HINGE AS 1191968 - Caterpillar

Boom Raise
Illustration 1 g03349163
Hydraulic schematic for BOOM RAISE
(1) Boom cylinder
(2) Main control valve
(3) Return passage
(4) Parallel feeder passage
(5) Line
(6) Line relief valve (boom cylinder rod end)
(7) Passage
(8) Boom drift reduction valve
(9) Line relief valve (boom cylinder head end)
(10) Line
(11) Boom control valve
(12) Line
(13) Pilot line
(14) Pilot line
(15) Pilot control valve
(16) Line
(17) Main pump
(18) Pilot Manifold
(19) Hydraulic tank
(20) Line
(21) Passage
(22) Return passage
(23) Passage
(24) Hydraulic lockout switch A BOOM RAISE operation is accomplished when the oil delivery from main pump (17) is supplied to the head end of boom cylinder (1).During a BOOM RAISE 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 boom control valve (11).Main pump (17) supplies oil to pilot manifold (18). Pilot manifold (18) supplies oil to pilot control valve (15) through line (20). When the joystick for the boom is moved to the full BOOM RAISE position, the pilot oil flows from pilot control valve (15) through pilot line (13) Oil flows through pilot line (13) to boom control valve (11).The pilot oil flow shifts boom control valve (11) for boom RAISE operation. The oil delivery from main pump (17) in parallel feeder passage (4) flows