2. Performs major repairs by disassembling, replacing worn or broken parts, assembling and adjusting gasoline and diesel engines, clutches, transmissions, drive trains, rear and front ends, suspension systems, electrical and ignition systems, brakes, hydraulic and pneumatic equipment, cooling systems, exhaust and pollution control devices and accessory power equipment. Overhauls, adjusts, maintains and repairs motor driven equipment such as automobiles, trucks, graders, tractors, sweepers, loaders and related mechanical equipment; installs or builds special accessory equipment and attachments.