pressure levels
that exceed 70 dbA during operation.
Wear appropriate personal protection equipment (gloves, boots, suits, respirators)
whenever you work with fluids, chemicals, or powders that can irritate or harm
the skin, respiratory system, or eyes.
Provide test area
guards
Use protective guards such as cages, enclosures, and special laboratory layouts
when you work with hazardous test specimens (for example, brittle or
fragmenting materials or materials that are internally pressurized).
Specimen temperature
changes
During cyclic testing, the specimen temperature can become hot enough to cause
burns. Wear personal protection equipment (gloves) when handling specimens.
Handle chemicals
safely
Whenever you use or handle chemicals (for example, hydraulic fluid, batteries,
contaminated parts, electrical fluids, and maintenance waste), refer to the
appropriate MSDS documentation for that material and determine the appropriate
measures and equipment required to handle and use the chemical safely. Ensure
that the chemical is disposed of appropriately.
Know servohydraulic
system interlocks
Interlock devices should always be used and properly adjusted. Interlock devices
are designed to minimize the chance of accidental damage to the test specimen or
the equipment. Test all interlock devices for proper operation immediately before
a test. Do not disable or bypass any interlock devices as doing so could allow
hydraulic pressure to be applied regardless of the true interlock condition. The
Reset/Override button is a software function that can be used to temporarily
override an interlock while attempting to start the hydraulic power unit and gain
control of the system.
Know system limits
Never rely on system limits such as mechanical limits or software limits to
protect you or any personnel. System limits are designed to minimize the chance
of accidental damage to test specimens or to equipment. Test all limits for proper
operation immediately before a test. Always use these limits and adjust them
properly.
318 Load Unit
Safety
39
Do not disturb sensors
Do not bump, wiggle, adjust, disconnect, or otherwise disturb a sensor (such as
an accelerometer or extensometer) or its connecting cable when hydraulic
pressure is applied.
Ensure secure cables
Do not change any cable connections when electrical power or hydraulic pressure
is applied. If you attempt to change a cable connection while the system is in
operation, an open control loop condition can result. An open control loop
condition can cause a rapid, unexpected system response which can result in
severe personal injury, death, or damage to equipment. Also, ensure that all
cables are connected after you make any changes in the system configuration.
Stay alert
Avoid long periods of work without adequate rest. In addition, avoid long periods
of repetitious, unvarying, or monotonous work because these conditions can
contribute to accidents and hazardous situations. If you are too familiar with the
work environment, it is easy to overlook potential hazards that exist in that
environment.
Contain small leaks
Do not use your fingers or hands to stop small leaks in hydraulic or pneumatic
hoses. Substantial pressures can build up, especially if the hole is small. These
high pressures can cause the oil or gas to penetrate your skin, causing painful and
dangerously infected wounds. Turn off the hydraulic supply and allow the
hydraulic pressure to dissipate before you remove and replace the hose or any
pressurized component.
Stay clear of moving
equipment/avoid crush
points
Stay clear of mechanical linkages, connecting cables, and hoses that move
because you can get pinched, crushed, tangled, or dragged along with the
equipment. High forces generated by the system can pinch, cut, or crush anything
in the path of the equipment and cause serious injury. Stay clear of any potential
crush points. Most test systems can produce sudden, high-force motion. Never
assume that your reactions are fast enough to allow you to escape injury when a
system fails.
Know the causes of
unexpected actuator
motions
The high force and velocity capabilities of MTS actuators can be destructive and
dangerous (especially if actuator motion is unexpected). The most likely causes
of unexpected actuator response are operator error and equipment failure due to
damage or abuse (such as broken, cut, or crushed cables and hoses; shorted wires;
overstressed feedback devices; and damaged components within the servocontrol
loop). Eliminate any condition that could cause unexpected actuator motion.
Do not use RF
transmitters
40
Safety
Keep radio frequency (RF) transmitters away from the workstation computers,
remote terminals, and electronics consoles. Intense RF fields can cause erratic
operation of the more sensitive circuits in the system.
318 Load Unit
Hazard Icons
Following are the hazard icons used on the MTS products.
ICON
DESCRIPTION
Moving parts; pinch points. Keep clear of areas
noted with this label
High pressure fluid or gasses. Do not tamper with
fittings or hoses.
Possible explosive or flying debris. Wear
appropriate protection such as safety goggles and
hearing protection.
Possible tipping hazard. The machine should only
be moved by qualified riggers familiar with moving
heavy, delicate equipment. Once in final operation
position, the frame should be bolted to a suitable
reaction mass.
Alternate possible tipping hazard. The machine
should only be moved by qualified riggers familiar
with moving heavy, delicate equipment. Once in
final operation position, the frame should be bolted
to a suitable reaction mass.
Read the manuals or instructions. Become familiar
with safety information. Also become familiar with
operating and maintenance information.
318 Load Unit
Safety
41
ICON
DESCRIPTION
Alternate read the manuals or instructions. Become
familiar with safety information. Also become
familiar with operating and maintenance
information.
Hot surfaces. Possible burn hazard. Wear personal
protective equipment such as gloves when working
near hot surfaces.
Object is heavy. Requires more that one person to
lift and move.
318 Load Unit: Hazard Labels
This section provides information on hazard labeling. Part numbers are provided
should replacement labels be necessary due to damage.
42
Safety
318 Load Unit
Base Assembly
2
1
1
3
5
4
View A-A
ITEM
PART NUMBER
DESCRIPTION
1
045-384-101
Warning. High force moving parts. Can cause severe injury or
equipment damage.
Stay clear and use eye protection while test is in progress.
Read instructions before operating or servicing.
2
037-588-901
Identification label. Includes model number, part number, serial
number, force capacity, and manufacture date.
3
050-275-301
Information label. No step.
4
050-275-201
Caution. Heavy control panel (up to 15 kg/30 lbs). Can cause
personal injury or equipment damage.
Support control panel until bolts are out. Let down slowly.
5
005-905-101
318 Load Unit
Warning. If lift cylinder line is opened, air may enter causing
crosshead to drop when unlocked. Bleed both cylinders before
unlocking crosshead.
Safety
43
Cylinder Assembly
1
2
ITEM
PART NUMBER
DESCRIPTION
1
037-588-801
Identification label. Includes model number, serial number,
assembly number, force, effective date, static stroke, dyn stroke,
and hydrostatic bearing.
2
038-202-801
Warning. Subjecting this equipment to working pressure above
3000 psi (21 MPa) can result in component rupture and injury to
personnel. See the product manual for safety precautions before
operating.
44
Safety
318 Load Unit
318 Load Unit: Crush Point Hazards
It is important to stay clear of any potential crush points when the system is
operating. Know where the crush points are in your system and protect yourself
and others from those crush points with appropriate safety devices. The
following paragraphs describe crush points and precautions to take while
working around crush points.
647 Hydraulic Wedge Grip
Crush
point
areas
647 Hydraulic Wedge Grip
Locations
A crush point exists between the platen and crosshead on load units where the
actuator piston rod and specimen move (both areas are shown). Another potential
crush point exists where the lower end of the actuator piston rod extends below
the platen and the bottom of the load unit/load frame.
Precautions
Keep clear of any mechanical linkage that moves within a closed area. If the
linkage should move (when the system starts or due to mechanical failure), very
high forces can be present that could pinch, cut, or crush anything in the path of
linkage movement.
Never allow any part of your body to enter the path of machine movement or to
touch moving machinery, linkages, hoses, cables, specimens, etc. These present
serious crush points or pinch points.
318 Load Unit
Safety
45
46
Safety
318 Load Unit
Installation
318 Load Unit: Unpack Upright Configuration
1. Unpack the load unit.
A.
Remove the shipping container (if used).
B.
Remove the protective wrapping around the columns.
C.
Use a clean cloth to wipe the columns clean.
Note
D.
The load unit can be moved by a fork lift as long as the load unit is
attached to its pallet.
Remove the bolts from the wooden beams clamping the load unit to the
pallet.
If you plan on moving the load unit with a fork lift, do not remove the
bolts holding the load unit on the pallet until the load unit has been
moved.
E.
318 Load Unit
Cut the pallet straps.
Installation
47
2. Inspect the load unit for shipping damage.
Look for the following:
•
Scratches in the load unit or lift cylinder columns
•
Damaged electrical connections
•
Damaged hydraulic connections
•
Dents and other structural damage
•
Torn, kinked, or breaking hoses
Report any damage found to both the carrier and MTS. In the U.S. and
Canada, call the MTS HELPLine at 1-800-328-2255. Elsewhere, contact
your local MTS office.
3. Move the load unit to its final location.
Before you move the load unit, check that:
•
The floor where the load unit will sit can bear its weight.
•
The path to where the load unit will sit is clear and uncluttered.
•
The area where the load unit will sit is clean and well lit, with all hoses and
cables moved out of harm’s way.
•
The eyebolts are tight.
•
The crosshead is manually locked.
Lift the load unit only as high as necessary. Move it slowly to its installation
site.
4. Place the load unit onto the isolation pads or airmounts.
48
Installation
•
If your load unit has isolation pads, and the load unit does not sit level,
install stock metal shims between the pads and the floor.
•
If your load unit has airmounts, inflate each airmount in 5 mm (0.20 in)
increments to level the load unit.
–
Check the airmounts’ pressures often to ensure they do not exceed 0.55
MPa (80 psi).
–
Check the airmounts’ inflated heights to make sure that they are all
between 83 and 88 mm (3.25 and 3.5 in).
–
Adjust the air pressure to level the load unit.
318 Load Unit
WARNING
Airmounts can be overinflated and then explode.
You can be seriously hurt if an airmount explodes, sending fragments flying.
Do not overinflate the airmounts.
318 Load Unit: Unpack Horizontal Configuration
Prerequisites
318 Load Unit
The load unit is shipped horizontally on a wooden pallet. You will need the
following equipment to unpack the load unit:
•
Lifting slings—not chains—to lift the load unit from its pallet
•
Rubber mats for the load unit’s feet to rest on
•
Wooden blocks for the load unit’s columns to rest on
•
A knife to cut the packing straps
Installation
49
WARNING
The load unit is extremely heavy.
The weight of the load unit can seriously hurt you and damage your load
unit.
Do not allow the load unit to drop or topple. Observe the following precautions:
•
Ensure that your chains, slings, and crane have a working capacity greater
than the load unit’s weight.
•
Ensure that the lifting eyebolts are tight.
