PLATE-VALVE 0775047 - Caterpillar

Illustration 2 g03078917
(12) Main control valve
(14) Swing control valve
(22) Swing priority valveSwing Right
The oil delivery for the swing hydraulic circuit is supplied by idler pump (32) only. When either one of the joysticks (swing, stick, boom and/or bucket) is moved from the NEUTRAL position, swing parking brake (4) is released. Motor rotary group (5) starts to rotate. When the joystick for the swing function is moved from the NEUTRAL, swing priority valve (22) is activated. The swing motor is mounted on top of the swing drive. The swing drive is installed on the upper structure. The swing drive reduces the motor speed by two stages. The swing drive rotates the upper structure.Reference: For more information concerning the operation of the swing motor, refer to Systems Operation, "Swing Motor".Reference: For more information concerning the operation of the swing drive, refer to Systems Operation, "Swing Drive".Reference: For more information concerning the operation of the swing parking brake and the solenoid valve for the swing parking brake, refer to Systems Operation, "Pilot Valve (Swing Parking Brake)".When the joystick is moved to the SWING RIGHT position, pilot oil from pilot control valve (27) flows through line (11) to swing control valve (14) and the pilot oil shifts the swing control valve downward. Oil from idler pump (32) flows through parallel feeder passage (21) to load check valve (19). Then, the oil flows from load check valve (19) through passage (18) to swing control valve (14). The oil flows through the swing control valve through passage (16) to line (8). The oil flows through line (8) to motor rotary group (5). The motor rotary group rotates and the upper structure swings to the right.Return oil from motor rotary group (5) flows through line (9) through passage (15) to swing control valve (14). The oil flows from the swing control valve through passage (20) to the hydraulic tank.Swing Left
When the joystick is moved to the SWING LEFT position, pilot oil from pilot control valve (27) flows to swing control valve (14) and the pilot oil shifts the swing control valve upward. Oil from idler pump (32) flows through parallel feeder passage (21) to load check valve (19). Then, the oil flows from load check valve (19) through passage (18) to swing control valve (14). The oil flows through the swing control valve through passage (15) to line (9). The oil flows through line (9) to motor rotary group (5). The motor rotary group rotates and the upper structure swings to the left.Return oil from motor rotary group (5) flows through line (8) through passage (16) to swing control valve (14). The oil flows from the swing control valve through passage (20) to the hydraulic tank.Swing Parking Brake
ON Position
Illustration 3 g06009822
Pilot manifold
(30) Solenoid valve for the swing parking brake
(31) Pilot manifoldPilot oil from pilot pump (34) flows through pilot manifold (31) to solenoid valve (30). Pilot oil also flows to