Application
This unit describes the performance outcomes required to diagnose and repair faults in the steering systems of heavy commercial vehicles. It involves preparing for the task, selecting the correct diagnostic procedure, carrying out the diagnosis and the repair, performing post-repair testing, and completing workplace processes and documentation.
It applies to those working in the automotive service and repair industry. The steering systems include those in heavy commercial vehicles. This unit does not apply to agricultural machinery or mobile plant machinery.
No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.
Elements and Performance Criteria
Elements Elements describe the essential outcomes. | Performance Criteria Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold and italicised text is used, further information is detailed in the range of conditions section. |
1. Prepare to diagnose and repair a heavy commercial vehicle steering system | 1.1 Job requirements are determined from workplace instructions 1.2 Diagnostic information is sourced and interpreted 1.3 Diagnostic options are analysed and those most appropriate to the circumstances are selected 1.4 Hazards associated with the work are identified and risks are managed 1.5 Diagnostic tools and equipment are selected and checked for serviceability |
2. Diagnose steering system | 2.1 Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements 2.2 Faults are identified from diagnostic test results and causes of faults are determined 2.3 Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures |
3. Repair steering system | 3.1 Repair information is sourced and interpreted 3.2 Repair options are analysed and those most appropriate to the circumstances are selected 3.3 Repair tools, equipment and materials are selected and checked according to manufacturer procedures 3.4 Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems 3.5 Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified |
4. Complete work processes | 4.1 Final inspection is made to ensure work is to workplace expectations and vehicle is presented ready for use 4.2 Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected 4.3 Tools and equipment are checked and stored according to workplace procedures 4.4 Workplace documentation is processed according to workplace procedures |
Evidence of Performance
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.
Evidence of Knowledge
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.
Assessment Conditions
Assessors must satisfy NVR/AQTF assessor requirements.
Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.
Assessment must include direct observation of tasks.
Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the heavy commercial vehicle steering systems or components that they have worked on, e.g. repair orders.
Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.
The following resources must be made available:
automotive repair workplace or simulated workplace
workplace instructions
manufacturer steering system specifications
heavy commercial vehicle with faults in the power assisted steering systems and components specified in the performance evidence
diagnostic equipment for heavy commercial vehicle steering systems
tools, equipment and materials appropriate for repairing and adjusting heavy vehicle steering systems.
Foundation Skills
This section describes those language, literacy, numeracy and employment skills that are essential to performance and are not explicit in the performance criteria.
Skills | Description |
Learning skills to: | locate appropriate sources of information efficiently. |
Reading skills to: | interpret information from manufacturer and workshop literature when seeking steering system specifications and procedures. |
Writing skills to: | legibly and accurately fill out workplace documentation when reporting diagnostic findings, making repair recommendations, and recording parts and material used. |
Oral communication skills to: | clarify instructions report diagnostic findings and make repair recommendations. |
Numeracy skills to: | understand steering system information in degrees, and metric and imperial units of measurement measure steering system components and use basic mathematical operations, including addition and subtraction, to calculate distances, tolerances and deviations from manufacturer specifications. |
Planning and organising skills to: | plan own work requirements and prioritise actions to achieve required outcomes and ensure tasks are completed within workplace timeframes. |
Technology skills to: | use measuring equipment, such as tape measures, rulers, vernier calipers, micrometers and hydraulic gauges. |
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. |
Sectors
Technical - Steering and Suspension
Competency Field
Mechanical - Heavy Vehicle