•
Ensure that the crosshead locking bolts are fully tightened.
•
Lift the load unit only high enough to clear its pallet.
•
Operate the crane smoothly to prevent sudden shocks to the sling.
Unpacking the Load Unit
1. Cut the packing straps and remove any bolts as needed. Make sure the
lifting eyebolts are tight.
50
Installation
318 Load Unit
CAUTION
Scratches in the load unit columns can affect how the crosshead performs.
Chains will scratch the columns.
Use slings to lift the load unit from its pallet.
Keep the base steady
Slings at center of gravity
Slide
Rubber mat
Wooden blocks
Removing the Load Unit from Its Pallet
318 Load Unit
Installation
51
2. Inspect the load unit for shipping damage.
Look for the following:
•
Scratches in the load unit or lift cylinder columns
•
Damaged electrical connections
•
Damaged hydraulic connections
•
Dents and other structural damage
•
Torn, kinked, or breaking hoses
Report any damage found to both the carrier and MTS. In the U.S. and
Canada, call the MTS HELPLine at 1-800-328-2255. Elsewhere, contact
your local MTS office.
3. Wrap slings around the columns at the load unit’s balance point.
A.
With someone else steadying the load unit, slightly lift the load unit to
ensure that you have found its balance point. Keep adjusting the slings
and slightly lifting the load unit until you find its balance point.
B.
Lift the load unit just enough to clear its pallet. Slide the pallet out of
the way. Then lower the load unit so that its feet rest on rubber mats
and its columns on the wooden blocks.
4. Lift the load unit upright.
52
Installation
A.
Attach the chains to the lifting eyebolts. Move the crane/forklift to keep
the chains as straight as possible.
B.
Slowly raise the load unit to its upright position. As the unit rises, keep
moving the crane to keep the chains as straight as possible. Do not
exceed a 30° chain angle.
318 Load Unit
C.
Once the load unit is upright, raise it slightly so that the pallet can be
removed.
Crane travel
30° maximum
Bringing the Load Unit Upright
Before you move the load unit, that:
•
The floor where the load unit will sit can bear its weight.
•
The path to where the load unit will sit is clear and uncluttered.
•
The area where the load unit will sit is clean and well lit, with all hoses
and cables moved out of harm’s way.
•
The eyebolts are tight.
•
The crosshead is manually locked.
Lift the load unit only as high as necessary. Move it slowly to its installation
site.
5. Place the load unit onto the isolation pads or airmounts.
•
318 Load Unit
If your load unit has isolation pads, and the load unit does not sit level,
install stock metal shims between the pads and the floor.
Installation
53
•
If your load unit has airmounts, inflate each airmount in 5 mm (0.20 in)
increments to level the load unit.
–
Check the airmounts’ pressures often to ensure that they do not exceed
0.55 MPa (80 psi).
–
Check the airmounts’ inflated heights to ensure that they are all
between 83 and 88 mm (3.25 and 3.5 in).
–
Adjust the air pressure to level the load unit.
WARNING
Airmounts can be overinflated and then explode.
You can be seriously hurt if an airmount explodes, sending fragments flying.
Do not overinflate the airmounts.
Load Unit
83-86 mm
(3.25-3.5 in)
0.55 MPa (80 psi)
maximum pressure
Load Unit
Install
shims
to level
Airmount Foot Support
Isolation Pads
6. Remove the chains.
318 Load Unit: Connect Cables
Your controller manual should have cabling information about the connections
described in this section. Most controller manuals provide the signal pinouts of
the connector, assembly numbers for standard MTS cables, and cable
specifications for cables you may build.
54
Installation
318 Load Unit
Prerequisite
You must have either a cable assembly drawing of your test system, or you must
know the system controller well enough to determine each type of cable
connection.
Ê
Ë
Ì
Í
Î
Ï
1. The force transducer is connected to a DC conditioner in the controller.
2. The ground connection is located on the back of the control panel. This is
usually connected to a chassis ground on a console or the controller chassis.
3. The load unit control panel is connected to the controller. It contains the
emergency stop and crosshead lock signals.
4. The servovalve is connected to a valve driver in the controller.
5. The actuator manifold is connected to the hydraulic service manifold (HSM)
connector on the controller. The actuator manifold may include a
proportional valve or solenoid valves. Controllers can have two connectors
(one for each HSM type) or one connection that may be configured. See
your controller documentation.
6. The displacement sensor (also called an linear variable displacement
transducer or LVDT) is connected to an AC conditioner in the controller.
318 Load Unit
Installation
55
7. Return to the installation procedure.
318 Load Unit: Connect Hydraulics
The procedure describes how to connect the load unit to the hydraulic power
source. The load unit may be connected directly to the hydraulic power unit (also
called HPU), to hydraulic plumbing in the workplace, or through a hydraulic
service manifold.
Note
The internal hydraulic connections from the actuator manifold and
accessories such as the hydraulic lifts and locks should already be
made.
1. Connect the return line from the hydraulic power unit to the hydraulic port
on the manifold labeled “R”.
2. Connect the pressure line from the hydraulic power unit to the hydraulic
port on the manifold labeled “P”.
3. Connect the drain line from the hydraulic power unit to the hydraulic port on
the manifold labeled “D”.
4. Turn on the HPU and check for any hydraulic pressure leaks.
5. Turn on the actuator manifold (also called a hydraulic service manifold or
HSM) and check for hydraulic leaks in the load unit.
6. If you have hydraulic lifts, bleed the air out of the hydraulic lift cylinders.
7. Return to the installation procedure.
318 Load Unit: Unlock the Crosshead
When the load unit is shipped, the crosshead is clamped to the columns with the
manual clamping bolts in the crosshead.
Note
This procedure only applies to load units equipped with hydraulic lifts and
locks.
CAUTION
The crosshead can slowly drift down the columns if the locks are turned off
and when hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it and never leave the crosshead unlocked.
1. Turn on hydraulic pressure.
56
Installation
318 Load Unit
2. Fully loosen the manual crosshead locking bolts in the order shown in the
following figure.
1
2
318.10
136 N·m (100 lbf·ft)
3
1
4
1
318.25
2
3
271 N·m (200 lbf·ft)
4
318.50
271 N·m (200 lbf·ft)
2
Loosening the Manual Lock Bolts
3. Cycle the lock control to unclamp, and then reclamp, the crosshead.
4. Use the lock control to unclamp the crosshead. The unclamped symbol is
shown at the right. Wait 30 seconds for the pressure in the crosshead locks to
drop to zero.
5. Use the lift control to position the crosshead where you want it.
6. Use the lock control to clamp the crosshead to its current position. The
clamped symbol is shown at the right. Wait 30 seconds for the locks to fully
clamp the columns.
318 Load Unit
Installation
57
58
Installation
318 Load Unit
Operation
Load Unit: Operation Preface
This section describes the load unit controls, crush point hazards, and procedures
performed during the normal, day-to-day operation of the load unit.
Application note
Special considerations must be followed when using low force transducers in a
high force systems. Small force transducers are commonly used in larger
systems. You need to be aware that the load unit can produce forces that exceed
the rating of the low force transducer.
CAUTION
Low force transducers in high force systems can be exposed to excessive
forces.
Applying forces that exceed the rated capacity of the force transducer can
damage the transducer.
Ensure that all test commands are within the force transducer’s rating when it is
installed. Your warranty does not cover damage caused by a high force actuator.
MTS recommends the following:
318 Load Unit
•
Position the crosshead so that fixtures cannot touch each other when the
actuator is fully extended. This may not always be feasible at all times, but it
should be practiced whenever possible.
•
Use force limits. Force limits can help in some instances but might not stop
the actuator fast enough in all situations.
•
Ensure that you have selected the correct calibration for the transducer being
used. Also ensure that the system tuning has been optimized for the
transducer being used.
Operation
59
318 Load Unit: Control Module
The controls for the 318 Load Unit are located on a module mounted to the front
of the load unit.
Crosshead Lift / Lock Control
Emergency Stop
Hydraulic Grip Control
Pressure
1
2
3
Rate
Series 318 Load Unit Controls
CONTROL
DESCRIPTION
Hydraulic Grip Controls
Controls the optional hydraulic grips. Hydraulic grips let you quickly and
easily install and remove specimens. The left handle controls the lower grip
and the right handle controls the upper grip.
Unclamp
Clamp
Upper
Grip
Lower
Grip
Adjusts the amount of hydraulic pressure to the grips. The adjustment range is
1–21 MPa (100–3000 psi) or 1–69 MPa (100–10,000 psi). The highest
pressure setting depends on the maximum pressure setting. Adjust the control
clockwise to increase the hydraulic pressure. Use the pressure gage to measure
the clamping force.
Pressure
Pressure
1
2
3
Adjusts how fast the grips clamp and unclamp.
Rate
Adjust the control clockwise to slow the clamping of the specimen.
Rate
60
Operation
318 Load Unit
Series 318 Load Unit Controls
CONTROL
DESCRIPTION
Crosshead Lift/Lock
Controls
Controls the movement and clamping of the crosshead. The left handle raises
and lowers the crosshead. The right handle locks and unlocks the crosshead.
The crosshead must not be moved while it is clamped.
Up
Unlock
Lock
Stop
Down
Emergency Stop
318 Load Unit
Shuts down the hydraulic pressure and stops the test program. Press this button
to shut down hydraulic power, and twist the switch clockwise to release it. Use
the Emergency Stop button to shut down your test if something unexpected
should happen.
Operation
61
318 Load Unit: Crush Point Hazards
It is important to stay clear of any potential crush points when the system is
operating. Know where the crush points are in your system and protect yourself
and others from those crush points with appropriate safety devices. The
following paragraphs describe crush points and precautions to take while
working around crush points.
647 Hydraulic Wedge Grip
Crush
point
areas
647 Hydraulic Wedge Grip
Locations
A crush point exists between the platen and crosshead on load units where the
actuator piston rod and specimen move (both areas are shown). Another potential
crush point exists where the lower end of the actuator piston rod extends below
the platen and the bottom of the load unit/load frame.
Precautions
Keep clear of any mechanical linkage that moves within a closed area. If the
linkage should move (when the system starts or due to mechanical failure), very
high forces can be present that could pinch, cut, or crush anything in the path of
linkage movement.
Never allow any part of your body to enter the path of machine movement or to
touch moving machinery, linkages, hoses, cables, specimens, etc. These present
serious crush points or pinch points.
