Cert III Heavy Commercial Vehicle study plan

Map all 22 core units into a one-page checklist and rank each unit by your current confidence on a 1-5 scale

Explain the purpose and key components of a heavy commercial vehicle's electrical and starting systems in your own written notes

Identify the workplace health and safety obligations that apply to heavy vehicle maintenance tasks and list five controls you would apply in a workshop scenario

Demonstrate correct use of hand tools and measuring instruments by writing a step-by-step procedure for each of three tools

Describe the operating principles of diesel fuel systems and cooling systems and label the major components on a hand-drawn diagram

Sequence the steps for a routine pre-start inspection of a heavy commercial vehicle and state the pass/fail criterion for each check

Explain how to read and interpret workplace documents such as job cards, service schedules and parts catalogues

Outline the process for isolating and tagging out a vehicle before maintenance work begins

Explain the construction and function of a heavy vehicle manual clutch, including release bearing and pressure plate operation

Describe how a constant-mesh manual gearbox achieves gear selection through sliding collars and synchronisers

Compare the layout of a single countershaft gearbox with a twin countershaft design and note why twin countershafts suit high-torque applications

Practise calculating overall driveline gear ratios from gearbox, final drive and tyre data

Diagnose three common manual transmission faults (hard gear selection, slipping clutch, gear jump-out) by writing a fault tree from symptom to root cause

Explain the correct procedure for measuring and adjusting clutch free play and pedal height

Describe safe removal and refitting sequence for a heavy vehicle gearbox, including lifting and support points

Identify lubricant specifications and inspection points for a manual gearbox and final drive

Explain how a torque converter multiplies torque and describe the role of the stator and lock-up clutch

Describe the function of planetary gear sets and how clutches and bands select gear ratios in an automatic transmission

Outline the operation of electronic control systems governing shift points, line pressure and torque converter lock-up

Identify the correct procedure and precautions for checking automatic transmission fluid level and condition

Diagnose three automatic transmission faults (harsh shifting, slipping, no drive in one range) using a structured symptom-to-cause approach

Interpret fault codes and live data from an electronic transmission controller and explain what each reading indicates

Describe the safe procedure for transmission fluid and filter replacement, including contamination control

Explain retarder operation and how it integrates with the automatic transmission in heavy vehicle applications

Select three general elective units that complement your transmission specialisation and justify each choice in writing

Summarise the key requirements of one elective unit into a study sheet you can revise from

Explain how air braking and suspension systems interact with driveline components during gear changes and load changes

Review your week 1 confidence checklist and re-rate every core unit, flagging any still below 3

Complete a timed 60-question practice set spanning all four domains and record your score per domain

Re-study your two weakest domains using your own notes and fault trees

Recite the manual and automatic transmission diagnostic sequences from memory without notes

Build a one-page formula and specification sheet covering ratios, fluid specs and key tolerances