SENSOR GP-SPEED 2666661 - Caterpillar

Illustration 1 g00660560
Hydraulic schematic (1) Left travel motor (2) Right travel motor (3) Swing motor (4) Bucket cylinder (5) Boom cylinder (6) Stick cylinder (7) Blade cylinders (8) Swing cylinder (9) Swivel (10) Main control valves (11) Main control valves for swing boom and blade (12) Hydraulic activation control valve (13) Boom drift reduction valve (14) Main relief valve (15) Diverter valve for boom and blade (17) Pilot control valve for swing boom (18) Travel pilot control valves (19) Pilot control valves for swing and stick (20) Pilot control valves for bucket, boom and blade (21) Pilot oil manifold (22) Accumulator (23) Pilot relief valve (24) Solenoid valve for power mode (25) Travel speed solenoid valve (26) Slow return check valve (27) Bypass check valve (28) Filter (29) Hydraulic tank (30) Right pump (31) Left pump (32) Pump for swing boom and blade (33) Pilot pump (34) Spool valve for no-load conditions (35) Reducing valve (36) Pilot filterPump Pressure
Introduction
Illustration 2 g00637209
Pump compartment (32) Pump for swing boom and blade (33) Pilot pump (37) Main pumpThis machine is driven and controlled by the following three systems.
The main hydraulic system supplies oil to the cylinders and motors of the machine. The hydraulic system of the swing boom and blade supplies oil to the circuitof the boom. The hydraulic system of the swing boom and blade supplies oil to the blade circuits.
The pilot hydraulic system supplies oil to the control circuits.The main hydraulic system oil is supplied by main pump (37). Main pump (37) is a single piston type pump and the main pump is a variable displacement piston pump. The single main pump functions in the same manner as a double pump by separating the pump oil flows into the right and left circuits. Separation of pump flow into the two circuits is done by the activation of the pistons in the cylinder block.Note: Throughout this manual, the portion of the pump that supplies oil flow to the right circuits will be described as the right pump. The portion of the pump that supplies oil flow to the left circuits will be described as the left pump.Right pump (30) supplies oil flow to the right control system of the main control valves (10). Left pump (31) supplies oil flow to the left control system of the main control valves (10). The main pump is mechanically connected to the engine through the flexible coupling.The pump for the swing boom and blade (32) is a gear pump. The pump supplies oil to the hydraulic system for the swing boom and the blade. Pilot pump (33) is a gear type pump and the pilot pump is directly connected to rear of the swing boom/blade pump (32). The pilot pump drives the pilot hydraulic system. All engine output is used to drive these three pumps.When the load increases, the main pump increases the delivery pressure and the main pump decreases the flow rate. The system maintains constant hydraulic horsepower. The engine is maintained at the full