318 Load Unit: Specimen Installation
The procedure to install a specimen varies due to the variety of test fixtures,
grips, and the type of specimen being installed. This section should be considered
a guideline. You need to modify this procedure to suit your equipment.
62
Operation
318 Load Unit
Prerequisite
You must have the necessary grips and/or fixturing installed. You must also have
the controller set up to control the actuator movement, and you must have a test
program defined.
CAUTION
When changing hydraulic grips, make sure you cap or plug the hydraulic
hoses when removed to prevent oil spillage.
Oil spillage can create an environmental concern and slippery surface that can
cause personal injury. Promptly clean up any oil that might have spilled when
hoses were removed.
WARNING
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Be careful when working in a crush zone. To reduce the hazards in this procedure,
observe the following:
•
Ensure to set and enable displacement interlocks to limit the actuator’s
movement.
•
Ensure that the crosshead is locked.
•
Ensure that the columns are clean and dry.
•
Keep your hands out of the crush zone except when performing the steps
needed to complete this procedure.
1. Prepare the components for specimen installation.
318 Load Unit
A.
Ensure that the crosshead is locked.
B.
Turn on system electrical power.
C.
Turn on high hydraulic pressure.
D.
Use your controller to move the actuator to its start position (usually
mid-displacement). The starting position of the actuator depends on the
type of fixtures, grips, and the test being set up.
Operation
63
CAUTION
The crosshead can slowly drift down the columns if the locks are turned off
and when hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it, and never leave the crosshead unlocked.
2. Set the crosshead position.
The crosshead position depends on the length of the specimen being tested,
the starting position of the actuator, and the size of the fixtures or grips
being used.
3. Install the specimen.
Specimen installation varies according to the type of grip being used. See
the appropriate grip manual for installation instructions. MTS manufactures
a variety of grips:
•
The Series 641 Hydraulic Wedge Grips (hydraulically controlled) are
specifically designed for static or fatigue testing applications. They are
available with a self aligning feature. These are hydraulically
controlled grips.
•
The Series 643.6X Tension/Compression Grips (mechanical) are used
for testing threaded-end and button-end specimens in tension,
compression, or tension/compression.
•
The Series 646 Hydraulic Collet Grips (hydraulically controlled) are
designed to perform in a wide variety of testing applications (for
example, high and low cycle fatigue, tension, and compression).
•
The Series 647 Hydraulic Wedge Grips (hydraulically controlled) are
specifically designed for static or fatigue testing applications. There are
a variety of configurations of this grip.
•
The Series Advantage Wedge Grips are specifically designed for static
or fatigue testing applications. These are a mechanical version of the
Series 647 Hydraulic Wedge Grips.
•
Specialty grips (mechanical) are designed to grip specific types of
material such as string, tread, tendons, etc.
Each type of grip requires the specimen or specimen fixture to fit properly
into the grip. You should always review specimen installation procedures
found in any grip product information manual.
64
Operation
318 Load Unit
CAUTION
Before testing, ensure both grips are clamped and the specimen is secure.
An insufficiently gripped specimen can cause specimen damage, equipment
damage and the possibility of specimen fragmentation.
318 Load Unit: Position the Crosshead Hydraulically
1. This step pressurizes the lift actuators. The crosshead might have shifted
position while hydraulic pressure was turned off.
Briefly turn the Crosshead Lift/Lock Controls to the lift crosshead
position to apply a slight upward pressure to the crosshead.
Then return the lift control to the stop position.
2. Use the Crosshead Lift/Lock Controls to unclamp the crosshead.
Wait 30 seconds for the pressure in the crosshead locks to drop to zero.
Note
Always lower the crosshead to where you want it. The pressure
remaining in the lift cylinders after raising the crosshead can slightly shift
its alignment. Lowering the crosshead to its final position removes this
pressure and improves alignment.
3. Use the Crosshead Lift/Lock Controls to move the crosshead to a point
where you can install the specimen (or specimen fixture) into the upper grip
or fixture without obstruction.
Set the control to the stop position “O” before proceeding.
318 Load Unit
Operation
65
4. Use the Crosshead Lift/Lock Controls to clamp the crosshead to its current
position.
Wait 30 seconds for the locks to fully clamp the columns.
318 Load Unit: Position the Crosshead Manually
This procedure describes how to position a crosshead for a load unit with no
hydraulic crosshead lifts or locks.
WARNING
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Observe the following precautions to reduce the possibility of unexpected
crosshead movement:
•
Ensure that the crosshead is locked.
•
The overhead crane and lifting chains must be able to support the weight of
the crosshead (see the Crosshead Weight table below).
•
Center the crane directly over the load unit.
•
Remove any slack in the lifting chains before unlocking the crosshead.
•
Completely loosen all crosshead locking bolts before attempting to move
the crosshead.
•
Keep the columns clean and dry. The crosshead cannot be securely clamped
to greasy or damp columns.
The following procedure describes using an overhead crane to position the
crosshead. You may use any device that can lift the weight of the load unit.
Model 318.10
Model 318.25
Model 318.50
57 kg (125 lb)
102 kg (225 lb)
193 kg (425 lb)
1. Center the overhead crane directly over the load unit.
2. Attach the lifting chains to the lifting rings. Remove any slack in the lifting
chains while keeping chain tension to a minimum.
66
Operation
318 Load Unit
3. Remove the covers on the ends of the crosshead. The crosshead covers must
be removed to access the manual locking bolts and to clean and lubricate the
bolts. Six 1/4-20 screws (three top, three bottom) on each cover need 5/32
hex (not included). Hand-tighten when reinstalling the covers.
4. Loosen the crosshead locking bolts in 1/4 turn steps (counterclockwise).
The following figure shows the sequence of loosening the crosshead bolts.
3
1
4
318.10
190 N·m (140 lbf·ft)
5
2
6
8
7
3
318.25
4
1
271 N·m (200 lbf·ft)
2
5
6
9
10
7
8
3
1
318.50 rear
271 N·m (200 lbf·ft)
4
2
5
6
11
12
16
15
318.50 front
271 N·m (200 lbf·ft)
14
13
5. Raise or lower the crosshead using the overhead crane.
6. Manually claim the crosshead to lock the crosshead into position.
Manually Clamping the
Crosshead
318 Load Unit
The manual clamping procedure is a four step process. The four steps allow the
crosshead to be clamped evenly.
Operation
67
WARNING
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Observe the following precautions to reduce the possibility of unexpected
crosshead movement:
Prerequisite
•
Ensure that the crosshead is locked.
•
The overhead crane and lifting chains must be able to support the weight of
the crosshead (see the Crosshead Weight table below).
•
Center the crane directly over the load unit.
•
Remove any slack in the lifting chains before unlocking the crosshead.
•
Completely loosen all crosshead locking bolts before attempting to move
the crosshead.
•
Keep the columns clean and dry. The crosshead cannot be securely clamped
to greasy or damp columns.
Before clamping the crosshead in place, you must have determined the proper
crosshead position and moved the crosshead to that position.
CAUTION
The crosshead can slowly drift down the columns if the locks are turned off
and when hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it, and never leave the crosshead unlocked.
Procedure
68
Operation
Tighten the crosshead clamping bolts according to the torque settings shown in
the following table. Torque the crosshead bolts to the values in Step 1 and so on
until Step 4 is complete. Use the same sequence as when you loosened the bolts.
LOAD UNIT
STEP 1
STEP 2
STEP 3
STEP 4*
318.10
20 N·mm
(15 lbf·ft)
171 N·m
(126 lbf·ft)
190 N·m
(140 lbf·ft)
190 N·m
(140 lbf·ft)
318 Load Unit
LOAD UNIT
STEP 1
STEP 2
STEP 3
STEP 4*
318.25
20 N·m
(15 lbf·ft)
244 N·m
(180 lbf·ft)
271 N·m
(200 lbf·ft)
271 N·m
(200 lbf·ft)
318.50
20 N·m
(15 lbf·ft)
244 N·m
(180 lbf·ft)
271 N·m
(200 lbf·ft)
271 N·m
(200 lbf·ft)
*
This step ensures uniform tightness.
318 Load Unit: Adjust the Grips’ Clamp Rate
The clamp rate determines how fast the grip can clamp a specimen.
1. Ensure that both the upper grip control and lower grip control are in the
unclamp position.
2. Turn on electrical power at the test controller.
3. Turn on low or high hydraulic pressure.
4. If needed, move the crosshead or actuator so that the dummy specimen can
be easily installed in the lower grip.
5. Turn the Rate control fully clockwise for the slowest clamp speed.
Rate
Faster
Slower
WARNING
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Be careful when working in a crush zone. Observe the following to reduce the
hazards in this procedure:
318 Load Unit
•
Ensure to set and enable displacement interlocks to limit the actuator’s
movement.
•
Ensure that the crosshead is locked.
•
Ensure that the columns are clean and dry.
•
Keep your hands out of the crush zone except when performing the steps
needed to complete this procedure.
Operation
69
6. Fully install the dummy specimen in the lower grip.
7. Cycle the lower grip control between the clamp and unclamp positions to
clamp and unclamp the specimen.
A.
Clamp
Unclamp
Watch the speed at which the lower grip clamps and unclamps the
specimen.
B.
Adjust the Rate control counterclockwise for the desired speed.
318 Load Unit: Adjust the Grips’ Clamp Force
The Pressure control adjusts the hydraulic pressure applied to the grips. The
Rate control adjusts the grips’ clamping speed. They must be adjusted before the
grips can be used.
The amount of hydraulic pressure applied depends on the type of grips you are
using and what you are gripping. Use your grip manual to determine the correct
hydraulic pressure before adjusting the force. Experiment with a dummy
specimen to find the best setting.
Note
The Pressure control can adjust the grip pressure up to the maximum
output pressure setting (which is initially set by MTS Systems
Corporation).
1. Ensure that both the upper grip control and lower grip control are in the
unclamp position.
2. Turn on the electrical power at the test controller.
3. Turn on low or high hydraulic pressure.
4. If needed, move the crosshead or actuator so that the dummy specimen can
be easily installed in the lower grip.
CAUTION
Grips are designed to operate within a range of hydraulic pressure.
Too much pressure can damage both the grips and the specimen.
Do not adjust grip pressure higher than the grip rating. See your grip manual to
determine the correct hydraulic pressure to apply to your grips before adjusting
the Pressure control.
