TURBOCHARGER GP 9Y6593 - Caterpillar

Illustration 1 g00759375
(1) Housing for actuator piston. (2) Actuator piston. (3) Barrel. (4) Housing. (5) Port plate. (6) Head. (7) Input shaft. (8) Passage for the main loop. (9) Passage. (10) Swashplate. (11) Slipper plate. (12) Piston. (13) Spring. (14) Passage for the main loop.The hydrostatic piston pump is a variable displacement piston pump with a maximum displacement of 45 cc/rev (2.75 in3/rev). The pump is driven from the engine flywheel by a coupling that is fastened to the splines of the pump input shaft.The shaft (7) has external splines. The barrel (3) has internal splines. The shaft connects to the barrel via the splines. There are nine pistons (12) in the barrel. The pistons attach to the slipper plate (11). The slipper plate (11) contacts the swashplate (10). The slipper plate matches the angle of the swashplate. The pistons slide in the barrel as the slipper plate matches the angle of the swashplate. When you operate the engine, the shaft, the barrel, the slipper plate, and the pistons rotate.The port plate (5) and the swashplate (10) are fastened to housing (4). When the engine is in operation, the port plate (5) and the swashplate (10) do not rotate.If the swashplate angle is at zero, the pistons do not move in and out of the barrel. There is no oil flow. Charge oil from the charge pump maintains oil pressure in the pump in order to keep the barrel full of oil. Charge oil from the charge pump lubricates the pump components. Charge oil from the charge pump makes up for the normal, internal loss of oil that is due to leakage.The length of the stroke of the pistons (12) is changed when the swashplate (10) is turned on the axis. At the neutral position, the stroke of the piston and the delivery of the oil is zero. At maximum inclination of 15°, piston stroke is at the maximum.The position of the swashplate (10) is controlled by the signal oil from the hydrostatic joystick control and the actuator piston (2). Signal oil from the speed sensing valve flows to the interlocking manifold valve. The signal oil flows through the interlocking manifold valve to the hydrostatic joystick control. When the operator moves the hydrostatic joystick control, the signal oil flows to the actuator piston (2). The actuator piston moves the swashplate.The pump speed and the drive pressure control the swashplate. Higher pump speed and higher drive pressure will destroke the swashplate. Higher signal pressure at the actuator piston (2) will upstroke the swashplate.The position of the swashplate (10) determines the direction of flow in the two passages of the main loop (8) and (14). The swashplate (10) is at the maximum position. The slipper plate (11) matches the angle of the swashplate. The pistons (12) match the angle of the slipper plate. The pistons move in and out of the barrel (3). As the pistons move out of the barrel, oil flows behind the pistons. This oil is supplied under