23928 version 1
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Demonstrate knowledge of automotive hydraulic circuit diagrams and
oil requirements
Level
3
Credits
3
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 circuit diagrams, and
hydraulic oil requirements for automotive or related equipment.
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
Recommended: Unit 23927, Demonstrate knowledge of
automotive hydraulic principles, practices, systems and
components, or demonstrate equivalent knowledge and
skills.
Replacement information
This unit standard and unit standard 23927 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
23928 version 1
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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.
3
Hydraulic oil standards can be sourced from the following organisations:
American Petroleum Institute (API) http://www.api.org;
Society of Automotive Engineers (SAE) http://www.sae.org;
International Standards Organisation (ISO) http://www.iso.org.
Elements and performance criteria
Element 1
Demonstrate knowledge of hydraulic circuit diagrams.
Performance criteria
1.1
Types of hydraulic circuit diagrams are identified, and their use described in
accordance with service information.
Range
1.2
pictorial, cut-away, graphical.
The meaning of symbols used for hydraulic components are identified in
accordance with service information.
Range
includes but is not limited to ISO symbols.
1.3
Assembled circuits are drawn using graphical symbols that relate to automotive
hydraulics in accordance with service information.
1.4
Pilot control circuits are interpreted in accordance with service information.
Range
1.5
electric, hydraulic, pneumatic.
Procedures for calculating hydraulic equipment system requirements are
described in accordance with service information.
Range
cycle times, power requirements, cylinder thrust output.
 New Zealand Qualifications Authority 2016
23928 version 1
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Element 2
Demonstrate knowledge of hydraulic oil requirements for automotive or related equipment.
Performance criteria
2.1
Hydraulic system oil specification requirements are identified in accordance with
oil standards.
Range
2.2
Hydraulic oil types are identified in accordance with oil company descriptions.
Range
2.3
mineral, synthetic.
Oil additives for hydraulic systems are described in accordance with oil
company descriptions.
Range
2.4
API classification, SAE classification, ISO classification,
manufacturer classification, compatibility of oil types.
includes but is not limited to – anti-foam, anti-wear, anti-oxidants,
extreme pressure qualities, viscosity improvers, viscosity
stabilisers.
Oil filtration requirements for hydraulic systems are described in accordance
with service information.
Range
screen filters, full-flow filters, by-pass filters.
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