CYLINDER GP-BULLDOZER LIFT 2702735 - Caterpillar

Illustration 1 g00637691
Hydraulic schematic for BOOM RAISE (1) Boom cylinder (2) Line(oil flow to boom cylinder head end) (3) Line (oil flow to boom cylinder rod end) (4) Line (pilot oil flow) (5) Line (return pilot oil) (6) Proportional valve for boom cylinder rod end (7) Main control valve (8) Flow compensator valve (9) Boom control valve (10) Passage (pump delivery flow) (11) Passage (pump delivery flow) (12) Load check valve (13) Passage (oil flow to boom drift reduction valve) (14) Boom drift reduction valve (15) Valve (16) Return passage (17) Line (return oil) (18) Pilot manifold (19) Line (pilot oil supply) (20) Pilot pump (21) Front pump (22) Rear pump (23) Solenoid valve for boom drift reduction valve (28) Proportional valve for boom cylinder head endBoom Raise
Illustration 2 g00576333
Main control valve (rear view) (9) Boom control valveDuring a boom operation, boom control valve (9) is activated. The oil delivery from front pump (21) and rear pump (22) are combined in main control valve (7). Pilot pump (20) sends pilot system oil through line (19) to pilot manifold (18). The pilot system oil then flows through line (4) to the proportional valve for boom cylinder head end (28) and the proportional valve for boom cylinder rod end (6) .When the boom control lever is operated, an electrical signal from the control lever is sent to the