COUPLING 6D6177 - Caterpillar

Illustration 1 g02199835
Hydraulic schematic for SWING RIGHT (1) Passage (swing pump supply oil) (2) Motor rotary group (front) (3) Swing parking brake (front) (4) Front swing motor (5) Line (parking brake release pressure) (6) Solenoid valve (swing parking brake) (7) Passage (parking brake release pressure) (8) Passage (swing pump supply oil) (9) Rear swing motor (10) Swing parking brake (rear) (11) Motor rotary group (rear) (12) Passage (return oil) (13) Case drain line (14) Passage (return oil) (15) Relief valve (crossover) (anti-reaction valve) (16) Passage (return oil) (17) Line (swing pump supply oil) (18) Passage (return oil) (19) Passage (swing pump supply oil) (20) Swing control valve (21) Pilot manifold (22) Line (makeup oil) (23) Proportional valve for swing left (24) Back pressure valve (25) Passage (swing pump supply oil) (26) Proportional valve for swing right (27) Line (pilot oil supply to proportional valve) (28) Line (return pilot oil) (29) Line (parking brake release pressure) (30) Main control valve (31) Line (return oil) (32) Bypass valve (33) Back pressure valve (34) Swing pump (35) Line (swing pump supply oil) (36) Hydraulic tank (37) Line (pilot oil supply) (38) Pilot pump (39) Resolver valve (40) Pressure and flow compensator valve (41) Maximum angle actuator (42) Minimum angle actuatorIntroduction
Swing pump (34) supplies oil to rear swing motor (9) and front swing motor (4). The two swing motors are identical in operation. The swing motors have the following differences in construction:
Only the front swing motor is equipped with anti-reaction valve (15) .
Only the rear swing motor is equipped with solenoid valve for the swing parking brake (6) .
Only the rear swing motor is equipped with swing control valve (20) .Swing control valve (20) is mounted on the top of the rear swing motor. The swing control valve operates both swing motors. During a swing operation, swing parking brakes (10) and (3) release in order for the swing motors to operate. Each swing motor is mounted to a swing drive. The swing drives are identical in construction and operation. The swing drives reduce the motor speed to the second stage in order to rotate the upper structure.SWING RIGHT Operation
Illustration 2 g02198455
Swing motor compartment (4) Front swing motor (6) Solenoid valve (swing parking brake) (9) Rear swing motor (31) Line (return oil) (20) Swing control valve The oil delivery from pilot pump (38) flows through line (37), pilot manifold (21), and line (27) to the proportional valve for swing right (26) and the proportional valve for swing left (23) at swing control valve (20). When the swing joystick is in the NEUTRAL position, full pilot pressure at each end of the spool in swing control valve (20) maintains the spool in the center position. The oil delivery from the pilot pump also flows through line (29) to solenoid valve (6) for the swing parking brake.When the swing joystick is moved in order to perform a SWING RIGHT operation, the swing joystick sends an electrical signal input to the machine ECM.The machine ECM sends an electrical