NZQA Expiring unit standard
931 version 5
Page 1 of 5
Title
Describe the application of hydraulics for automotive heavy
engineering use
Level
4
Credits
8
Purpose
This theory based unit standard is for people in the automotive
engineering and related engineering industries. People
credited with this unit standard are able to demonstrate
knowledge of: hydraulic principles applying to automotive
components; hydraulic systems and components used in
automotive applications; hydraulic circuit diagrams; good work
practices when repairing hydraulic systems; and hydraulic oil
requirements for heavy equipment.
Classification
Motor Industry > Automotive Hydraulics
Available grade
Achieved
Explanatory notes
The following legislation and amendments are required to be consulted where applicable:
–
Health and Safety in Employment Act, 1992.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of hydraulic principles applying to automotive components.
Evidence requirements
1.1
The roles of pressure and flow in automotive hydraulics are described according
to manufacturer’s hydraulic manual descriptions.
Range
1.2
forces, energy transfer, work, power.
The relationship between hydrodynamics and hydrostatics is defined according
to manufacturer’s hydraulic manual definations.
Range
energy principles applicable to automotive components.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
931 version 5
Page 2 of 5
Outcome 2
Demonstrate knowledge of hydraulic systems and components used in automotive
applications.
Evidence requirements
2.1
A layout of main components used in an automotive equipment application is
described according to manufacturer’s hydraulic manual descriptions.
Range
2.2
Equipment hydraulic system requirements are calculated.
Range
2.3
linear (single acting and double acting cylinders and rams), rotary
(hydraulic motors – gear, vane, piston).
The purpose of accumulators used in an automotive hydraulic circuit is
described according to manufacturer’s hydraulic manual descriptions.
Range
2.9
directional, pressure, flow-volume, pilot, open and closed centre.
The function and operation of actuators are described according to
manufacturer’s hydraulic manual descriptions.
Range
2.8
gear, piston, vane.
The types and operation of control valves are described according to
manufacturer’s hydraulic manual descriptions.
Range
2.7
vented and closed.
The purpose and operation of hydraulic pumps are described according to
manufacturer’s hydraulic manual descriptions.
Range
2.6
hydraulic jack, hydrostatic drive (open and closed circuits).
The function and design of hydraulic tanks or reservoirs are described
according to manufacturer’s hydraulic manual descriptions.
Range
2.5
cycle times, power requirements, cylinder thrust output.
Flow diagrams are shown for working hydraulic circuits.
Range
2.4
hydraulic motor, hydraulic tank, hydraulic pump, control valves,
hydraulic cylinder.
pneumatic gas filled.
The functions and operation of hydraulic oil, filters, and coolers are described in
relation to automotive hydraulic systems.
Range
oil acting as a control medium, cooling, lubricating, cleaning.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
2.10
931 version 5
Page 3 of 5
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.
Outcome 3
Demonstrate knowledge of hydraulic circuit diagrams.
Evidence requirements
3.1
Types of hydraulic circuit diagrams are identified, and their use is described
according to manufacturer’s hydraulic manual descriptions.
Range
3.2
pictorial, cut-away, graphical.
The meaning of symbols used for hydraulic components in workshop manuals
is identified.
Range
International Standards Organisation (ISO) symbols.
3.3
Assembled circuits are drawn using graphical symbols that relate to automotive
heavy equipment hydraulics.
3.4
Pilot control circuits are interpreted according to manufacturer’s hydraulic
manual interpretations.
Range
electric, hydraulic, pneumatic.
Outcome 4
Demonstrate knowledge of good work practices when repairing hydraulic systems.
Evidence requirements
4.1
The importance of cleanliness when working with hydraulic systems is
established.
Range
4.2
keeping dirt and other contaminants out of the system, cleaning
systems after a failure.
The importance of following equipment manufacturer's recommendations is
established.
Range
oil specification, oil filter and oil change intervals, using approved
high pressure components.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
4.3
931 version 5
Page 4 of 5
Safety rules are explained in relation to working with automotive hydraulic
equipment.
Range
relieving system pressure before disconnecting oil lines, leaving
the machine unattended, working and blocking a raised system,
removing cylinders and rams, transporting a machine, checking
line connections, using lifting equipment, observing safety signs on
the machine and/or unit, wearing protective equipment (glasses,
protective footwear, hard hat, no loose clothing), making repairs
with the machine parked on a level surface and blocked to prevent
rolling, lowering machine attachments to the ground, avoiding hot
fluids and parts.
Outcome 5
Demonstrate knowledge of hydraulic oil requirements for heavy equipment.
Evidence requirements
5.1
Hydraulic system oil specification requirements are identified.
Range
5.2
Oil additives for hydraulic systems are described according to oil company
descriptions.
Range
5.3
API (American Petroleum Institute) classification, SAE (Society of
Automotive Engineers) classification, ISO classification,
manufacturer's classification, compatibility of oil types.
anti-foam, anti-wear, anti-oxidants, extreme pressure qualities,
viscosity improvers, viscosity stabilisers.
Oil filtration requirements for hydraulic systems are described according to
manufacturer’s hydraulic manual descriptions.
Range
screen filters, full flow filters, by pass filters.
Replacement information
This unit standard has been replaced by unit standard
23927 and unit standard 23928.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
931 version 5
Page 5 of 5
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
29 October 1993
31 December 2016
Review
2
4 October 1996
31 December 2016
Review
3
26 February 1999
31 December 2016
Review
4
21 September 2007
31 December 2016
Rollover
5
19 November 2010
31 December 2016
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (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 granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Consent 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.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016