SERV7105-06
June 2005
Vol. 6, No. 1
SERVICE TRAINING
TECHNICAL PRESENTATION
345C HYDRAULIC EXCAVATOR
New Product Introduction
(NPI)
345C HYDRAULIC EXCAVATOR
AUDIENCE
Service personnel who understand the principles of machine systems operation, diagnostic
equipment, and testing and adjusting procedures.
CONTENT
This presentation provides new and different New Product Introduction (NPI) information on
the 345C Hydraulic Excavator. This presentation may be used for self-paced and self-directed
training.
OBJECTIVES
After learning the information in this presentation, the serviceman will be able to:
1. locate and identify the new major components on the 345C Hydraulic Excavator;and
2. explain the operation of the new component in the system.
REFERENCES
345C Hydraulic Excavator Specalog
AEHQ6521-01
345C Hydraulic Excavator Specifications Manual
RENR7283-00
345C Hydraulic Excavator Systems Operations Manual
RENR7324-02
345C Hydraulic Excavator Test and Adjust Manual
RENR7325-01
345C Hydraulic Excavator Parts Book
SEBP4205-00
Estimated Time: 1 Hour
Illustrations: 36
Handouts: 2
Form: SERV7105-06
Date: 06/05
© 2005 Caterpillar Inc.
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TABLE OF CONTENTS
INTRODUCTION ..................................................................................................................5
Similarities and Differences .............................................................................................6
MACHINE WALK-AROUND...............................................................................................7
OPERATOR'S STATION......................................................................................................13
ENGINE................................................................................................................................23
HYDRAULIC SYSTEM ......................................................................................................24
Hydraulic Pilot Pump .....................................................................................................25
MAIN HYDRAULIC SYSTEM ..........................................................................................27
FAN SYSTEM ......................................................................................................................38
MAINTENANCE ITEMS ....................................................................................................41
TOOL CONTROL SYSTEM ...............................................................................................42
CONCLUSION.....................................................................................................................43
HYDRAULIC COLOR CODE SCHEMATIC.....................................................................44
HANDOUTS.........................................................................................................................44
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NOTES
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345C HYDRAULIC EXCAVATORS
© 2005 Caterpillar Inc.
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INTRODUCTION
The 345C is a new model from Caterpillar. It is a direct replacement for the 345B Series II
Hydraulic Excavator. The 345C was introduced in March 2005. The 345C operating weight is
approximately 44,970 Kg (99,150 lbs) for a Standard Machine. The 345C fits in the 45 metric
ton class of excavators. The 345C is a versatile machine capable of performing a wide range of
tasks by using various work tools available.
The presentation discusses the component locations and systems operation of the 345C
Hydraulic Excavator. Basic engine and machine component locations will be discussed. Power
train, and the implement hydraulics will also be covered.
There are three basic machine arrangements available in the North American market.
- 345C L (345C excavator with a long, fixed width undercarriage)
- 345C LVG (345C excavator with a long, variable gauge undercarriage)
- 345C LWVG (345C excavator with a long, wide, variable gauge undercarriage)
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SIMILARITIES AND DIFFERENCES
FEATURES
DIFFERENT
Machine Appearance
SIMILAR
SAME
X
Operator's Station
X
Engine
X
Implement Hydraulic System
X
Monitoring System
X
Maintenance Items
X
Tool Control Systems
X
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Similarities and Differences
The above chart displays the similarities and differences between the 345C and the 345B
Series II.
This illustration compares the basic features of the 345C to the previous 345B. The chart illustrates if the features are different, similar, or the same.
New and improved features include:
- Tier III ACERT engine
- new style hydraulic pumps
- cab and styling
- monitoring system
- tool control options
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MACHINE WALKAROUND
- Boom (1)
- Access door behind cab (2) - The access door behind the operators station provides access
to the machine ECM, master disconnect switch, batteries, vandalism guards, engine
coolant expansion tank, fuel filter and water separator, air filter, and the air conditioning
condenser.
- Engine access cover (3) - The access cover provides access to the engine oil fill and filter.
- Stick (4)
- Bucket (5)
- Operator station (6)
- Access door to radiator compartment (7)
- Counterweight (8)
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The compartment behind the operator station includes the following components:
- Machine ECM (1)
- Window washer reservoir (2)
- Master disconnect switch and circuit breakers (3)
- Batteries (4)
- Vandalism guards (5)
- Engine coolant expansion tank (6)
- Fuel filter and water separator (7)
- Dual element, radial seal air filter (8)
- Air conditioning condenser and dryer (9)
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The radiator access compartment is located in front of the counter weight. Although the door is
hinged, bolts must be removed on the left side to access the components.
