Corrects vehicle deficiencies by removing, repairing, adjusting, overhauling, assembling, disassembling, and replacing major assemblies, sub-assemblies, components, parts, or systems, such as, power and drive trains, electrical, air conditioning, fuel, emission, brake, steering, hydraulics; making adjustments and alignments including bearing loads, gear tooth contact, valve mechanisms, governors, oil systems, control linkages, clutches, and traction units Verifies vehicle performance by conducting tests, driving, adjusting controls, and systems. The Lead Diesel Mechanic supervises shop personnel, inspects, diagnoses, repairs, and maintains diesel-powered vehicles and equipment and supervises and coordinates the work of other mechanics, ensuring timely and quality repairs.