PIN 0774905 - Caterpillar

Illustration 1 g00590112
Swing Frame (1) Case drain port (2) Pilot lines (swing brake release) (3) Lines (manifold section) (4) Swing brakes (5) Left swing motor (6) Right swing motor (7) Lines (directional control valve)The two 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. The oil flows from the return port to the swing crossover relief valve and back to the tank.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.