Diagnoses, maintains, and performs general mechanical repair work on city vehicles, emergency vehicles, mechanical equipment, and other machinery; performs general mechanical repair, maintenance, and preventive maintenance work, which may include dismantling, overhauling, repairing and reassembling engines, rebuilding/replacing transmissions, and rebuilding drive trains, carburetors, differentials, pumps and gear boxes. Performs routine and preventive maintenance on equipment, vehicles and other machinery, which may include inspecting equipment, pumping fuel into vehicles, checking/replacing fluid levels, draining/replacing oil, collecting/recovering freon, changing/replacing filters, lubricating mechanical parts, installing/replacing blades, rotating tires, replacing tires/belts/hoses, checking batteries, greasing equipment, flushing radiators, and performing tune-ups.