As a Heavy Truck Diesel Technician, you will: Diagnose, repair, and maintain heavy-duty trucks and equipment, including diesel engines, chassis, drivetrains, hydraulics, electrical systems, brakes, and related components. At MATE, you’ll work on a variety of heavy-duty trucks and equipment, troubleshooting and repairing everything from diesel engines and electrical systems to hydraulics, drivetrains, chassis, brakes, and other critical components.