Military Grades: E-4 through CW3 GENERAL EXPERIENCE: Experience or training which demonstrates knowledge of equipment to be able to do routine jobs, simple preventative maintenance tasks, and can use common tools and equipment in the line of work. SPECIALIZED EXPERIENCE: Must have 1-year at the next lowest WG level or 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.