Diesel Motor Mechanic (Heavy Commercial Vehicle)

ANZSCO Code: 321212

Heavy Commercial Vehicle Mechanics are responsible for maintaining, testing, we and repairing diesel engines and mechanical components of large road transport equipment such as goods trucks and passenger buses.

Occupation description

Heavy Commercial Vehicle Mechanics are responsible for maintaining, testing, and fixing diesel engines and mechanical parts of big trucks and buses used for transporting goods and people.

Their duties include:

  • Finding and diagnosing mechanical and electrical issues in engines and parts.
  • Taking apart engine assemblies, transmissions, and other components to check them.
  • Fixing or replacing worn-out or faulty parts and putting everything back together.
  • Regular maintenance like changing oil and tuning engines ensures vehicles run smoothly and meet pollution rules.
  • Test and adjust parts after fixing them to make sure they work correctly.
  • Using computers to help diagnose and test parts.

Sometimes, Heavy Commercial Vehicle Mechanics also:

  • Check vehicles and give certificates saying they’re safe to drive or list any repairs needed.
  • Help out when vehicles break down.

Note: This job is for mechanics who work with big trucks and buses in places like car repair shops. It doesn’t include mechanics working with farm equipment or forklifts or specializing in air conditioning or brakes.

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    Our Amazing Features

    ✅ Australia Based Company
    ✅ Unlimited Free Modification or Corrections
    ✅ Negative Assessment? Get Refund within 2 hours
    ✅ 24*7 Live Chat, Phone Call and WhatsApp Facility
    ✅ Beat the value offer
    ✅ Complete CDR Before the Agreed Due Date

    How will I be assessed?

    Diesel Motor Mechanic (Heavy Commercial Vehicle)

    Stage 1

    Documentary Evidence Assessment

    We’ll assess your documents to ensure they meet the requirements for employment, training, and skills needed as a Diesel Motor Mechanic (Heavy Commercial Vehicle).

    Here’s what you need to know:

    • Download the Evidence guide to know what documents to include.
    • If you’re in Pathway 1, find information on assessment for your specific occupation.
    • Check the Video and Photo guide.
    • Submit a Supervisor report.
    • For employment experience requirements in Pathway 1, refer to the Pathway 1 Employment Experience Guidelines.
    • If you’re applying for the Pathway 2 assessment, read the Pathway 2 Candidate Guide.

    Stage 2

    Technical Assessment

    If you pass Stage 1, you’ll have a technical interview with our assessor. The interview will be in English, and no interpreters are allowed.

    For details about the technical interview, check the Stage 2 Assessment Guide.

    Looking for expert CDR Writer for Engineers Australia?

    Creating a CDR Report may be difficult due to Engineers Australia’s standards and rules ( EA ). Our experienced engineers have assisted many people in obtaining approval for their report from the EA via the use of powerful projects.

    What skills and knowledge do I need?

    The UEE32220 Certificate III in Air Conditioning and Refrigeration is the qualification that is pertinent to this position.

    To receive this certification, you will need to prove that you are proficient in the following competency units. Each unit of competency defines a subset of the knowledge and abilities needed in Australian businesses.  

    Core Units




    Follow environmental and sustainability best practices in an automotive workplace.


    Follow safe working practices in an automotive workplace


    Test and repair basic electrical circuits


    Test, charge and replace batteries and jump-start vehicles


    Diagnose and repair charging systems


    Diagnose and repair starting systems


    Carry out servicing operations


    Develop and carry out diagnostic test strategies


    Diagnose and repair cooling systems


    Use and maintain tools and equipment in an automotive workplace


    Inspect and service final drive assemblies


    Diagnose and repair dynamic vehicle control systems


    Diagnose and repair compression ignition engine management systems


    Diagnose and repair heavy vehicle compression ignition engines


    Diagnose and repair engine forced-induction systems


    Inspect and service hydraulic systems


    Diagnose and repair heavy vehicle air braking systems


    Diagnose and repair heavy commercial vehicle steering systems


    Diagnose and repair heavy commercial vehicle suspension systems


    Diagnose and repair heavy vehicle drive shafts


    Diagnose and repair heavy vehicle emission control systems


    Inspect and service diesel fuel injection systems

    Elective Units




    Read and respond to automotive workplace information


    Communicate effectively in an automotive workplace 


    Inspect and service diesel fuel injection systems 


    Inspect and service cooling systems


    Inspect and service braking systems


    Inspect and service steering systems


    Inspect and service suspension systems


    Inspect and service engines


    Use and maintain measuring equipment in an automotive workplace


    Inspect and service manual transmissions


    Diagnose and repair heavy vehicle clutch systems


    Select and use bearing, seals, gaskets, sealants and adhesives


    Diagnose and repair heavy vehicle manual transmissions


    Inspect and service automatic transmissions

    All required and elective competency units must be completed successfully.

    All of the prerequisite units, as well as the core and elective units of competency, must be shown by you.

    NOTE: denotes the presence of a prerequisite in a unit.

    How to Apply

    If you work as a tradesperson, someone with experience in your industry who is familiar with your credentials will assess your abilities and knowledge. As Australia’s leading trade assessment organization, cdrforAustralia can assess 27 different trade vocations.

    Step 1

    Verify if you are qualified to apply for a Trade Skills Evaluation.

    Step 2

    Recognize the Evaluation Procedure

    Step 3

    Verify the kind of proof that you could be required to submit.

    Step 4

    Find out how much your trade skills assessment will cost upfront.

    Step 5

    Apply now.

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