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Elements and Performance Criteria

  1. Prepare to diagnose and repair heavy vehicle mechanical connections
  2. Diagnose mechanical connection system
  3. Repair mechanical connection system
  4. Complete work processes
  5. Prepare to diagnose and repair heavy vehicle mechanical connections
  6. Diagnose mechanical connection system
  7. Repair mechanical connection 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.

Mechanical connections of heavy vehicles and trailers must include:

fifth wheel assemblies

king pins and upper couplers

landing gear

pintle hook and drawbar.

Diagnostic tests must include:

checking for slack in the fifth wheel operation when connected to a trailer

inspecting top plate and brackets for cracks

inspecting the fifth wheel and mounting plate welds

checking fifth wheel operation using a lock tester.

Safety requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for:

lifting and supporting heavy vehicles and trailers

safely manoeuvring heavy vehicles and trailers.

Environmental requirements must include:

procedures for safely handling and disposing of lubricants.

Post-repair testing must include:

engaging fifth wheel jaws or locks

checking clearances according to manufacturer specifications.


Performance Evidence

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

diagnose and repair a fault in two of the following mechanical connections of a heavy vehicle and trailer:

fifth wheel assembly

king pins and upper couplers

pintle hook and drawbar

landing gear

diagnose and repair a fault in both of the following:

electrical connections of a heavy vehicle and trailer

pneumatic connection of a heavy vehicle and trailer.


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 mechanical connections of heavy vehicles and trailers, including procedures for:

lifting and supporting heavy vehicles and trailers

safely manoeuvring heavy vehicles and trailers

environmental requirements, including procedures for safely handling and disposing of lubricants

application, purpose and operation of mechanical connections of heavy vehicles and trailers, including:

fifth wheel assemblies

king pins and upper couplers

pintle hook and drawbar

landing gear

electrical connections

pneumatic connections

types and applications of fifth wheel lubricants

diagnostic testing procedures for mechanical connection of heavy vehicles and trailers, including:

checking for slack in the fifth wheel operation when connected to a trailer

inspecting top plate and brackets for cracks

inspecting the fifth wheel and mounting plate welds

checking fifth wheel operation using a lock tester

testing electrical connections

testing pneumatic connections

repair and adjustment procedures for mechanical connection of heavy vehicles and trailers, including:

fifth wheel assembly

king pins and upper couplers

pintle hook and drawbar

landing gear

electrical connections

pneumatic connections

post-repair testing procedures for mechanical connection of heavy vehicles and trailers.