This door provides access to assist in cleaning the components.
- Air to air after-cooler (1)
- Hydraulic oil cooler (2)
- Engine radiator (3)
- Fuel cooler (4)
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The 345C is available with the optional counterweight removal system.
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This illustration shows access to the top of the machine from the right side.
The engine access cover (1) allows access to the engine from the top of the machine.
The machine hydraulic oil reservoir (2) is located between the pump compartment and the
diesel fuel tank on the right side of the machine and is accessed from the top of the machine.
The diesel fuel filler cap (3) is accessed from the top of the machine.
The storage compartment (4) is located in the front of the machine.
The ladder (5) on the front of the machine can be used for access to the top of the machine.
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The illustration shows the pump compartment on the right side of the machine. The
compartment is accessed from the right side of the machine when the rear access door is open.
Some of the visible components are:
- Engine oil filter (1)
- Engine oil S•O•S port (2)
- Auxiliary oil pump (3)
- Power shift solenoid and proportional reducing valve (PSPRV) (4)
- Pilot pump (5)
- Counterweight removal valve (6)
- Auxiliary tool solenoids (7)
- Right pump (8)
- Left pump (9)
- Pilot filter (10)
- Case drain filters (11)
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OPERATOR'S STATION
The 345C contains a newly designed cab. The 345C introduces a new operator's station with
improved visibility and operator comfort. The 345C carries a 24 volt AM FM radio standard in
the right console. For operator comfort the new cab offers a fully adjustable air suspended seat,
with side-to-side shock absorption, which provides maximum operator comfort. Conveniently
placed switches, gauges, information display, and controls improve operator comfort, awareness, and efficiency. The new C series monitor provides increased functionality for the
operator.
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The hydraulic activation lever (1) has been redesigned for the 345C, however, its purpose is
still the same. With the lever in the DOWN position (shown), the hydraulic activation solenoid
is in the de-activated position.
The ground level, emergency engine shutoff switch (2) is located on the bottom of the seat
mount.
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Below the operators seat in the cab is the ground level, emergency engine shutoff switch.
This safety switch will shut off the machine without having to climb into the cab. The key start
switch must be cycled for the machine to operate again.
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All of the operator functions are incorporated into the right side of the operator's station. They
are:
- Engine speed dial switch (1)
- Key start switch (2)
- Cigar lighter (3)
- Soft switch panel (4)
- Rocker switches (5)
- HVAC controls (6)
- Radio (7)
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The soft switch panel is a panel of switches that either turns a function on/off or allows the
operator to toggle through different modes of the selected function. The soft switches provide
the operator with the following functions:
Two-speed travel (1)
When the button is pushed the travel speed is the travel speed is toggled between low and auto.
- The rabbit indicator indicates auto speed.
- The tortoise indicator indicates low speed.
Automatic Engine Speed Control (AESC) Switch (2)
The AESC function automatically reduces engine speed while there is no hydraulic demand,
which reduces noise and fuel consumption.
- The AESC switch disables and enables the AESC function.
- The first stage AESC reduces the engine speed by 100 rpm after there has been no
hydraulic demand for approximately three seconds.
- The second stage AESC reduces the engine rpm to approximately 1300 rpm after there
has been no hydraulic demand for an additional three seconds.
- The second stage AESC delay times can be changed using the monitor or Caterpillar
Electronic Technician (ET).
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Travel alarm cancel (3)
The travel alarm cancel switch is a momentary two-position switch.
- The travel alarm sounds when travel is detected.
- The travel alarm stops immediately if the travel alarm cancel switch is depressed.
- The travel alarm switch is reset every time the travel pressure switch opens.
Work tool switch (4)
The work tool switch will display the selected work tool on the monitor display. Press the
switch repeatedly in order to change the selected work tool.
Work lights (5)
The work lights switch toggles between the different work light combinations.
- Pattern 1 - Chassis work lights and cab work lights.
- Pattern 2 - Chassis work lights, cab work lights and boom work lights..
Upper window wipers (6)
The wiper switch toggles between the different modes of the wipers.
- Six second delay.
- Three second delay.
- Continuous operation.
- Off.
Upper window washer (7)
The windshield washer fluid switch is an ON/OFF switch.
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Heavy lift (8)
The heavy lift mode can be selected to boost lifting capability and provide improved
controlability of heavy loads
- When heavy lift is turned on, the main relief valve increases from 35 MPa (5076 psi) to
36 MPa (5200 psi), making it possible to operate at the high pressure.
- In heavy lift mode, the maximum engine speed is limited to engine speed dial 6
(1600 rpm).
- Hydraulic output is restricted to 60%.
The rocker switches are two-position switches used to turn the functions on or off. The rocker
switches provides the operator with the following functions:
Fine swing control (9)
The fine swing control switch is a two-position rocker switch.
- The top position activates fine swing control. Fine swing control improves the swing
control during swing deceleration.
- The bottom position deactivates fine swing control.
Lower window wipers (10)
The lower window wiper switch is a two-position rocker switch.
- The top position activates the wipers.
- The bottom position deactivates the wipers.
Lower window washer (11)
The lower window washer fluid switch is a two-position rocker switch.
- The top position activates the windshield washer fluid.
- The bottom position deactivates the windshield washer fluid.
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The back-up switches are located behind the right armrest. The left switch (3) toggles between
back-up and auto. The right switch (2) controls the engine rpm.
Back-up switch (3) ACTIVATES/DEACTIVATES the Back-up Mode. When Back-up Mode is
active a fixed power shift pressure is provided to the pumps. The fixed power shift pressure
limits maximum pump output and allows the machine to continue operating in a Derate Mode.
Machine productivity will be limited while the machine is in Back-up Mode.
Back-up switch (2) is used to control the engine speed while Back-up Mode is active. Back-up
switch (2) toggles to increase and decrease engine speed while in Back-up Mode. Holding the
speed switch in the DOWN position will cause the engine to go to 0 rpm.
The diagnostic connector (1) is located inside of the operators station. It is located behind the
right armrest, beside the back-up switches.
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The 345C has a newly designed monitor. The 345C shares this style monitor with the 365C
and the 385C.
The monitor is a full color Liquid Crystal Display (LCD) graphic display that displays the
various parameters of the machine.
- Alert Indicator (1)
- Clock (2)
- Engine Speed Dial Indicator (3)
- Fuel Gauge (4)
- Hydraulic Oil Temperature Gauge (5)
- Engine Coolant Temperature Gauge (6)
- Operating Hours (7)
- Work Tools (8)
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The monitor contains eight buttons that control the navigation on the screen. The four
directional button are up (1), right (2), down (3), and left (4). The four navigational buttons are
home (8), menu (7), back (5), and OK (6).
The directional buttons navigate the cursor through the various screens.
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ENGINE
The 345C is equipped with a C13 ACERT Engine (6). It is rated at 257kW (345hp) at 1800
rpms. This represents a 24 HP increase over the 345B II. The C13 ACERT incorporates
state-of-the-art technologies to meets US EPA Tier III regulated emission levels.
- Advanced Diesel Engine Management (ADEM II)
- Air to Air Aftercooler (ATAAC)
- Mechanically Actuated Unit Fuel Injector (MEUI)
Also visible is the fuel priming pump (2), various fuel sensors (1), engine oil check (3), engine
oil fill (4), and the S•O•S coolant sampling valve (5).
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HYDRAULIC SYSTEM BLOCK DIAGRAM
Stick Cylinder
Bucket Cylinder
Swing Motor
Main Control Valve Group
Pilot
Control
Valves
Priority
Valves
Pilot Manifold
Pilot
Pump
Fan
Motor
Boom Cylinders
Travel Motors
Main
Hydraulic
Pumps
M
Fan
Pump
Tank
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HYDRAULIC SYSTEM
The 345C uses a negative flow type hydraulic system. The main control valve is similar to the
345B II. The pumps are new, and the fan system is now electronically controlled. The 345C
has adopted many of the medium “C “excavator ideas, such as automatic priorities and tool
control systems.
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Hydraulic Pilot Pump
The pilot pump is mounted to the main hydraulic pump case. The pilot pump draws oil from
the pump case and sends it to the pilot filter, then to the pilot system.
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The 345C pilot manifold now resembles a medium "C" pilot manifold. The pilot manifold is
accessible by removing the cover plate under the machine, behind the swing bearing. It is
located directly below the main control valve.
- Hydraulic activation solenoid (1)
- Swing brake solenoid (2)
- Two-speed travel solenoid (3)
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STMG
345C HYDRAULIC SYSTEM
Travel Motor (Left)
Travel Motor (Right)
Swing Motor
Swing Motor
Stick Cylinder
Bucket
Cylinder
BR3
Boom
Cylinders
AR3
BL3
AL3
BL4
AL4
Swivel
Group
AR2
BR2
BL1
Travel (L)
AL1
Travel (R)
aR1
aL1
bR1
BL3
BL1
AL3
AL4
BL4
aR3
BR3
AR3
BR2
Stick
(1)
bR1
bL3
bL1
bR2
aR4
BL1
AL1
AR2
BR1
AR1
AL1
Swing
bL1
Travel
(L)
Boom
(2)
Attch
Bucket
Boom
(1)
Stick
(2)
Travel
(R)
Swing Bucket
Stick
OUT
IN
L
R
Boom
OPEN CLOSE DOWN UP
PR
bR3
aR4
bL3
bL4
aL3
aR2
aR1
PL
aL1
aL3
bL4
aR3 bR2 bR3 aR2
PL
P
M
PR
P
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MAIN HYDRAULIC SYSTEM
The main hydraulic system is a Negative Flow Controlled system. The main hydraulic system
supplies hydraulic power at high pressures and high flow rates to perform work. Two main
hydraulic pumps supply oil to the main control valve group. The individual hydraulic circuits
are controlled by valves in the the main control valve group.
The main hydraulic system supplies the following circuits:
- Swing
- Stick
- Travel
- Boom
- Bucket
- Tool control
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The 345C hydraulic system has been redesigned to improve reliability and to add a new tool
control system.
The 345C uses a Kawasaki designed main hydraulic pump group rated at 2 x 95 gpm
(2 x 360 L/Min). The pump group has two variable displacement piston pumps inside a
common housing, in a side-by-side configuration. The pumps will be referred to as the rear
(drive) pump and the front (idler) pump throughout this presentation. The rear pump is driven
by the engine via a flexible coupling. The front pump is driven by the drive pump through a
gear train. The number of teeth on the gear of the drive pump is one tooth less than the gear of
the idler pump in order to reduce harmonics in the hydraulic system. The difference in rotational speed due to the gearing has no significant impact on the machine performance or flow output. There is an internally mounted charge pump.
The pilot pump (1) is mounted to the main hydraulic pump case. The pilot pump draws oil
from the pump case and sends it to the pilot filter (6), then to the pilot system.
The power shift proportional reducing solenoid valve (PSPRV) (2) is mounted to the top and
front of the pump case. The power shift PRVs uses pilot oil as a control signal to the pumps.
Power shift pressure can be checked at tap (9).
The pump regulators (3) sit on top of the pump case. Each rotating group has its own regulator.
The regulators are used to adjust the output flow of the pumps.
The front (4) and rear (5) pumps each have there own pressure tap and pressure sensor.
Two case drain filters are located behind the pilot filters.
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Also visible in the pump compartment are:
- Pilot filter and relief valve (6)
- Front pump (4)
- Rear pump (5)
- Rear pump regulator (3)
- Front pump regulator (10)
- Front pump pressure tap and pressure sensor (7)
- Rear pump pressure tap and pressure sensor (8)
- Pilot pump (1)
- Power shift solenoid (2)
- Power shift pressure tap (9)
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The 345C contains two case drain filters. They are located behind the pilot oil filter in the main
pump compartment. The front case drain filter (1) is for the pump case drain system and the
rear case drain filter (2) is for the travel and swing system.
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The engine oil filter (1) is remotely mounted in the pump compartment for easy serviceability.
The engine oil filter base contains the engine oil S•O•S port (2).
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The main control valve group is located in the center of the upper structure of the machine.
The main control valve group receives pilot oil signals from the operator controls in the cab.
Each pilot signal then causes the appropriate control valve to shift in the correct direction.
When the valve shifts, oil flows from the main hydraulic pumps to the appropriate hydraulic
cylinder or hydraulic motor to perform work. The 345C main control valve is similar to the
345B II valve. The valves are:
- Stick 2 (1)
- Boom Drift Reduction Valve (2)
- Boom 1 (3)
- Bucket (4)
- Attachment (5)
- Right Travel (6)
- Main Relief Valve (7)
- Left Travel (8)
- Swing (9)
- Stick 1 (10)
- Stick Drift Reduction Valve (11)
- Boom 2 (12)
The straight travel valve is not shown but is located on the bottom, center of the Main Control
Valve.
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The main control valve contains two pressure switches, the travel pressure switch (1) and the
swing/implement pressure switch (2). The pressure switches are activated by the pilot logic
network. The switches close at 1520 kPa (220 psi) and open at 1127 kPa (166 psi).
The pressure switches are inputs to the machine ECM. The machine ECM uses these inputs to
tell when a hydraulic function has been activated and will release the swing brake and/or turn
the Automatic Engine Speed Control (AESC)/one touch low idle back to the current speed dial
setting.
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The 345C has a pilot operated, two stage main relief valve. (Heavy lift or implement/travel).
The settings are 35,487 KpA (5147 psi) for implement/travel and 36,493 KpA (5293 psi) for
heavy lift mode. The high pressure setting for heavy lift must be correctly adjusted before
adjustments can be made for implement/travel settings. Refer to the Testing and Adjusting
manual RENR7325 for the proper procedure on setting the main relief valve.
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The 345C is available with the heavy lift option. Heavy lift provides a means to have increased
hydraulic pressure available to help complete the tack.
Heavy lift is activated by pressing the heavy lift switch on the soft switch panel in the operators
station. The heavy lift switch is an input to the ECM. The ECM decreases engine speed to
approximately speed dial 6, activates the heavy lift solenoid which directs pilot oil to the main
relief valve, and increases the power shift pressure to limit the pumps to approximately 60% of
hydraulic horse power. Heavy lift mode will decrease the flow output of the pumps.
Decreasing the flow output of the pumps is done to provide increased controlability and
hydraulic smoothness during a heavy lift operation.
Heavy Lift Specs:
- Engine rpm range for Heavy Lift is 1420-1600 rpms.
- Hydraulic horse power is limited to 60% of full power during Heavy Lift.
- Main relief pressure range during Heavy Lift is 5147-5293 psi.
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The 345C now uses automatic priorities for certain functions based on the position of the
joysticks. The 345C does not use priority modes on the monitor like the 345B II did.
The boom priority (1) and the swing priority (2) pressure reducing valves are located behind the
swing bearing on the left side of the machine.
The boom priority PRV provides boom up priority over the stick in function. The swing priority PRV provides swing priority over the stick in or stick out function.
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The 345C contains two swing motors (1). They are fed by the swing control valve. The swing
control valve receives pump oil from the left pump. The swing drive oil level can be checked
with dipstick (2).
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FAN SYSTEM BLOCK DIAGRAM
Stick Cylinder
Bucket Cylinder
Swing Motor
Main Control Valve Group
Pilot
Control
Valves
Priority
Valves
Pilot Manifold
Pilot
Pump
Fan
Motor
Boom Cylinders
Travel Motors
Main
Hydraulic
Pumps
M
Fan
Pump
Tank
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FAN SYSTEM
The fan system is used to cool the hydraulic oil, engine radiator, fuel cooler, and the ATAAC.
The 345C features an electronically controlled, variable displacement, piston pump for the fan
circuit.
Operation of the fan circuit is similar to the 345B II machines, however the displacement of the
fan pump is now electronically controlled.
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The fan pump is mounted on the left front (counterweight side) of the engine, and is driven
though the front gear train.
The pump controls now have a proportional solenoid mounted in them. The solenoid directs oil
to control the displacement of the fan pump. The solenoid is an output of the ECM. The
solenoid uses engine coolant temperature and hydraulic oil temperature to determine the
displacement of the pump.
The solenoid can be calibrated through the monitor or through Caterpillar ET in the fan speed
calibration.
Under normal operating conditions, the fan rpm will vary between 600 and 1050 rpm. If the
solenoid signal goes to zero, the fan speed will go to a maximum mechanical fan speed that is
governed by the pump controls. The fan speed will be greater than 1050 rpms and pump
delivery pressure around 4500 psi. Maximum speed will be constant, regardless of coolant and
oil temperatures. If there is an open circuit, an error code will appear on the monitor as well.
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The fan motor is a fixed displacement piston motor. The swashplate of the fan motor is at a
fixed maximum position. Case drain oil from the fan motor is shared with the swing motors
and the travel motors. Return oil from the motor is sent to the return filters and into the
hydraulic tank.
An internal makeup valve in the motor is used to supply makeup oil to the motor when flow
from the pump is shut off. The makeup oil allows the motor to get oil when no flow is present
in order to prevent the motor from cavitating. The makeup oil prevents damage and premature
wear.
The direction of the fan can be reversed on machines equipped with the reversible fan. The
reversal of the fan motor is used to clear debris and dust from the radiator and hydraulic oil
cooler. The direction of rotation can be changed with the monitor.
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MAINTENANCE ITEMS
Caterpillar Electronic Technician (ET) or the monitoring system can be used for testing and
calibrating the machine.
Extended fluid change intervals are available with the proper S•O•S procedures.
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TOOL CONTROL SYSTEM
The tool control system for the 345C is similar in function to the tool control systems for the
320C - 330C medium excavators.
The optional tool control system maximizes work tool productivity by configuring hydraulic
flow, pressure, and operator controls to match a specific work tool. System versatility enables a
wide range of tool to be used.
The 345C is available with the following factory installed Tool Control systems:
- System 3 (Hammer) - provides two pump flow in a single direction only. Includes
mechanical LRV for lower psi tools (single action).
- System 5/15 (Thumb) - provides one pump flow in both directions (extend/retract double
action) can be controlled with a foot pedal (system 5) or with joystick buttons
(system 15).
- System 14 (Multifunction) - provides one or two pump flow on one or two directions
(single action or double action). System 14 has full electronic controls with a dedicated
work tool system ECM. System 14 also features an independent medium pressure circuit
used for such applications as a rotating shear or ditch cleaning bucket.
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CONCLUSION
This presentation has provided New Product Introduction (NPI) information for the Caterpillar
345C Hydraulic Excavator. The new components and their locations were identified and discussed.
Refer to the latest service literature for more information and specifications.
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NPI
Handout No. 1
HYDRAULIC SCHEMATIC COLOR CODE
Black - Mechanical Connection. Seal
Red - High Pressure Oil
Dark Gray - Cutaway Section
Red / White Stripes - 1st Pressure Reduction
Light Gray - Surface Color
Red Crosshatch - 2nd Reduction in Pressure
White - Atmosphere or Air (No Pressure)
Pink - 3rd Reduction in Pressure
Purple - Pneumatic Pressure
Red / Pink Stripes - Secondary Source Oil Pressure
Yellow - Moving or Activated Components
Orange - Pilot, Signal or Torque Converter Oil
Cat Yellow - (Restricted Usage)
Identification of Components
Within a Moving Group
Orange / White Stripes Reduced Pilot, Signal or TC Oil Pressure
Brown - Lubricating Oil
Orange / Crosshatch - 2nd Reduction in
Pilot, Signal or TC Oil Pressure
Green - Tank, Sump, o r Return Oil
Blue - Trapped Oil
Green / White Stripes Scavenge / Suction Oil or Hydraulic Void
HYDRAULIC SCHEMATIC COLOR CODES
The colors on the hydraulic schematics and cross-sectional views shown throughout this presentation denote specific meanings. This illustration identifies the meaning of each color.
Blue - Trapped Oil
Green - Tank, Sump, o r Return Oil
- 45 -
Green / White Stripes Scavenge / Suction Oil or Hydraulic Void
Orange / Crosshatch - 2nd Reduction in
Pilot, Signal or TC Oil Pressure
Orange / White Stripes Reduced Pilot, Signal or TC Oil Pressure
Cat Yellow - (Restricted Usage)
Identification of Components
Within a Moving Group
Brown - Lubricating Oil
Orange - Pilot, Signal or Torque Converter Oil
Red / Pink Stripes - Secondary Source Oil Pressure
Pink - 3rd Reduction in Pressure
Yellow - Moving or Activated Components
Purple - Pneumatic Pressure
White - Atmosphere or Air (No Pressure)
Red Crosshatch - 2nd Reduction in Pressure
Red / White Stripes - 1st Pressure Reduction
Dark Gray - Cutaway Section
Light Gray - Surface Color
Red - High Pressure Oil
Black - Mechanical Connection. Seal
HYDRAULIC SCHEMATIC COLOR CODE
SERV7105-06
Vol. 6, No. 1, 2005
NPI
Handout No. 2