23927 version 1
Page 1 of 4
Demonstrate knowledge of automotive hydraulic principles, practices,
systems and components
Level
3
Credits
4
Purpose
This theory-based unit standard is for people in the automotive engineering
and/or related engineering industries. People credited with this unit standard
are able to demonstrate knowledge of: hydraulic principles applying to
automotive components; good work practices when repairing hydraulic
systems; and hydraulic systems and components used in automotive
applications.
Subfield
Motor Industry
Domain
Automotive Hydraulics
Status
Registered
Status date
21 September 2007
Date version published
21 September 2007
Planned review date
31 December 2012
Entry information
Open.
Replacement information
This unit standard and unit standard 23928 replaced unit
standard 931.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Legislation relevant to this unit standard includes but is not limited to – Health and
Safety in Employment Act 1992.
 New Zealand Qualifications Authority 2016
23927 version 1
Page 2 of 4
2
Definition
Service information may include but is not limited to – technical information of a
vehicle, machine, or product detailing operation; installation and servicing
procedures; manufacturer instructions and specifications; technical terms and
descriptions; and detailed illustrations. This can be accessed in hard copy or
electronic format and is normally sourced from the manufacturer.
Elements and performance criteria
Element 1
Demonstrate knowledge of hydraulic principles applying to automotive components.
Performance criteria
1.1
The roles of pressure and flow in automotive hydraulics are described in
accordance with service information.
Range
1.2
The relationship between hydrodynamics and hydrostatics is defined in
accordance with service information.
Range
1.3
forces, energy transfer, work, power.
energy principles applicable to automotive components.
Types of integrated hydraulic systems are described in accordance with service
information.
Range
electronic, pneumatic.
Element 2
Demonstrate knowledge of good work practices when repairing hydraulic systems.
Performance criteria
2.1
Clean work practices when working with hydraulic systems are described in
accordance with service information.
Range
2.2
includes but is not limited to – keeping dirt and other contaminants
out of the system, cleaning systems after a failure.
The importance of following manufacturer equipment recommendations is
established.
Range
includes but is not limited to – oil specification, oil filter and oil
change intervals, using approved high pressure components.
 New Zealand Qualifications Authority 2016
23927 version 1
Page 3 of 4
2.3
Safety rules are explained in relation to working with automotive hydraulic
equipment in accordance with service information and legislative requirements.
Range
includes but is not limited to – relieving system pressure before
disconnecting oil lines; leaving the vehicle, machine, and/or unit
unattended; working and blocking a raised system; removing
cylinders and rams; transporting a vehicle, machine, and/or unit;
checking line connections; using lifting equipment; observing
safety signs on the vehicle, machine, and/or unit; wearing
protective equipment (glasses, protective footwear, hard hat, no
loose clothing); making repairs with the vehicle, machine, and/or
unit parked on a level surface and blocked to prevent rolling;
lowering vehicle, machine, and/or unit attachments to the ground;
avoiding contact with hot fluids and parts.
Element 3
Demonstrate knowledge of hydraulic systems and components used in automotive
applications.
Performance criteria
3.1
A layout of main hydraulic components used in an automotive equipment
application is described in accordance with service information.
Range
3.2
Flow diagrams are shown for working hydraulic circuits in accordance with
service information.
Range
3.3
vented and closed.
The purpose and operation of hydraulic pumps are described in accordance
with service information.
Range
3.5
hydraulic jack, hydrostatic drive (open and closed circuits).
The function and design of hydraulic tanks or reservoirs are described in
accordance with service information.
Range
3.4
hydraulic motor, hydraulic tank, hydraulic pump, control valves,
hydraulic cylinder.
gear, piston, vane.
The types and operation of control valves are described in accordance with
service information.
Range
directional, pressure, flow-volume, pilot, open and closed centre.
 New Zealand Qualifications Authority 2016
23927 version 1
Page 4 of 4
3.6
The function and operation of actuators are described in accordance with
service information.
Range
3.7
The purpose of accumulators used in an automotive hydraulic circuit is
described in accordance with service information.
Range
3.8
pneumatic gas filled.
The functions and operation of hydraulic oil, filters, and coolers are described in
relation to automotive hydraulic systems.
Range
3.9
linear (single acting and double acting cylinders and rams), rotary
(hydraulic motors – gear, vane, piston).
oil acting as a control medium, cooling, lubricating, cleaning.
The construction of hydraulic lines, hoses, and pressure fittings, and methods of
installation are described in relation to heavy equipment hydraulics.
Range
low pressure, high pressure.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated)
janet.lane@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016