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Elements and Performance Criteria

1. Prepare to diagnose and repair heavy commercial vehicle final drive assembly
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
2. Diagnose final drive assembly
   • Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures
3. Repair final drive assembly
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and checked according to manufacturer procedures
   • 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
   • 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
   • Final inspection is made to ensure work is to workplace expectations and vehicle or assembly is presented ready for use
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures
   • Workplace documentation is processed according to workplace procedures
5. Prepare to diagnose and repair heavy commercial vehicle final drive assembly
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
6. Diagnose final drive assembly
   • Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures
7. Repair final drive assembly
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and checked according to manufacturer procedures
   • 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
   • 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
8. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and vehicle or assembly is presented ready for use
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures
   • Workplace documentation is processed according to workplace procedures

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 requirements must include:	work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for: isolating and stabilising vehicles lifting and supporting final drive assemblies.
Environmental requirements must include:	procedures for trapping, storing and disposing of oil released from final drive assemblies.

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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 heavy commercial vehicle final drive assembly and:

undertake a complete dismantle and reassembly of a crown wheel and pinion final drive assembly

remove, refit or replace one final drive assembly

remove, refit or replace one rear axle wheel bearing assembly.

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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 final drive assemblies, including procedures for:

isolating and stabilising vehicles

lifting and supporting final drive assemblies

environmental requirements, including procedures for trapping, storing and disposing of oil released from final drive assemblies

operating principles of heavy commercial vehicle final drive assemblies and associated components, including:

final drive gears, including:

gear types

gear ratios and torque reduction and multiplication

differential function

application, purpose and operation of heavy commercial vehicle final drive assemblies and components, including:

single reduction

two-speed reduction

double reduction

tandem drive

power divider

differentials, including limited slip differentials

axle shafts and bearings

diagnostic testing procedures for heavy commercial vehicle final drive assemblies, including:

road-testing procedures, including:

final drive assembly noise diagnosis

final drive assembly operation

pre-dismantling inspection procedures

repair procedures for heavy commercial vehicle final drive assemblies, including procedures for:

dismantling assemblies

inspecting assemblies

reassembling and adjusting the following components:

pinion depth

pinion bearing preload

crown wheel and pinion backlash

side bearing preload

crown wheel and pinion tooth contact

post-repair testing procedures for heavy commercial vehicle final drive assemblies.

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