SENSOR AS-POSITION 3156699 - Caterpillar

Illustration 1 g01540633
Control valve compartment (1) