Heavy Diesel Mechanic
Service and repair diesel engines, trucks and heavy vehicles using mechanical, diagnostic and technical skills.
What They Do
Heavy Diesel Mechanics maintain, diagnose and repair diesel-powered trucks, buses and other heavy vehicles.
They work on diesel engines as well as transmissions, steering, suspension, braking and associated mechanical systems. Modern vehicles also rely heavily on electronic control systems, so technicians increasingly use computers and diagnostic equipment alongside traditional mechanical tools.
JSA lists fault diagnosis, dismantling engines and transmissions, replacing defective components, reassembling equipment and computer-assisted testing among the occupation’s main duties.
Depending on the employer, Heavy Diesel Mechanics may work on highway trucks, buses, construction machinery or equipment supporting transport and industrial operations.
Who This Career Suits
This career suits people who enjoy machines, practical problem solving and understanding how complex mechanical systems work.
Heavy Diesel Mechanics need strong mechanical aptitude and patience when diagnosing faults that may not be immediately obvious.
The work can be physically demanding and sometimes dirty, but increasingly sophisticated electronics and computer diagnostics mean it is also becoming more technologically advanced.
Key Skills
Mechanical Skills, Problem Solving, Diagnostics, Technical Skills, Attention to Detail, Safety Awareness, Practical Skills, Technology
Work Environment
Workshop, Industrial, Transport, Physical, Team-Based
Education & Training
The principal Australian trade qualification is the AUR31120 Certificate III in Heavy Commercial Vehicle Mechanical Technology.
It is designed for technicians servicing and repairing heavy commercial vehicles and is suitable for an Australian apprenticeship pathway.
Training covers areas such as:
diesel engines, braking systems, steering and suspension, transmissions, electrical systems, electronic diagnostics and workplace safety.
Most people enter through an apprenticeship that combines paid employment with formal vocational training.
JSA data strongly reflects this pathway: around 72% of Diesel Motor Mechanics hold a Certificate III or IV qualification.
Career Changer Pathway
Heavy diesel mechanics can be a logical career change for people coming from automotive work, agriculture, transport, manufacturing, mining, mechanical maintenance or other trades.
A qualified Motor Mechanic may already possess many transferable skills but may require additional training and workplace experience with heavy commercial vehicles and diesel systems.
Someone without mechanical trade experience would normally enter through an apprenticeship.
Early Career
Apprentices and newly qualified Heavy Diesel Mechanics develop experience performing servicing, inspections, component replacement and fault diagnosis.
They work alongside experienced tradespeople while learning increasingly complex diesel, hydraulic, electrical and electronic systems.
Mid Career
Experienced mechanics independently diagnose and repair complex faults and may specialise in particular vehicle or equipment types.
They can work across:
heavy road transport, buses, fleet maintenance, construction equipment, mining support or specialised diesel systems.
Some roles involve field-service work, where mechanics travel to equipment rather than working exclusively in a workshop.
Senior / Veteran Career
Experienced tradespeople can progress into Senior Technician, Leading Hand, Workshop Supervisor, Fleet Maintenance Supervisor or Service Manager roles.
Others specialise in advanced diagnostics, field service or heavy equipment, become technical trainers or establish their own diesel-repair businesses.
Mining and remote-site experience can also lead to particularly specialised and highly paid opportunities.
Salary Guide
Early Career
75000
Mid Career
100000
Senior / Veteran
140000
Indicative annual salary (AUD)
Indicative annual salary (AUD)
Indicative annual salary (AUD)
Salary data source:
Indeed Australia
Salary data source URL:
Date :
8 October 2026 at 12:00:00 am
Career Outlook
Diesel Motor Mechanic appears as a shortage occupation in JSA’s latest 2025 Skills in Demand reporting and was recorded as being in shortage across 2023, 2024 and 2025.
JSA also identifies the broader Motor Mechanics group as experiencing a long training gap — demand for qualified tradespeople cannot be quickly addressed because producing new workers requires several years of apprenticeship training.
The broader Motor Mechanics workforce currently contains about 112,600 workers and recorded annual employment growth of approximately 1,800.
Job Outlook :
Outlook Source :
Strong
Where do I go from here?
Explore Training
Find courses, qualifications and training pathways for this career.
Explore Jobs
See current opportunities and understand what employers are looking for.
Similar Careers
Discover other careers that use similar skills and interests.