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Elements and Performance Criteria

  1. Prepare to diagnose and repair a heavy commercial vehicle steering system
  2. Diagnose steering system
  3. Repair steering system
  4. Complete work processes
  5. Prepare to diagnose and repair a heavy commercial vehicle steering system
  6. Diagnose steering system
  7. Repair steering system
  8. Complete work processes

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for working with high pressure steering systems

environmental requirements, including procedures for trapping, storing and disposing of power steering hydraulic fluid released from steering systems.


Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose and repair a fault in one of the following heavy commercial vehicle steering systems:

electronically assisted steering

hydraulic power assisted steering

diagnose and repair a fault in three of the following heavy commercial vehicle steering components:

power steering pump

hydraulic and electronic valves

tie rods and linkages

king pin

front wheel bearings.


Knowledge Evidence

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing heavy commercial vehicle steering systems, including procedures for working with high pressure steering systems

environmental requirements, including procedures for trapping, storing and disposing of power steering hydraulic fluid released from steering systems

operating principles of heavy commercial vehicle steering systems and associated components, including:

manual steering systems

power assisted steering systems

application, purpose and operation of heavy commercial vehicle steering systems and components, including:

manual steering systems, including:

steering box

steering column

tie rods and linkages

king pins

wheel bearings

hydraulic power assisted steering systems, including:

integral piston steering box

power steering pump

hydraulic and electronic valves

twin axle steering systems

electronically assisted steering systems

identification, function and basic operating principles of steering angles, including:

Ackermann principle of steering

toe-in and toe-out

toe-out on turns

caster

camber

steering axis inclination

diagnostic testing procedures for heavy commercial vehicle steering systems, including:

operational testing

hydraulic steering system testing

electronic and load sensing steering testing

analysing component wear analysis

repair procedures for heavy commercial vehicle steering system components, including:

power steering pump

steering box

steering column

king pin

electronically assisted steering

tie rods and linkages

wheel bearings

post-repair testing procedures for heavy commercial vehicle steering systems.