HEAVY MOBILE EQUIPMENT MECHANIC, WG-5803-10: Must have at least 18 months experience or training leading to a thorough knowledge of the mechanical makeup, operation, and working relationships of complex systems, assemblies, and parts for a variety of combat, tactical, commercial, special purpose vehicles, and equipment; Ability to diagnose, repair, overhaul, and modify a variety of combat, tactical, commercial, special purpose vehicles, and equipment; Knowledge of electrical, electronic, hydraulic, pneumatic, and other non-mechanical systems that have a functional relationship and effect on the operation of mechanical systems; Knowledge of hydraulic lifting, loading, turning, and positioning systems and their mechanical, hydraulic, pneumatic, electrical, and electronic controls; Basic knowledge of electronics, sufficient to identify and replace defective components, such as sensors, diodes, and circuit boards; Ability to repair or overhaul major components such as diesel, multi-fuel or gasoline engines, turbine engines, automatic and manual transmissions, drive line assemblies, electrical and electronic systems and accessories, fuel injection systems, and emission control systems. The primary purpose of the HEAVY MOBILE EQUIPMENT MECHANIC, WG-5803-10, is to maintain, troubleshoot, overhaul, repair, modify, and inspect heavy mobile equipment, various support equipment, and special purpose vehicles such as; fuel dispensing trucks, refueling equipment, crash/structural firefighting equipment and pump trucks, forklifts, materiel handling, aircraft cargo loaders, aircraft and equipment tow tractors, large runway snow removal vehicles, aircraft de-icing equipment, sweepers, bulldozers, mobile cranes, road graders, heavy construction and earth moving vehicles, backhoes, front end loaders, excavators, trenchers, and tactical/armored protected vehicles.