GENERAL AR 2733503 - Caterpillar

One-Way Hydraulic System
Illustration 1 g01509007
Simplified Hydraulic Schematic (A) TWO-WAY position (B) ONE-WAY position (1) Ball valve (2) Ball valve (3) Line (pilot oil flow) (4) Line (one-way return) (5) Line (6) Line (7) Line (8) Main control valve (9) Proportional reducing valve (10) Relief valve (one-way system) (11) Passage (pump delivery flow) (12) Flow compensator valve (13) Load check valve (14) Auxiliary control valve (15) Passage (pump delivery flow) (16) Line relief valve (17) Passage (18) Passage (20) Proportional reducing valve (22) Pilot manifold (23) Hydraulic tank (24) Front pump (25) Rear pump (26) Pilot pump (27) Line (pilot oil supply)
Illustration 2 g00782484
Ball valves are shown in ONE-WAY position. (1) Ball valve (2) Ball valve (10) Relief valve (one-way system)Pilot pump (26) sends pilot system oil through line (27) to pilot manifold (22). The pilot system oil then flows through line (3) to proportional reducing valve (9) and proportional reducing valve (20) .When the work tool control is operated, an electrical signal from the control is sent to the machine electronic control module. The machine electronic control module energizes proportional reducing valve