KIT-RETAINER 3390443 - Caterpillar

Bucket Open
Illustration 1 g03245058
Hydraulic schematic for BUCKET OPEN (1) Bucket cylinder (2) Main control valve (3) Return passage (4) Parallel feeder passage (5) Line (6) Line relief valve (bucket cylinder head end) (7) Passage (8) Passage (9) Line relief valve (bucket cylinder rod end) (10) Line (11) Bucket control valve (12) Pilot line (13) Pilot line (14) Line (15) Pilot control valve (16) Line (17) Main pump (18) Pilot Manifold (19) Hydraulic tank (20) Passage (21) Passage (22) Return line (23) Hydraulic lockout switchDuring a BUCKET OPEN operation, the oil delivery from main pump (17) flows through line (16) to parallel feeder passage (4) in main control valve (2). Oil flows to bucket control valve (11) .Main pump (17) supplies oil to pilot manifold (18). Pilot manifold (18) supplies oil to pilot control valve (15) through line (14). When the joystick for the bucket is moved to the BUCKET OPEN position, the pilot oil flows from pilot control valve (15) through pilot line (13). The pilot oil flows to bucket control valve (11) .The pilot oil flow shifts bucket control valve (11) for BUCKET OPEN operation. The oil delivery from main pump (17) in parallel feeder passage (4) flows through passage (8) and through bucket control valve (11). The oil delivery from main pump (17) then flows through line (10) to the rod end of bucket cylinder (1) .Return oil from the head end of bucket cylinder (1) flows through line (5) to bucket control valve (11). Oil then flows through passage (7), return passage (3), return line (22) and back to hydraulic tank (19) .Bucket Close
During a BUCKET CLOSE operation, the oil delivery from main pump (17) flows through line (16) to parallel feeder passage (4) in main control valve (2). Oil flows to bucket control valve (11) .Main pump (17) supplies oil to pilot control valve (15) through line (14). When the joystick for the bucket is moved to the BUCKET CLOSE position, the pilot oil flows from pilot control valve (15) through pilot line (12) .The pilot oil flow shifts bucket control valve (11) for BUCKET CLOSE operation. The oil delivery from main pump (17) in parallel feeder passage (4) flows through passage (8) then through bucket control valve (11). Oil from main pump (17) then flows through line (5) to the head end of bucket cylinder (1) .Return oil from the rod end of bucket cylinder (1) flows through line (10) to bucket control valve (11). The oil then flows through passage (7), return passage (3), return line (22) and back to hydraulic tank (19) .