HARNESS AS-ENGINE 3878296 - Caterpillar

Illustration 1 g00991052
Pilot Manifold (1) Pilot manifold (2) Line to the automatic track tensioning system (3) Line to the pilot accumulator (4) Solenoid valve (dual pressure) (5) Line to the load sensing signal relief valve (6) Solenoid valve (swing parking brakes) (7) Line to the swing parking brakes (8) Solenoid valve (bottom dump open) (9) Line to the bottom dump control spool for bottom dump open (10) Solenoid valve (bottom dump close) (11) Line to the bottom dump control spool for bottom dump close (12) Solenoid valve (travel parking brake) (13) Line to the travel parking brakes (14) Test port (pilot system high pressure circuit) (15) Line from the pilot hydraulic oil filter (16) Test port (pilot system low pressure circuit) (17) Line from the hydraulic activation control selector valve (18) Line to the tank return (19) Line from the pressure reducing valve to the passage in the pilot manifold for return to tank (20) Check valve (21) Pilot relief valve (high pressure circuit) (22) Line to hydraulic tank (23) Line from pilot manifold to pressure reducing valve (24) Line from the hydraulic activation control selector valve (25) Pressure reducing valve (low pressure circuit) (26) Line to the hydraulic activation control selector valveThe pilot manifold is located in the upper left side of the cab support. In the pilot manifold, the pilot system oil is divided into the pilot system high pressure circuit and the pilot system low pressure circuit.Pilot system oil in the pilot system high pressure circuit supplies the automatic track tensioning circuit and the proportional reducing solenoid valve. This pilot system oil is regulated to a pressure of 7000 kPa (1015 psi).Pilot system oil in the pilot system low pressure circuit supplies the pilot control circuit. This pilot system oil is regulated to a pressure of 4500 kPa (650 psi).