 | |
| Illustration 1 | g00629519 |
Inside front of the swing frame (1) Line to case drain (2) Front swing motor | |
 | |
| Illustration 2 | g00629520 |
Inside swing frame (1) Line to case drain (3) Pilot line to swing parking brake (4) Left swing motor (5) Right swing motor | |
The three swing motors are identical. The swing motors are fixed displacement bent axis piston motors. Each motor is operated by oil from the swing piston pumps. A change in the direction of oil flow through the swing motors will not change the amount of torque that is available from the shaft of the swing motor. Oil flow can be in either direction. From the return port, the oil flows to the swing crossover relief valve and back to the tank.
 | |
| Illustration 3 | g00886660 |
Left hand swing motor (6) Speed sensor (swing) | |
The speed sensor for swing is mounted to the left hand swing motor. The speed sensor sends a pulse width modulated signal to the machine control module in order to indicate the speed of the swing motor.
The case drain oil is oil that has leaked from the sliding surfaces and clearances. Case drain oil provides lubrication for the rotating parts. Case drain oil returns to the hydraulic tank through the case drain lines (1) .
Note: Refer to the Hydraulic System System Operation, "Hydraulic Motor Operation" for information on the operation of a hydraulic motor.