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					NZQA Expiring unit standard                                                          931 version 5
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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          forces, energy transfer, work, power.

1.2         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                    New Zealand Qualifications Authority 2011
(Incorporated)
SSB Code 101542
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          hydraulic motor, hydraulic tank, hydraulic pump, control valves,
                           hydraulic cylinder.

2.2         Equipment hydraulic system requirements are calculated.

            Range          cycle times, power requirements, cylinder thrust output.

2.3         Flow diagrams are shown for working hydraulic circuits.

            Range          hydraulic jack, hydrostatic drive (open and closed circuits).

2.4         The function and design of hydraulic tanks or reservoirs are described
            according to manufacturer’s hydraulic manual descriptions.

            Range          vented and closed.

2.5         The purpose and operation of hydraulic pumps are described according to
            manufacturer’s hydraulic manual descriptions.

            Range          gear, piston, vane.

2.6         The types and operation of control valves are described according to
            manufacturer’s hydraulic manual descriptions.

            Range          directional, pressure, flow-volume, pilot, open and closed centre.

2.7         The function and operation of actuators are described according to
            manufacturer’s hydraulic manual descriptions.

            Range          linear (single acting and double acting cylinders and rams), rotary
                           (hydraulic motors – gear, vane, piston).

2.8         The purpose of accumulators used in an automotive hydraulic circuit is
            described according to manufacturer’s hydraulic manual descriptions.

            Range          pneumatic gas filled.

2.9         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                   New Zealand Qualifications Authority 2011
(Incorporated)
SSB Code 101542
NZQA Expiring unit standard                                                          931 version 5
                                                                                       Page 3 of 5

2.10        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          pictorial, cut-away, graphical.

3.2         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          keeping dirt and other contaminants out of the system, cleaning
                           systems after a failure.

4.2         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                    New Zealand Qualifications Authority 2011
(Incorporated)
SSB Code 101542
NZQA Expiring unit standard                                                             931 version 5
                                                                                          Page 4 of 5

4.3         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          API (American Petroleum Institute) classification, SAE (Society of
                           Automotive Engineers) classification, ISO classification,
                           manufacturer's classification, compatibility of oil types.

5.2         Oil additives for hydraulic systems are described according to oil company
            descriptions.

            Range          anti-foam, anti-wear, anti-oxidants, extreme pressure qualities,
                           viscosity improvers, viscosity stabilisers.

5.3         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                       New Zealand Qualifications Authority 2011
(Incorporated)
SSB Code 101542
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                 New Zealand Qualifications Authority 2011
(Incorporated)
SSB Code 101542

				
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