ACTUATOR GP-ROTARY 3378842 - Caterpillar

Introduction
Illustration 1 g01902977
This module discusses the features and operation of the power train hydraulic system. In addition, the major power train components are discussed.The power train is a hydromechanical system. The hydromechanical system refers to the hydrostatic transmission that is coupled to the transmission gearbox and the drive train. The power train is controlled and monitored by the IQAN.The hydrostatic transmission is made up of the hydrostatic pump and the hydrostatic motor. The transmission gearbox contains the intermediate gears that transfer power to either first gear or second gear. The drive train is made up of the drive shafts, the differentials, the bogies, and the final drives.The hydrostatic transmission controls the direction of travel of the machine. The high/low valve that is mounted on the transmission controls the gear selection.The power train allows the operator to control the speed of the machine and the direction of the machine. The power train system also allows the operator to control the differential lock, the access ladder, the parking brake, and the service brakes.
Illustration 2 g01902994
(1) Implement pump (Implement) (2) Dynamic braking manifold (3) Hydrostatic pump (4) Fan pump (5) Hydrostatic filter (Charge pressure) (6) Hydraulic oil tank (7) Main valve (Implement control) (8) Filter (Pilot) (9) Manifold (Rear brake and differential lock) (10) Brake accumulator (Rear) (11) Service brake cylinder (12) Parking brake cylinder (13) Brake cylinder (14) Differential (15) Engine (Diesel) (16) Hydraulic oil cooler (17) Bogie (18) Final drive (19) Drive shaft (20) Transmission gearbox (21) Hydrostatic motor (22) Oil filter (Charging system) (23) Manifold (Front brake and differential lock) (24) Ladder cylinder (25) Brake accumulator (Front)Power from diesel engine (15) is sent from the flywheel to a pump drive. The pump drive is splined to implement pump (1). Implement pump (1) is splined to hydrostatic pump (3) .The pump drive causes implement pump (1) and hydrostatic pump (3) to rotate. Hydrostatic pump (3) converts mechanical power from the flywheel to hydraulic power.Hydrostatic pump (3) is connected to hydrostatic motor (21). The pressure side and the return side of both hydrostatic pump (3) and hydrostatic motor (21) are connected. This makes a closed loop circuit.The connection between hydrostatic pump (3) and hydrostatic motor (21) makes up the hydrostatic drive of the power train.Hydrostatic motor (21) is connected to transmission gearbox (20) by splines. Hydrostatic motor (21) converts hydraulic power into mechanical power.The mechanical power from hydrostatic motor (21) flows through the speed solenoid valves of transmission gearbox (20) to the output transfer gears. The transfer gears send power to the front differential and the rear differential via drive shafts (19). The bevel gear and pinion of each differential sends the power to each bogie (17) .Each bogie (17) is connected to two final drives (18) through a series of gears. The gears in the bogies transfer power to both final drives (18). The final drives (18) are bolted to the wheels. The final drive sends power to the wheel.The hydraulic oil tank (implement system) supplies oil to