How to perform a truck PM service
Preventive maintenance catches problems before they leave a truck stranded.
7 steps →How-to guides
Diesel Mechanic How-To Guides
Step-by-step guides to common diesel mechanic tasks: the practical side of the job.
Common diesel mechanic tasks
Step-by-step overviews of tasks diesel mechanics perform regularly. Use them to understand the job, prepare for training or refresh your memory.
How to check air brake pushrod stroke
Out-of-adjustment brakes are one of the most common roadside violations.
7 steps →How to read heavy-duty fault codes
Diagnostic software turns the truck’s data into clues.
6 steps →Before you practice
Learn every core task
Our Diesel Mechanic training walks through these procedures and more, alongside vocabulary, safety and career-launch lessons.