18077 version 2

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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.

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 two types of tank.

2.4 Hydraulic pumps are described in terms of operation.

Range three types of pump.

2.5 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.

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 three characteristics.

3.2 The oil additives used are described in terms of purpose.

Range three types of additives.

3.3 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) if you wish to suggest changes to the content of this unit standard.

Ó New Zealand Qualifications Authority 2013