Introduction to Heavy equipment, application of Heavy equipments, components, Engine, transmission, axle, Differential, final drive, steering system, Break system , Fuel system, Lubricating system, cooling system, Hydraulic system, Electrical system. Many employees are injured when lift trucks are inadvertently driven off loading docks or lifts fall between docks and an unsecured trailer. Employees are also struck by a lift truck or fall while on elevated pallets and tines. Most incidents also involve property damage, including damage to overhead sprinklers, racking, pipes, walls, and machinery.