SPACER 9W0632 - Caterpillar

Illustration 1 g00818028
The swing motor functions in order to drive the swing gear and the upper structure. The swing motor is a fixed displacement axial piston motor.The swing motor is made up of the following components: input shaft, anti-slip device, piston, rotary group, control lens and end cover with purging device. The swing system is a closed loop hydraulic system. Return oil is required to be returned to the hydraulic tank through a discharge device that is called the purging pump. When the purging pump is actuated, approximately 4.5 L (1.2 US gal) of oil per minute are discharged via the shuttle valve with a pressure relief valve that is installed in the end cover.Oil from the swing pump directs oil to port (A) or (B). The direction of oil depends on the direction of the swing. Swing pump oil enters the head of the swing motor and the oil passes through the control plate to the barrel.Pump oil in the cylinder barrel acts against the piston. The piston forces the shoe against the lower plate. The piston and the shoe slide along the inclined surface of the lower plate from the top dead center to the bottom dead center. The force that is created by the shoe and the piston against the lower plate causes the cylinder barrel to rotate. As the barrel rotates each piston passes from the inlet side to the outlet side of the control plate. When the pistons pass the outlet port in the control plate oil in the piston chamber is discharged back to the swing pump.The swing motor barrel is splined to the output shaft. Rotation of the barrel transmits torque to the output shaft that sends torque to the swing drive.
Illustration 2 g00818257
The flushing valve directs oil from the swing circuit to the swing motor when the swing circuit is activated. When the swing circuit is not activated, the shuttle valve is in the NEUTRAL position and the oil is blocked by the valve.When the swing circuit is activated, the high pressure oil in the drive loop for the swing circuit shifts the shuttle valve to the right. Low pressure oil in the drive loop for the swing circuit shifts the shuttle valve to the right. Low pressure oil in the drive loop is directed to the tank through an orifice.