Corrects vehicle deficiencies by removing, repairing, adjusting, overhauling, assembling, disassembling, and replacing major assemblies, sub- assemblies, components, parts, or systems, such as, brakes, hubs, bearings, seals, electrical, air conditioning, fuel, steering, hydraulics; control linkages, clutches, and traction units. Required to have demonstrated knowledge of vehicle and equipment theory, principles and repair relating to diesel engines, air, electrical, mechanical, and hydraulic systems.