VALVE GP-PUMP CONTROL 4452058 - Caterpillar

Illustration 2 g03419571
(11) Main control valve (15) Swing control valve (24) Swing priority valveReferenceFor more information concerning the operation of the swing motor, refer to Systems Operation, "Swing Motor".ReferenceFor more information concerning the operation of the swing drive, refer to Systems Operation, "Swing Drive".ReferenceFor 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)".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) is allowed to rotate. When the joystick for the swing function is moved from the NEUTRAL, swing priority valve (24) 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.Swing Right
When the joystick is moved to the SWING RIGHT position, pilot oil from pilot control valve (29) flows through line (13) to shift swing control valve (15) downward. Oil from idler pump (32) flows through parallel feeder passage (22) to load check valve (20) . The oil then flows through passage (19) , through swing control valve (15) , through passage (17) , and into line (8) . The hydraulic oil flows through line (8) to