70
Operation
318 Load Unit
5. Adjust the Pressure control for the desired hydraulic pressure.
Pressure
More
Less
6. If you exceed the desired pressure setting, adjust the Pressure control
counterclockwise 1/2 turn. If pressure setting exceeds 20 MPa (3000 psi)
cycle (clamp and unclamp) one of the grips. Return to Step 5.
318 Load Unit
Operation
71
72
Operation
318 Load Unit
Maintenance
318 Load Unit: Maintenance Intervals
318 Load Unit: Daily Inspections
318 Load Unit: Clean the Columns
318 Load Unit: Prevent Rust
77
78
78
79
318 Load Unit: Maintain Airmount Pressures
80
318 Load Unit: Bleed the Hydraulic Lift Cylinders
318 Load Unit: Adjust the Hydraulic Locks
81
83
318 Load Unit: Lubricate the Crosshead Locking Bolts
318 Load Unit: Align the Force Transducer
111 Accumulator: Maintenance Overview
86
87
93
111 Accumulator: Check and Change Precharge Pressure
244 Actuator: Maintenance
298 HSM: Maintenance
98
98
252 Servovalve: Maintenance Overview
318 Load Unit
94
100
252 Servovalve: Replace the Filter Element
100
252 Servovalve: Adjust the Mechanical Null
102
Maintenance
73
Routine Maintenance Overview Checklist
Routine Maintenance Overview Checklist
Recommended service to be performed at each running time interval noted
CALENDAR TIME USING 8 HOUR RUNNING TIME RATE
DAILY WEEKLY
BIWEEKLY
RUNNING TIME-HOURS
8
80
Check Actuator Platen Area to be Clean
X*
Monitor Filter Indicators
X
ANNUALLY
PER DAY
40
Check Hoses/Cables/Connectors
X
Check Crosshead/Lifts/Supports
X
Check Actuator to be Dry
X
Check Hydraulic Service Manifold
X
Check Lift Seal Condition to be Dry
X
Check Lock Seal Condition to be Dry
X
Bionix Lubricate Axial/Torsional Spline
(75-100 hrs)
X
Check Actuator
X
500
1000
1,500 2,000
Crosshead/Load Frame
Check Crosshead/Lifts/Supports
MTS †
MTS
MTS
MTS
MTS
Lift Seal Condition is Dry
MTS
MTS
MTS
MTS
MTS
Lock Seal Condition is Dry
MTS
MTS
MTS
MTS
MTS
Crosshead Columns are Clean
MTS
MTS
MTS
MTS
MTS
Column Abrasions are Acceptable
MTS
MTS
MTS
MTS
MTS
Crosshead Speed is Appropriate
MTS
MTS
MTS
MTS
MTS
Crosshead Unlock Causes Program
Interlock
MTS
MTS
MTS
MTS
MTS
Load frame Support Airbags/Pads
MTS
MTS
MTS
MTS
MTS
Crosshead Movement is Smooth
MTS
MTS
MTS
MTS
MTS
Hydraulic Crosshead Locks are
Functioning Properly
MTS
MTS
Bleed Crosshead Lift Cylinders
MTS
MTS
Lubricate Manual Crosshead Lock Bolts
MTS
Actuator
Cursory Check of Actuator
74
Maintenance
MTS
MTS
MTS
MTS
318 Load Unit
Routine Maintenance Overview Checklist
Recommended service to be performed at each running time interval noted
CALENDAR TIME USING 8 HOUR RUNNING TIME RATE
DAILY WEEKLY
BIWEEKLY
8
80
ANNUALLY
PER DAY
RUNNING TIME-HOURS
40
500
1000
1,500 2,000
Actuator Area is Dry
MTS
MTS
MTS
MTS
Actuator Platen Area is Clean
MTS
MTS
MTS
MTS
Piston Rod Wear is Acceptable
MTS
MTS
MTS
MTS
Bionix Lubricate Axial/Torsional Spline
(75-100 hrs)
MTS
MTS
MTS
MTS
Cursory Check of Hydraulic Service
Manifold
MTS
MTS
MTS
MTS
Monitor Filter Indicators
MTS
MTS
MTS
MTS
Manifold Hose Connections are Tight
MTS
MTS
MTS
MTS
Accumulator Connections are Dry
MTS
MTS
MTS
MTS
Accumulator Connections are Tight
MTS
MTS
MTS
MTS
Accumulator Caps/Guards are Present
MTS
MTS
MTS
MTS
Oil on the Gas Side of the Piston
MTS
MTS
MTS
MTS
Check and Adjust Pressure in
Accumulator
MTS
MTS
MTS
MTS
Hydraulic Service Manifold
Change Filters
MTS
Low Pressure Adjustment (Model 294)
MTS
Hoses/Cables
Cursory Check of Hoses/Cables/
Connectors
MTS
MTS
MTS
MTS
Absence of Hose Abrasions, Blisters,
Vulcanizing
MTS
MTS
MTS
MTS
Cable Condition and Routing is
Acceptable
MTS
MTS
MTS
MTS
Check Transducer Connections
MTS
MTS
MTS
MTS
Hose Connections and Crimps are Dry
MTS
MTS
MTS
MTS
Overall System Condition is Acceptable to
Use
MTS
MTS
MTS
MTS
Turning Parameters are Appropriate/
System Stable
MTS
MTS
MTS
MTS
E-Stop is Working if Applicable
MTS
MTS
MTS
MTS
Complete System
318 Load Unit
Maintenance
75
Routine Maintenance Overview Checklist
Recommended service to be performed at each running time interval noted
CALENDAR TIME USING 8 HOUR RUNNING TIME RATE
DAILY WEEKLY
BIWEEKLY
8
80
ANNUALLY
PER DAY
RUNNING TIME-HOURS
40
500
1000
1,500 2,000
Response to Full Stroke Waveform, Visual
and Audible
MTS
MTS
MTS
MTS
Valve Balance check displacement control
MTS
MTS
MTS
MTS
Valve Dither Response
MTS
MTS
MTS
MTS
Cursory Check of Grips/Grip Control
MTS
MTS
MTS
MTS
Grip Supply Connections are Dry
MTS
MTS
MTS
MTS
Grip Seals are Dry
MTS
MTS
MTS
MTS
Grip Action is Acceptable
MTS
MTS
MTS
MTS
Lubricate Grip Inserts
MTS
MTS
MTS
MTS
Grips
*Symbol denotes services performed by equipment operators. Most of these procedures involve visual checks that
should not interfere with test system operation. These checks are also completed by trained field service
engineers on each Routine Maintenance visit.
†Symbol denotes service performed by trained field service engineers as part of an MTS Routine Maintenance
plan. Some of these procedures require special service tools and/or specific service training to complete.
76
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
318 Load Unit: Maintenance Intervals
The following table lists the recommended interval for each of these procedures.
318 Load Unit
WHAT TO DO
WHEN TO DO IT
Make daily inspections
Before the start of each day’s
testing.
Clean the load unit columns
When the columns become greasy
or dirty.
Prevent rust
Depends on the operating
environment; more often in humid
environments.
Maintain airmount pressures
When the load unit sits unevenly.
Bleed the hydraulic lift cylinders
When the crosshead begins to
move roughly; if the sealed side of
the hydraulic supply is opened to
air.
Adjust the hydraulic locks
When the crosshead sticks or
moves jerkily on the column.
Lubricate the Crosshead
Locking Bolts
Whenever they begin to be hard to
tighten or sticky when loosened.
Lubricate the crosshead locking
bolts
When the bolts begin to loosen or
tighten stiffly (manual locking
crossheads only).
Align the force transducer
After actuator or force transducer
installation; when a better
alignment between the two is
desired.
Check the accumulators’
precharge pressures. Adjust if
necessary
At least once a month; more often
as required by operating
conditions.
Clean exposed actuator piston
rod
Weekly; more often as required by
operating conditions.
Change 298 HSM filter.
When indicator is in bypass
position or when hydraulic fluid is
changed.
Perform 252 Servovalve
maintenance: change filter.
When servovalve performance has
deteriorated.
Perform 252 Servovalve
maintenance: adjust mechanical
null.
After the valve balancing
procedure (electrical
compensation) has been completed
and the results are judged
unsatisfactory.
Maintenance
77
Routine Maintenance Overview Checklist
318 Load Unit: Daily Inspections
Before the start of each day’s testing, do a quick inspection of your load unit.
Following are typical things that should be checked daily:
•
Ensure that there are no leaks from lifts or locks.
•
Ensure that there are no leaks from the actuator, hydraulic service manifold,
servovalve, or accumulators.
•
Ensure that electrical connections are tight, with no frayed or poorly routed
cables.
•
Ensure that hoses are routed properly and fittings are not leaking.
318 Load Unit: Clean the Columns
The crosshead locks can not securely clamp the crosshead to dirty or greasy
columns. You will need #1 grade kerosene and lint-free cloths to perform this
procedure.
WARNING
The crosshead can slide down the columns.
Crosshead cleaning takes place in a crush zone where pinched fingers and
crushed hands can occur.
Do not position yourself in a crush zone. Always lock the crosshead after moving
it. Always turn off hydraulic pressure before cleaning the columns. Wait two
minutes for pressure to bleed off before starting work.
1. Ensure that the crosshead is locked.
2. Using a clean, lint-free cloth, clean the exposed surfaces of the columns
with #1 grade kerosene.
3. If your load unit does not have hydraulic crosshead lifts, skip ahead to the
next step. If your load unit has hydraulic crosshead lifts, complete the
following steps:
A.
Turn on system electrical power.
B.
Apply high hydraulic pressure to the load unit.
4. If there is a specimen in the load unit, remove it.
5. Unlock and move the crosshead to expose the uncleaned section of the
columns.
6. Lock the crosshead.
7. If hydraulic pressure has been turned on, turn it off. Wait two minutes for the
pressure to bleed off before going on to the next step.
8. Clean the remaining sections of the columns.
78
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
318 Load Unit: Prevent Rust
Where you operate the load unit determines how often you take rust prevention
measures. Humid and corrosive environments require more prevention.
Recommended
supplies:
•
#1 grade kerosene
•
Silicone spray
•
000 emery cloth
•
Touchup paint
•
Metal primer paint
•
Lint-free cloths
WARNING
The crosshead can slip if the columns are still damp with kerosene.
You can be hurt and your equipment damaged.
