HUB 4554193 - Caterpillar

Bucket Close
Illustration 1 g03372944
Hydraulic schematic for BUCKET CLOSE
(1) Main control valve
(2) Pilot line
(3) Implement pressure switch
(4) Bucket cylinder
(5) Line
(6) Line
(7) Bucket control valve
(8) Passage
(9) Passage
(10) Parallel feeder passage
(11) Passage
(12) Check valve
(13) Passage
(14) Return passage
(15) Pilot line
(16) Return line
(17) Pilot control valve
(18) Swing brake solenoid valve
(19) Drive pump
(20) Idler pump
(21) Pilot pump
Illustration 2 g03372967
Main control valve
(8) Bucket control valve The oil delivery from drive pump (19) flows through parallel feeder passage (10) to bucket control valve (7). The bucket control valve does not utilize the output flow from idler pump (20).When the joystick for the bucket is moved to the bucket CLOSE position, the pilot oil from pilot pump (21) flows through pilot control valve (17). The oil then flows through pilot line (2) to bucket control valve (7). Pilot oil shifts the spool of bucket control valve (7) downwards. When the bucket control valve is shifted downwards, the oil flow in parallel feeder passage (10) flows through passage (13), and into check valve (12). The oil then flows through check valve (12), through passage (11), and to bucket control valve (7). The oil flows through bucket control valve (7), through