PUMP GP-GR B 5576237 - Caterpillar

Hydraulic Schematic For Swing Right
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Hydraulic schematic for return circuit (1) Swing motor (2) Swing parking brake (3) Passage (4) Pressure reducing valve (5) Spool (6) Control valve for swing parking brake (7) Motor rotary group (8) Line (9) Line (10) Main control valves (11) Parallel feeder passage (12) Return passage (13) Pilot line (14) Bucket control valve (15) Boom I control valve (16) Attachment control valve (17) Passage (18) Load check valve (19) Passage (20) Passage (21) Orifice (22) Swing control valve (23) Stick I control valve (24) Pilot passage (25) Pilot passage (26) Drain line (27) Pilot control valve (swing and stick) (28) Pilot line (29) Pilot line (30) Line (31) Passage (32) Line (33) Return line (34) Right pump (35) Left pump (36) Pilot pump (37) Slow return check valve (38) Pilot oil manifold (39) Hydraulic tank (40) Hydraulic activation control valveSwing Control
Introduction
Swing motor (1) is driven by pressure oil from right pump (34). When the swing control lever is moved, swing parking brake (2) is released. The motor rotary group (7) of the swing motor (1) starts to rotate.The swing drive reduces the motor speed through two stages of gear reduction before rotating the upper structure.Swing Right Operation
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Swing motor (1) Swing motor (8) Line (9) LineWhen the control lever is moved to the SWING RIGHT position, pilot oil from pilot control valve (27) goes through pilot line (28) to swing control valve (22). The stem in swing control valve (22) is shifted by the pilot oil in order to connect passage (17) and passage (20) .Right pump oil is supplied to passage (17) through parallel feeder passage (11) and load check valve (18). The right pump oil then goes through swing control valve (22) to passage (20). From passage (20), the oil goes through line (8) to the motor rotary group (7) of swing motor (1). At this time, the swing parking brake is released.Return oil from the motor rotary group (7) of the swing motor (1) goes through line (9) to swing control valve (22). The return oil then goes through return passage (12) to return line (33). The motor rotary group (7) of the swing motor (1) rotates the upper structure for a RIGHT SWING operation.Swing Parking Brake Operation
ON Position
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Swing motor (control valve for swing parking brake) (1) Swing motor (6) Control valve for swing parking brake (29) Pilot line (32) LinePilot oil from pilot pump (36) enters pilot oil manifold (38) and flows through passage (31). Passage (31) separates the pilot oil flow into two paths. One path goes through hydraulic activation control valve (40) and line (32). The pilot oil then goes to the control valve for swing parking brake (6). The other path goes through line (30) and the pilot oil enters main control valves (10). The oil then goes through orifice (21) and into pilot passage (24) .Note: Part of the oil from orifice (21) goes to pilot passage (25). Pilot passage (25) is a branch