The crosshead locks cannot securely clamp on damp columns. Wait until the
columns are dry to the touch before moving and locking the crosshead.
Chrome plated surfaces: For microscratches,
wipe with a clean, lint-free cloth dampened
with #1 kerosene. For rust discoloration,
polish with a very fine emery cloth, and then
wipe down.
Unpainted surfaces: Spray with silicone, and
then wipe with a clean, lint-free cloth. Or,
wipe with a clean, lint-free cloth dampened
with clean hydraulic fluid.
Painted surfaces: For small scratches, use
touchup paint. For large scratches, sand,
prime, and use touchup paint.
Black oxide surfaces: Spray with silicone, and
then wipe with a clean, lint-free cloth. Or, wipe
with a clean, lint-free cloth dampened with
clean hydraulic fluid.
318 Load Unit
Maintenance
79
Routine Maintenance Overview Checklist
318 Load Unit: Maintain Airmount Pressures
Optional inflatable airmounts reduce vibration and noise. They are installed
under the feet of the load unit. Inflation pressures must be maintained to both
level and isolate the load unit.
WARNING
Airmounts can be overinflated and then explode.
You can be seriously hurt if an airmount explodes, sending fragments flying.
Do not overinflate the airmounts.
1. Check the inflation pressures on each airmount. Bleed any airmount whose
pressure is above 0.55 MPa (80 psi).
2. Check the airmounts’ inflated heights. They should be between
83–86 mm (3.25–3.5 in).
If the load unit is level and the airmount heights correct, you are done.
If not, continue this procedure.
5 mm (0.20 in) steps
83–86 mm
(3.25–3.5 in)
0.55 MPa
(80 psi)
Maximum pressure
3. Gradually inflate or deflate each airmount in 5 mm (0.20 in) steps as
required to level the load unit.
Ensure that airmount pressures do not rise above 0.55 MPa (80 psi) and
heights do not rise above 86 mm (3.5 in).
4. After leveling the load unit, check that the height of each airmount is
between 83–86 mm (3.25–3.5 in).
5. If any airmount pressures are above 80 psi (0.55 MPa) or any airmount
heights not between 83–86 mm (3.25–3.5 in), repeat Steps 1–3 until the load
unit is level.
80
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
318 Load Unit: Bleed the Hydraulic Lift Cylinders
Bleed both hydraulic lift cylinders whenever the crosshead does not move
smoothly. Also bleed them whenever the sealed side of the hydraulic system has
been opened to air. The following figure shows the location of the bleed ports for
the two types of lifts commonly used.
Bleed ports
318 Load Unit
Maintenance
81
Routine Maintenance Overview Checklist
CAUTION
The crosshead can slowly drift down the columns if the locks are turned off
and the hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it, and never leave the crosshead unlocked.
1. Make sure your crosshead is locked.
2. Turn on system electrical power.
3. Reset any active interlocks at the test controller.
4. Turn on high hydraulic pressure.
5. If there is a specimen in the load unit, remove it.
WARNING
The lifts contain hydraulic fluid under high pressure.
If the bleed port screw is unscrewed all the way, the screw can fly out of its
port at high velocity and it could hurt you or damage your equipment.
Unscrew the bleed port screw no more than 1/2 turn to vent the trapped air.
1/2 turn maximum
Open to Bleed
6. Use a 1/8 inch hex key (or slotted screwdriver, depending on model number)
to open one of the bleed ports. Do not unscrew the bleed port screw more
than 1/2 turn.
82
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
7. Briefly turn the Lift Control to the lift crosshead position to pressurize the
lift cylinders. Then return it to the stop crosshead position.
No bubbles
Close
8. Shut the bleed port when bubble-free fluid begins oozing out. If necessary,
again pressurize the lift cylinders to force all the air out.
9. Repeat Step 6 through Step 8 to bleed the air out of the other lift cylinder.
Note
If fluid continues to leak out of a shut bleed port, turn off hydraulic
pressure to the load unit. Let the pressure in the lift cylinders return to
zero. Then replace both bleed port screws (MTS par number
010-037-601).
10. Turn on high hydraulic pressure. If pressure was reduced at the hydraulic
power unit, restore full pressure.
11. Briefly turn the Lift Control to the lift crosshead position to pressurize the
lift cylinders. Then return it to the stop crosshead position.
12. Unlock the crosshead and exercise the crosshead. Then return to the stop
crosshead position. Raise and lower the crosshead to check for smooth
operation. Lock the crosshead.
13. If the crosshead does not move smoothly, go back to Step 4 and continue
from there.
318 Load Unit: Adjust the Hydraulic Locks
Hydraulic locks might need adjustment if the crosshead still moves jerkily after
bleeding the lift cylinders. Adjustment might also be needed if the crosshead
slips under full load.
If adjusting the hydraulic locks does not fix these problems, call MTS.
1. Turn on electrical power at the controller. Do not turn on hydraulic pressure
yet.
2. If the crosshead is already at a comfortable working level with no specimen
installed, proceed to Step 3.
If not, position the crosshead for a comfortable working level. Proceed as
follows:
A.
318 Load Unit
Reset any active interlocks at the test controller.
Maintenance
83
Routine Maintenance Overview Checklist
B.
Turn on high hydraulic pressure.
C.
If there is a specimen in the load unit, remove it.
D.
Move the crosshead to a comfortable working height.
CAUTION
The crosshead can slowly drift down the columns if the locks are turned off
and the hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it, and never leave the crosshead unlocked.
3. Remove the covers on the ends of the crosshead. The crosshead covers must
be removed to adjust the hydraulic locks. Four 1/4-20 screws (two top, two
bottom) on each cover need 5/21 hex (not included). Hand-tighten when
reinstalling the covers.
1
2
318.10
136 N·m (100 lbf·ft)
3
1
84
Maintenance
4
1
318.25
2
3
271 N·m (200 lbf·ft)
4
318.50
271 N·m (200 lbf·ft)
2
318 Load Unit
Routine Maintenance Overview Checklist
4. Use the Lock Control to lock the crosshead. Then torque the manual
crosshead locking bolts in the order shown in the following illustration.
5. Turn off hydraulic pressure.
6. Use the Lock Control to the unlock crosshead position to remove pressure
from the hydraulic locks. Wait two minutes for the pressure in the locks to
drop to zero before going on to the next step.
7. Tighten each lock’s cap screw until its piston bottoms out. Then loosen and
hand-tighten each cap screw.
Tighten
Bottom out
position
Loosen, then
hand tighten
8. Loosen each of the hydraulic locks’ cap screws 1/4 turn.
Loosen1/4 turn
9. Turn on electrical power at the test controller if you have not already done
so.
10. Reset any active interlocks at the test controller.
11. Turn on high hydraulic pressure.
12. Return the Lock Control to the lock crosshead position to pressurize the
hydraulic locks.
13. Fully loosen the manual crosshead locking bolts. Then turn the Lock
Control to the unlock crosshead position.
318 Load Unit
Maintenance
85
Routine Maintenance Overview Checklist
14. Move the crosshead, locking and unlocking it, to check for smooth
operation.
318 Load Unit: Lubricate the Crosshead Locking Bolts
Lubricate the locking bolts in a manually locked crosshead whenever they begin
to be hard to tighten or sticky when loosened.
1. Remove the covers on the ends of the crosshead. The crosshead covers must
be removed to lubricate the crosshead locking bolts. Four 1/4-20 screws
(two top, two bottom) on each cover need 5/21 hex (not included). Hand
tighten when reinstalling the covers.
2. Position the crosshead at a comfortable working height.
Unscrew one
at a time
Clean and
lubricate
3. Lock the crosshead following your normal crosshead locking procedure.
4. Remove a single locking bolt.
5. Clean the bolt threads with a stiff nylon brush. Use degreaser if necessary.
Dry the threads.
Then lightly lubricate the threads with Molykote® G-n paste.
6. Reinstall the locking bolt, tightening it to a value specified in the following
table.
LOAD UNIT
TORQUE
318.10
190 N·m (140 lbf·ft)
318.25
271 N·m (200 lbf·ft)
318.50
271 N·m (200 lbf·ft)
7. Repeat Steps 4 and 5 until all the bolts have been lubricated.
86
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
318 Load Unit: Align the Force Transducer
This section describes how to align a force transducer with the load unit actuator.
The load units shown may vary from what you may have.
The 318.10 and some 318.25 Load Units come with two types of transducer
mounting hardware. One preloads the force transducer with a hex nut; the other
uses a preloader collar with jackbolts or captive set screws.
The 318.50 and some 318.25 Load Units use a preloader collar with six or eight
internal jackbolts to preload the force transducer.
Required equipment
Identification
plate
•
Torque wrench with a 5–135 N·m (5–100 lbf·ft) range
•
Molykote G·n paste
•
Rubber mallet
•
0.0025 mm (0.0001 in) precision dial indicator with a magnetic base
Preloaded collar
Stud
Hex nut
Identification plate
Washer
Washer
Adapter bushing
Stud
Crosshead
Transducer
(appearance
can vary)
The identification plate specifies the final torque value.
Hex Nut Preloading Hardware Preloader Collar Hardware
1. Get things ready.
A.
If grips are installed, remove them.
B.
Turn on system electrical power.
C.
Turn on high hydraulic pressure.
2. Set up the load unit.
318 Load Unit
Maintenance
87
Routine Maintenance Overview Checklist
A.
Position the actuator at midstroke.
B.
Set and enable the test controller’s upper and lower limit detect
interlocks to limit the actuator’s movement to 2 mm (0.10 in) in each
direction.
C.
Move the crosshead so there is about 360 mm (14 in) between the top
of the actuator and the bottom of the force transducer.
D.
Lock the crosshead.
WARNING
Alignment takes place in a crush zone with hydraulic pressure on.
Hands can be crushed and equipment can be damaged equipment when
hydraulics are turned on. Be careful when working in a crush zone.
Observe the following to reduce the hazards in this procedure:
•
Ensure that you set and enable displacement interlocks to limit the
actuator’s movement.
•
Ensure that the crosshead is locked.
•
Reduce the load unit’s hydraulic pressure to low.
•
Keep your hands out of the crush zone except when performing the steps
needed to complete this procedure.
E.
Turn the load unit’s hydraulic pressure to high.
Unscrew/Tighten
F.
88
Maintenance
If your load unit has an antirotate actuator, unscrew the four cap screws
that attach the antirotate plate to the bottom of the piston. The antirotate
plate is at the bottom of the actuator, inside the base of the load unit.
