18077 version 2
Page 1 of 3
Demonstrate knowledge of hydraulic systems for commercial vehicle
use
Level
2
Credits
4
Purpose
People credited with this unit standard are able to describe: the principles
that apply to the operation of hydraulic systems fitted to commercial vehicles;
components of hydraulic systems used in commercial vehicle applications;
and hydraulic oil and oil filter requirements for commercial vehicle
applications.
Subfield
Commercial Road Transport
Domain
Commercial Road Transport Skills
Status
Registered
Status date
25 May 2007
Date version published
25 May 2007
Planned review date
31 December 2012
Entry information
Open.
Accreditation
Evaluation of documentation by NZQA and industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0092
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard does not address the use of hydraulic braking systems.
2
Definitions
hydraulic system – system which includes the operation of single and double acting
actuators controlled by a single directional control valve;
components – includes pumps, fluid conditioning equipment, pressure relief valves,
directional control valves, flow control valves, actuators, fluid conductors and may
include gauges;
actuator – motor or cylinder that converts hydraulic pressure into useful work;
accumulator – device that stores energy for future use.
 New Zealand Qualifications Authority 2016
18077 version 2
Page 2 of 3
Elements and performance criteria
Element 1
Describe the principles that apply to the operation of hydraulic systems fitted to
commercial vehicles.
Performance criteria
1.1
Hydraulic systems are described in terms of the roles of pressure and flow.
Range
forces, energy transfer, work, power.
Element 2
Describe components of hydraulic systems used in commercial vehicle applications.
Performance criteria
2.1
The main components of hydraulic systems are described in terms of their use
in a commercial vehicle application.
Range
a minimum of five components.
2.2
A hydraulic circuit is described and presented in the form of a flow diagram.
2.3
Hydraulic tanks or reservoirs are described in terms of function and design.
Range
2.4
Hydraulic pumps are described in terms of operation.
Range
2.5
two types of tank.
three types of pump.
Actuators are described in terms of purpose and operation.
Range
two types of cylinder, two types of motor.
2.6
Accumulators used in an automotive hydraulic circuit are described in terms of
purpose and operation.
2.7
Hydraulic oil filters and oil coolers are described in terms of purpose and
operation.
2.8
Hydraulic lines, hoses, and fittings are described in terms of construction.
Range
low pressure, high pressure.
 New Zealand Qualifications Authority 2016
18077 version 2
Page 3 of 3
Element 3
Describe hydraulic oil and oil filter requirements for commercial vehicle applications.
Performance criteria
3.1
Oils used are identified in terms of characteristics.
Range
3.2
The oil additives used are described in terms of purpose.
Range
3.3
three characteristics.
three types of additives.
The oil filters used are described in terms of types.
Range
three types of oil filter.
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 NZ Motor Industry Training Organisation (Incorporated) info@mito.org.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016