Diagnosis, removal and replacement of injectors, pistons, liners, cam shafts, cylinder heads, rod and main bearings, oil pans, clutches, fan hubs, differentials, fifth wheels, brakes, changes or recharges batteries, and replaces transmissions and other parts. + Handle basic maintenance of the truck including filling tank with fuel, checking oil, keeping it clean, and making sure required inspections are performed and documented as assigned.