318 Load Unit
Routine Maintenance Overview Checklist
3. Check the alignment.
In this step, you check the alignment between the force transducer and the
actuator.
.
Read
along
the edge
Zero
Read
along
the edge
Zero
360°
360°
Attaching and Zeroing the Indicator
A.
Attach the dial indicator to the actuator.
On a low profile force transducer, adjust the indicator to take the
reading along the edge of the loading surface.
On cylindrical style force transducers, adjust the indicator so that its
stylus just touches the polished bottom edge of the transducer.
B.
Zero the indicator.
C.
Slowly turn the actuator to rotate the indicator 360° around the force
transducer.
Stop frequently to take indicator readings. Keep your hands off the
actuator and indicator when taking the readings. Compute the total
indicator runout (TIR). Take the maximum dial indicator reading and
subtract the minimum dial indicator reading.
LOAD UNIT RATING
TIR
250 kN (55 kip) or less
>0.038 mm (0.0015 in)
500 kN (100 kip)
0.051 mm (0.0020 in)
D.
If the TIR is 0.038 mm (0.0015 in) or less, the force transducer is
accurately aligned with the actuator. Go to Step 6.
If the TIR is greater than 0.038 mm (0.0015 in), the force transducer
needs to be aligned with the actuator. Start over with Step 3.
318 Load Unit
Maintenance
89
Routine Maintenance Overview Checklist
4. Prepare the force transducer.
Depending on the type of force transducer you have, perform one of the
following procedures:
Hex nut mount only
•
Hex nut mount only
•
Preloader collar mount only
The following procedure applies only to force transducers that are mounted
to the crosshead with a single hex nut.
A.
Put blocks of wood between the actuator and the force transducer. They
will support the force transducer when its mounting nut is loosened.
B.
Loosen the mounting nut. Lubricate the exposed stud threads and
washer with Molykote G·n paste.
C.
Tighten the mounting nut just enough to pull the force transducer
firmly against the crosshead.
D.
Remove the wood blocks. Reinstall and zero the indicator.
Tighten
G-n paste
Wooden
blocks
Lubricating the Hex Nut
90
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
Preloader collar mount
only
The following procedure applies only to force transducers that are mounted
to the crosshead using a preload collar.
Loosen the six jack bolts or setscrews in 1/4 turn steps to remove most of the
tension on the preloader collar, following a standard crisscross torque
sequence.
•
If your preloader collar has jackbolts, remove and lubricate them one at a
time. Lubricate the washer underneath the jackbolt. After you reinstall the
jackbolt, tighten it enough to keep the force transducer pulled firmly against
the crosshead.
•
If your preloader collar has captive setscrews, unscrew them one at a time.
Lubricate the washer underneath the setscrew. Then retighten the setscrew
just enough to keep the force transducer pulled firmly against the crosshead.
1
6
4
3
5
2
Remove, one at a time
G-n paste
Preloader Collar Bolts
5. Align the force transducer.
This step describes how to align a force transducer to the crosshead.
A.
318 Load Unit
Lightly tap the transducer with the rubber mallet to change its position
until you get a TIR of 0.038 mm (0.0015 in) or less.
Maintenance
91
Routine Maintenance Overview Checklist
B.
Tighten to 5% of the torque recorded on the identification plate.
Hex nut—Tighten the nut to 5% of the final torque shown on the
identification plate.
Preloader collar—Tighten the jackbolts or setscrews to 5% of the
final torque shown on the identification plate.
1
C.
Rotate the indicator to see if the TIR is still 0.038 mm (0.0015 in) or
less. If not, loosen the nut or preloader collar and return to Step 4.
(Loosen the preloader collar following the sequence shown below.)
D.
Repeat Steps B and C to tighten the force transducer for the following
torque progression: 50%, 75%, and 100%.
1
6
4
3
5
8
4
6
5
2
3
7
2
Bolt Torque Sequence
E.
Preloader collar only—For uniform tightness, retorque the jackbolts
or setscrews to 100% of the final torque shown on the identification
plate.
6. Finish the procedure.
In this step, you complete the force transducer alignment procedure.
92
Maintenance
A.
Remove the dial indicator.
B.
If you reduced pressure at the hydraulic power unit, restore full
hydraulic pressure.
318 Load Unit
Routine Maintenance Overview Checklist
C.
Turn the load unit’s hydraulic pressure to off.
Unscrew/Tighten
Anti-Rotate Actuator—Tightening the Cap Screws
D.
If your load unit has an antirotate actuator, tighten the four antirotate
cap screws to a torque listed in the following table. (The actuator force
rating is stated on an identification plate at the rear of the load unit.)
ACTUATOR FORCE RATING
TORQUE RATING
25 kN (5.5 kip)
3.7 N·m (2.7 lbf·ft)
11–500 kN (11–110 kip)
48 N·m (35 lb·ft)
111 Accumulator: Maintenance Overview
Maintaining the proper pressure level for your accumulators is essential for
optimum system performance and component life. Review the following figure
to familiarize yourself with the accumulator components and their locations.
Also review the following guidelines before performing any procedure.
318 Load Unit
Maintenance
93
Routine Maintenance Overview Checklist
Use the following guidelines to determine when maintenance is required.
•
Check the precharge pressure at periodic intervals. The length of time
between checks depends on how the system is used. Some factors to
consider when establishing this time interval are operating frequency,
displacement, and duration. Start with one month intervals until you
determine another interval is more appropriate.
•
Maintain a log book on the condition of the precharge at each check. Use
this data to determine if the time between checks should be increased or
decreased and if maintenance is required.
•
Because the precharge pressure level varies with a temperature change, the
level should always be checked at the same temperature. If it is not, use one
of the following formulas to determine if the precharge level is acceptable.
Degrees Celsius:
273 + ( current temperatrure )
current pressure = original pressure × ⎛ ---------------------------------------------------------------------⎞
⎝ 273 + ( original temperature )⎠
Degrees Fahrenheit:
460 + ( current temperatrure )
current pressure = original pressure × ⎛ ---------------------------------------------------------------------⎞
⎝ 460 + ( original temperature )⎠
•
If a pressure line accumulator has a pressure level change of ±1.4 MPa (200
psi) between checks, the accumulator requires maintenance or the time
interval between checks needs to be shortened.
•
If a return line accumulator has a change of ±50% of the original pressure
level between checks, the accumulator requires maintenance or the time
interval between checks needs to be shortened.
•
If the precharge pressure level increases at each check interval, this indicates
that fluid is collecting on the gas side (a small amount of fluid leakage is
normal). When the precharge pressure level cannot be maintained within the
limits, remove the fluid and charge the accumulator. If the levels are again
exceeded at the first check interval, replace the piston seals after the initial
fluid has been changed.
•
If the precharge pressure level decreases at each check interval, this
indicates gas leakage to the fluid side. When the precharge pressure level
cannot be maintained within the limits stated in the previous guidelines,
replace the accumulator piston seals.
•
During normal operation, the accumulator piston should be near the center
of the accumulator cylinder. To check the approximate piston location, note
the warm-to-hot transition point on the accumulator cylinder wall during
operation. If the piston is near the charging stem end, the accumulator may
need charging. If the piston is at the other end, the accumulator may have an
excess charge, or more likely an excessive amount of hydraulic fluid has
collected in the gas chamber.
111 Accumulator: Check and Change Precharge Pressure
Special equipment
94
Maintenance
An accumulator charging kit (MTS part number 376986-01) is for any Series 111
Accumulator:
318 Load Unit
Routine Maintenance Overview Checklist
Prerequisite
To prepare the accumulator for precharge check:
WARNING
Accumulators are pressurized devices.
Pressurized accumulators and their parts can become lethal projectiles if
disassembled and can cause death to persons and/or damage to
equipment.
Do not remove an accumulator that is pressurized. Completely remove hydraulic
pressure and discharge the accumulator before any parts, except the protective
cover and valve stem cap, are removed.
1. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving.
2. Close the bleed valve on the accumulator charging kit. Remove the
protective cover and valve stem cap from the accumulator.
Check the Precharge
Pressure
318 Load Unit
1. Connect the charging kit chuck valve to the accumulator valve stem.
Maintenance
95
Routine Maintenance Overview Checklist
2. With an open-end wrench, turn the locknut counterclockwise on the
accumulator valve assembly to open the valve. Read the pressure on either
the high or low accumulator charging kit pressure gage.
•
If the pressure reading is other than the required pressure level recorded on
the accumulator, continue with the next subsection, “Change the Precharge
Pressure”.
•
If the pressure level corresponds to the level recorded on the accumulator
label, turn the locknut clockwise to close the valve and continue this
procedure.
3. Open the bleed valve on the accumulator charging kit and remove the chuck
valve from the accumulator. Replace the valve stem cap and protective
cover on the accumulator.
Change the Precharge
Pressure
Often the precharge of an accumulator mounted on a hydraulic supply line is
increased to enhance system performance and reduce the transient HPS flow
demands. Accumulators may be precharged to 10 MPa (1500 psi) or more,
although amounts above 14 MPa (2200 psi) will have less and less performance
effect in most situations. Be sure that you read the following warning before you
charge your accumulator.
WARNING
Accumulators have specific pressure ratings.
If the precharge pressure is too high, the accumulator can bottom out
causing the release of metal particles into the hydraulic fluid. Charging
accumulators above their rated level can damage system equipment.
Do not charge accumulators to pressures above their rated level. Charge
accumulators below their rated fatigue pressure of 21 MPa (3000 psi) for the
Model 111.11B and 22 MPa (3200 psi) for the Model 111.12C. Use a suitable
regulator and gage set to an accumulator’s charges.
Decreasing pressure
To decrease the precharge pressure:
1. Slowly open the bleed valve on the accumulator charging kit until gas
begins to escape. When the pressure reading on the appropriate pressure
gage drops to the level required, close the bleed valve.
2. Close the locknut (or close the chuck valve if you have a core-type valve).
Open the bleed valve on the accumulator charging kit and remove the chuck
valve from the accumulator.
3. Install the valve stem cap and protective cover.
Increasing pressure
To increase the precharge pressure:
1. Close the locknut on the accumulator (or close the chuck valve for a coretype valve).
2. Open the bleed valve two turns.
96
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
WARNING
Mixing gases can produce unpredictable results.
Do not use another gas to precharge an accumulator. Use only dry nitrogen gas to
precharge accumulators.
