CLEVIS 9X0501 - Caterpillar

Illustration 1 g00990880
Pilot hydraulic system (1) Pilot Manifold (2) Pilot relief valve (low pressure circuit) (3) Pilot relief valve (high pressure circuit) (4) Pilot accumulator (5) Solenoid valve (dual pressure) (6) Solenoid valve (swing parking brake) (7) Solenoid valve (bucket bottom dump)(close) (8) Solenoid valve (bucket bottom bump open) (9) Solenoid valve (travel parking brake) (10) Swing parking brakes (11) Travel parking brakes (12) Machine control module (13) Vital Information Management System (VIMS) (14) Engine Control Module (ECM) (15) Swing dual pressure relief valve (16) Swing control valve (17) Front control valve (18) Pressure switch (implement)(normally open switch) (19) Solenoid valve (boom float)(front shovel) (20) Load sensing signal relief valve (21) Solenoid valve (warm-up) (22) Boom float relay (23) Proportional reducing valve (power shift pressure) (24) Solenoid valve (fan motor for engine cooling) (25) Solenoid valve (hydraulic cooling fan motor) (26) Pressure switch (swing)(normally closed switch) (27) Shuttle valve (28) Rear control valve (29) Swivel (30) Pilot oil flow to control valves (31) Pilot hydraulic oil filter (32) Hydraulic activation control selector valve (33) Left automatic track tensioning circuit (34) Pilot oil flow to the hydraulic activation control selector valve (35) Pressure switch (travel and bottom dump)(normally closed switch) (36) Right automatic track tensioning circuit (37) Motor (drive for the air conditioning compressor) (38) Relief valve (air conditioning circuit) (39) Gear pump (section for the air conditioning) (40) Gear pump (pilot)The pilot hydraulic system provides pilot oil to the pilot control system, the automatic track tensioning system and the power shift system.The pilot gear pump is a small gear type pump that is mounted on the output shaft of the radiator cooling piston pump. The radiator cooling piston pump is located on the top left corner of the pump drive.The output oil from the pilot gear pump passes through a pilot hydraulic oil filter. The pilot hydraulic oil filter is mounted near the pilot gear pump. From the pilot hydraulic oil filter, the pilot oil splits into three circuits.The first circuit is downstream from the pilot hydraulic oil filter. This circuit supplies oil to the proportional reducing valve. The proportional reducing valve controls power shift pressure to the implement piston pumps.The oil that is not used by the circuit for the hydraulic power control system flows into the pilot manifold. The two remaining circuits use oil from the pilot manifold. One circuit supplies pilot oil to the automatic track tensioning system in order to maintain the track tension. The second circuit supplies pilot oil to the pilot control system. The pilot oil in the pilot control system physically moves the spools in the main control valves in order to initiate the desired function.