3. Connect the nitrogen supply hose from the supply bottle pressure regulator
output to the input check valve on the charging kit.
4. Open the nitrogen bottle valve. Check the nitrogen bottle pressure gage on
the regulator. (The bottle must contain sufficient pressure to provide an
adequate gas volume.)
5. Monitor the regulator output pressure gage and adjust the regulator output
pressure valve to the required level.
CAUTION
Rapid flow rates with pressure differentials of more than 2.1 MPa (300 psi)
across the input check valve can damage the valve seal(s).
Avoid rapid and extreme pressure transitions.
Do not allow rapid flow rates. Open the regulator shut-off valve only far enough to
permit a gradual transfer of gas.
6. Slowly open the regulator shut-off valve until gas is heard escaping from the
accumulator charging kit bleed valve. Allow gas to slowly escape for
approximately ten seconds, then close the bleed valve. Immediately close
the regulator shut-off valve before the pressure reading on either the high or
low charging kit pressure gage exceeds the pressure level of the
accumulator.
7. Open the locknut (or open the chuck valve for a core-type valve). Slowly
open the regulator shut-off valve until the pressure indicator on either the
high or low charging kit pressure gage begins to rise. When the pressure is at
the required pressure level (recorded on the accumulator), close the
regulator shut-off valve.
8. Close the locknut (or close the chuck valve for a core type valve).
9. Open the bleed valve on the accumulator charging kit and remove the chuck
valve from the accumulator.
10. Install the valve stem cap and protective cover. Close the valve on the
nitrogen bottle.
318 Load Unit
Maintenance
97
Routine Maintenance Overview Checklist
244 Actuator: Maintenance
The 244 Actuator is designed for extended periods of operation without extensive
maintenance requirements.
A summary of the routine maintenance procedures is listed below:
Weekly
Clean exposed areas of the actuator piston rod with a clean, dry, lint free rag. If
the actuator is continually exposed to a dirty operating environment, clean the
piston rod on a daily basis.
Monthly
Inspect actuator piston rod and seals for excessive wear and/or leakage. Small
scratches in the axial direction of the piston rod or polishing of the rod surface is
considered normal operating wear.
Yearly
Change actuator seals if necessary. Actuator assemblies can require more or less
frequent seal changes depending on usage. External oil leakage and/or decreased
performance are indicators of seal wear. Seal replacement is considered a service
procedure; contact you MTS Service Engineer for additional information.
298 HSM: Maintenance
The 298 Hydraulic Service Manifold requires the filter be changed periodically.
Dirty
Filter
Indicator
Return
Accumulator
Inlet
Filter
Pressure
Accumulator
Component Identification
98
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
CAUTION
Mixing different brands of hydraulic fluid can contaminate your system.
Contaminated hydraulic fluid can cause premature wear of the hydraulic
components in your system.
Do not mix different brands of hydraulic fluid. MTS Systems Corporation
recommends using Mobil DTE-25 or Shell Tellus 46 AW hydraulic fluid.
The filter element should be replaced whenever:
•
The indicator on the top of the filter housing is in the bypass position, which
indicates a dirty filter condition.
•
The hydraulic fluid in the hydraulic power unit is changed.
Replace the filter element with one of the same rating or better.
FILTER
PART NUMBER
KIT NUMBER
3 micron (Beta3 = 75)
011-395-937
044-205-301
10 micron (Beta7.4 = 75)
011-395-936
044-205-201
Perform the following procedure to change the filter element.
1. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving.
2. Turn off electrical power at the controller.
3. Place a waste fluid pan beneath the filter housing, which will accumulate
any small amount of drainage from the filter housing.
4. Remove the inlet filter bowl.
5. Remove the disposable filter element from the filter bowl.
6. Empty the oil in the filter bowl into the pan. Wipe out any remaining
sediment with a clean lint-free cloth.
7. Inspect the O-ring in the filter housing for any sign of deterioration. If
necessary, replace the defective O-ring (part number 010-010-726).
8. Lubricate the filter element and filter housing O-rings with clean hydraulic
fluid. Insert the replacement filter element into the filter bowl. Tighten the
filter bowl to 34–41 N·m (25–30 lbf·ft).
9. Apply low, then high, hydraulic pressure to the actuator manifold and
inspect the seal between the filter bowl and housing for any signs of
leakage. If leakage exists, turn off system hydraulic and electrical power and
repeat Steps 4 through 9.
318 Load Unit
Maintenance
99
Routine Maintenance Overview Checklist
252 Servovalve: Maintenance Overview
Maintaining the Series 252 Servovalves typically involves changing the filter
element (Series 252.3x only) and setting the mechanical null adjustment. Except
for these procedures, further disassembly, inspection, or repair of the servovalve
is not recommended and may void the servovalve warranty.
MTS does not recommend changing the 35-micron filter element in the Series
252.2x/.4x Servovalve (revision C). MTS hydraulic power supplies filter the
system hydraulic fluid at 3-microns absolute. The system filters will trap most
solid particle contaminants. If servovalve performance has deteriorated and the
cause has been isolated to the servovalve filter, return the servovalve to MTS for
service.
252 Servovalve: Replace the Filter Element
Under normal operating conditions, the 20-micron stainless steel filter used in the
servovalve should be replaced only if servovalve performance has deteriorated.
Ensure that other possible causes of poor performance, such as plugged system
filters and/or hydraulic power supply wear, have been eliminated before
replacing the servovalve filter.
Prerequisites
100
Maintenance
You must have a filter kit that contains the necessary filter element replacement
parts. The filter for the Series 252.3x Servovalves is MTS part number 032-844101. Contact MTS Systems Corporation for the filter for the revision G Series
252.2x/4x Servovalves
318 Load Unit
Routine Maintenance Overview Checklist
Procedure
To replace the filter element, perform the following procedure. Care should be
exercised to prevent dirt or other contaminants from entering the servovalve
body, filter passages, or manifold/actuator ports. Refer to the following figure
during the procedure.
Socket Head
Screws (4)
1
3
4
Filter Cover
Plate
2
Filter Plug
Filter Plug
O-Rings
Filter O-Ring
Filter
Filter Cover
Filter Housing
Model 252.2x/.4x Filter Location
Model 252.3x Filter Assembly
(Revision G only)
10. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving. Turn off electrical power to the controller.
For the Series 252.2x/4x Servovalve proceed as follows:
Note
318 Load Unit
This procedure only applies to revision G of the servovalve.
A.
Remove the four socket head screws and washers that secure the filter
cover plug.
B.
Thread one of the socket head screws, removed in Step A, into the filter
cover plug and pull it out of the filter housing.
C.
Remove the filter disk.
Maintenance
101
Routine Maintenance Overview Checklist
D.
Lightly lubricate the filter with clean hydraulic fluid and insert the
filter into the housing.
E.
Secure the filter cover plate to the housing using the four socket head
screws and washers removed in Step A.
For the Series 252.3x Servovalve proceed as follows:
A.
Remove the four socket head screws and washers that secure the filter
cover plate to the filter housing as shown below.
B.
Remove the filter plug by threading one of the socket head screws,
removed in Step A, into the filter plug and pulling it out of the filter
housing. Remove the filter cover plate.
C.
Remove the filter plug O-rings from the filter plug.
D.
Remove the filter O-ring from the filter.
E.
Remove the filter.
F.
Lightly lubricate the filter O-ring with clean hydraulic fluid, install it
on the replacement filter, and insert the filter into the housing.
G.
Lightly lubricate the filter plug O-rings with clean hydraulic fluid,
install them on the filter plug and install the filter plug.
H.
Secure the filter cover plate to the housing using the four socket head
screws and washers removed in Step A. Tighten each socket head
screw until it is firmly seated against the filter cover plate. Using the
sequence shown in the previous figure, tighten the socket head screws
to 4.5 N·m (40 lb·in). Continue using the sequence and tighten the
socket head screws to a final torque of 9.60 N·m (85 lb·in).
11. Turn on electrical and hydraulic system power.
12. Apply low hydraulic pressure to the servovalve so that hydraulic fluid
gradually fills the filter cavity.
13. Apply high hydraulic pressure and check for leaks.
252 Servovalve: Adjust the Mechanical Null
This procedure describes how to adjust the mechanical null for the Series 252
Servovalve. The mechanical null adjustment aligns the servovalve spool to a
position that allows little or no actuator movement when there is no control
signal.
Prerequisites
MTS Systems Corporation recommends that you read this procedure before
attempting to adjust the mechanical null. The mechanical null adjustment is quite
sensitive, and you should be familiar with the hazards that can be encountered
when performing the procedure.
Perform the servovalve mechanical null adjustment after the valve balancing
procedure (electrical compensation) has been completed and the results are
judged unsatisfactory.
102
Maintenance
318 Load Unit
Routine Maintenance Overview Checklist
During the servovalve mechanical null adjustment procedure, the actuator must
be able to move through full displacement in either direction without contacting a
reaction surface.
Valve balance
adjustments
MTS controllers have an electronic mechanical null adjustment called valve
balance. The valve balance adjustment is a convenient way to compensate for a
servovalve that needs a mechanical null adjustment. The adjustment introduces
an electrical offset signal that causes the servovalve to hold the position of the
actuator when a zero command is issued.
WARNING
Sudden and unexpected actuator rod movement can cause serious injury to
personnel and/or damage to equipment.
Do not perform the following procedure without clearing the path of motion
of the actuator.
Ensure that all personnel, specimen/structures, and tools are away from the path
of motion of the actuator (crush zone).
1. Exercise the actuator.
The actuator should be exercised to warm it up. Electrical and mechanical
adjustments are more repeatable after the actuator is warmed up.
A.
Select displacement control for the controller.
B.
Disable the reset integrator or adjust the Reset control for zero.
C.
Adjust the actuator for mid-displacement.
D.
Turn on electrical and hydraulic system power.
E.
Define a 50%, 0.1 Hz sine wave command and allow the actuator to
warm up for approximately one-half hour.
F.
After the warmup period, stop the test program.
2. Check for actuator movement.
This task is a test to determine how to proceed.
Disconnect the servovalve cable and observe the actuator rod.
•
If the actuator rod has no noticeable movement, the servovalve is at the
null position and does not need to be adjusted. Proceed to Step 4.
•
If the actuator rod noticeably moves, the servovalve requires
adjustment. Proceed to Step 3.
3. Set the adjuster pin.
This task describes the mechanical null adjustment procedure.
A.
318 Load Unit
Insert a 3/32-inch hex key into the adjustor pin socket. See the
following figure for the location of the adjustor pin.
Maintenance
103
Routine Maintenance Overview Checklist
CAUTION
Excessive torquing may shear off the adjustor pin eccentric.
Do not apply more than 12 lbf-in. (1.36 N•m) of torquing force to the adjustor
pin.
If the pin does not turn using very little force, proceed to Step C of this task.
104
Maintenance
B.
Slowly rotate the adjustor pin until the actuator movement is reduced to
a minimum, and then go back to Step 2. If the pin does not turn using
very little force, proceed to the next step.
C.
Reduce system pressure to low pressure (refer to the appropriate
controlling device product manual). Slowly rotate the adjustor pin until
the actuator movement is reduced to a minimum, and then proceed to
Step 4. If the adjustor pin still does not turn, proceed to the next step.
D.
Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise
the actuator until it stops moving. Turn off electrical power to the
controller.
E.
Remove the hex key and insert a 3/8-inch offset wrench over the selflocking nut.
F.
Insert a torque wrench with a 3/32-inch hex key head adapter into the
adjustor pin socket.
318 Load Unit
Routine Maintenance Overview Checklist
G.
Using the offset wrench, loosen (but do not remove) the self-locking
nut.
Mechanical Null Adjustor Pin
H.
Turn the adjustor pin until the scribe mark on the adjustor pin is
pointing toward the base of the servovalve.
I.
Tighten the self-locking nut until 1.13 to 1.36 N·m (10 to 12 lb-in) of
torque is needed to turn the adjustor pin, ensuring that the scribe mark
remains pointing toward the base of the servovalve.
J.
Remove the torque wrench and offset wrench.
4. Finish the procedure.
318 Load Unit
A.
Ensure that the actuator is warmed up. If not, go to Step 1.
B.
Remove hydraulic and electric power from the system.
C.
Reconnect the servovalve cable.
D.
Reapply hydraulic and electric power to the system.
E.
See your controller manual to complete the valve balance procedure.
Maintenance
105
Routine Maintenance Overview Checklist
106
Maintenance
318 Load Unit
Servohydraulic Load Frame Maintenance and Service
Logs
Contents
8 Hours/Daily
108
40 Hours/Weekly
109
80 Hours/Biweekly
110
500 Hours: Crosshead and Frame
500 Hours: Actuator
500 Hours: HSM
111
112
113
500 Hours: Hoses and Cables
114
500 Hours: Overall Complete System
500 Hours: Grips
1000 Hours
115
116
117
2000 Hours: Annual Maintenance
118
Servohydraulic Load Frame Maintenance and Service Logs
107
8 Hours/Daily
8 Hours/Daily
8 Hours/Daily Service Interval Recommendation
DATE
108
CHECK ACTUATOR
PLATEN AREA TO
BE CLEAN
MONITOR FILTER
INDICATORS
PERFORMED BY
PERFORMNED BY NOTES
Servohydraulic Load Frame Maintenance and Service Logs
40 Hours/Weekly
40 Hours/Weekly
40 Hours/Weekly Service Interval Recommendation
DATE
CHECK HOSES/
CABLES/
CONNECTORS
CHECK
CHECK
CHECK
CROSSHEAD/
ACTUATOR AREA HYDRAULIC
LIFTS/SUPPORTS TO BE DRY
SERVICE
MANIFOLD
PERFORMED BY
PERFORMNED BY PERFORMNED BY PERFORMNED BY PERFORMNED BY PERFORMNED BY NOTES
CHECK LIFT
CHECK LOCK
SEAL CONDITION SEAL CONDITION
TO BE DRY
TO BE DRY
Servohydraulic Load Frame Maintenance and Service Logs
109
80 Hours/Biweekly
80 Hours/Biweekly
80 Hours/Biweekly Service Interval Recommendation
BIONIX LUCRICATE
CHECK
AXIAL/TORSIONAL
ACTUATOR
SPLINE (75-100 HRS)
DATE
110
PERFORMED BY
PERFORMNED BY NOTES
Servohydraulic Load Frame Maintenance and Service Logs
500 Hours: Crosshead and Frame
500 Hours: Crosshead and Frame
500 Hours Service Interval Recommendation
CHECK
CROSSHEAD/
LIFTS/
SUPPORTS
DATE
LIFT SEAL
CONDITION IS
DRY
LOCK SEAL
CONDITION IS
DRY
CROSSHEAD
COLUMNS ARE
CLEAN
COLUMN
ABRASIONS ARE
ACCEPTABLE
PERFORMED BY PERFORMNED BY PERFORMNED BY PERFORMNED BY PERFORMNED BY NOTES
500 Hours Service Interval Recommendation
DATE
CROSSHEAD
SPEED IS
APPROPRIATE
CROSSHEAD
LOAD FRAME
UNLOCK CAUSES SUPPORT/
PROGRAM
AIRBAGS/PADS
INTERLOCK
PERFORMNED BY
PERFORMNED BY
CROSSHEAD
MOVEMENT IS
SMOOTH
PERFORMNED BY PERFORMNED BY
NOTES
Servohydraulic Load Frame Maintenance and Service Logs
111
500 Hours: Actuator
500 Hours: Actuator
500 Hours Service Interval Recommendation
DATE
CURSORY CHECK
OF ACTUATOR
ACTUATOR AREA
IS DRY
ACTUATOR PLATEN
AREA IS CLEAN
PERFORMED BY
PERFORMED BY
PERFORMED BY
NOTES
500 Hours Service Interval Recommendation
DATE
112
BIONIX LUBRICATE
AXIAL/TORSIONAL
SPLINE
(75-100 HRS)
PISTON ROD WEAR
IS ACCEPTABLE
PERFORMED BY
PERFORMED BY
NOTES
Servohydraulic Load Frame Maintenance and Service Logs
500 Hours: HSM
500 Hours: HSM
500 Hours Service Interval Recommendation
CURSORY CHECK MONITOR FILTER
INDICATORS
SERVICE
MANIFOLD
MANIFOLD HOSE ACCUMULATOR
CONNECTIONS
CONNECTIONS ARE
DRY
ARE TIGHT
PERFORMED BY
PERFORMNED BY PERFORMNED BY
OF HYDRAULIC
DATE
PERFORMNED BY
NOTES
500 Hours Service Interval Recommendation
DATE
ACCUMULATOR
CONNECTIONS
ARE TIGHT
ACCUMULATOR
CAPS/GUARDS
ARE PRESENT
PERFORMNED BY
PERFORMNED BY PERFORMNED BY
OIL ON THE GAS
SIDE OF THE
PISTON
CHECK AND
ADJUST PRESSURE
IN ACCUMULATOR
PERFORMNED BY
NOTES
Servohydraulic Load Frame Maintenance and Service Logs
113
500 Hours: Hoses and Cables
500 Hours: Hoses and Cables
500 Hours Service Interval Recommendation
DATE
114
CURSORY
CHECK OF
HOSES/CABLES/
CONNECTORS
ABSENCE OF
HOSE
ABRASIONS,
BLISTERS,
VULCANIZING
PERFORMED BY
PERFORMNED BY PERFORMNED BY PERFORMNED BY PERFORMNED BY
CABLE
CONDITION AND
ROUTING IS
ACCEPTABLE
CHECK
TRANSDUCER
CONNECTIONS
Servohydraulic Load Frame Maintenance and Service Logs
HOSE
CONNECTIONS
AND CRIMPS ARE
DRY
NOTES
500 Hours: Overall Complete System
500 Hours: Overall Complete System
500 Hours Service Interval Recommendation
DATE
OVERALL
SYSTEM
CONDITION IS
ACCEPTABLE TO
USE
APPROPRIATE/
SYSTEM STABLE
PERFORMED BY
PERFORMNED BY PERFORMNED BY PERFORMNED BY
TUNING
PARAMETERS
E-STOP IS
WORKING IF
APPLICABLE
ARE
RESPONSE TO
FULL STROKE
WAVEFORM,
VISUAL AND
AUDIBLE
NOTES
500 Hours Service Interval Recommendation
VALVE BALANCE
CHECK
VALVE DITHER
RESPONSE
DISPLACEMENT
CONTROL
DATE
PERFORMNED BY PERFORMNED BY
NOTES
Servohydraulic Load Frame Maintenance and Service Logs
115
500 Hours: Grips
500 Hours: Grips
500 Hours Service Interval Recommendation
DATE
116
CURSORY CHECK
OF GRIPS/GRIP
CONTROL
GRIP SUPPLY
CONNECTIONS
ARE DRY
GRIP SEALS ARE
DRY
PERFORMED BY
PERFORMNED BY
PERFORMNED BY PERFORMNED BY PERFORMNED BY NOTES
GRIP ACTION IS
ACCEPTABLE
Servohydraulic Load Frame Maintenance and Service Logs
LUBRICATE GRIP
INSERTS
1000 Hours
1000 Hours
1000 Hours Service Interval Recommendation
DATE
ALL 500 HR
MAINTENANCE
PROCEDURES
HYDRAULIC
CROSSHEAD LOCKS
ARE FUNCTIONING
PROPERLY
BLEED
CROSSHEAD LIFT
CYLINDERS
PERFORMED BY
PERFORMNED BY
PERFORMNED BY
NOTES
Servohydraulic Load Frame Maintenance and Service Logs
117
2000 Hours: Annual Maintenance
2000 Hours: Annual Maintenance
2000 Hours Service Interval Recommendation
ALL 1000 HR
MAINTENANCE
PROCEDURES
DATE
118
LUBRICATE
MANUAL
CROSSHEAD
LOCK BOLTS
CHANGE
HYDRAULIC
SERVICE
MANIFOLD
FILTERS
PERFORMED BY PERFORMNED BY PERFORMNED BY
LOW PRESSURE
ADJUSTMENT
(MODEL 294
HSM)
PERFORMNED BY NOTES
Servohydraulic Load Frame Maintenance and Service Logs
m
MTS Systems Corporation
14000 Technology Drive
Eden Prairie, Minnesota 55344-2290 USA
Toll Free Phone: 800-328-2255
(within the U.S. or Canada)
Phone: 952-937-4000
(outside the U.S. or Canada)
Fax: 952-937-4515
E-mail: info@mts.com
http://www.mts.com
ISO 9001 Certified QMS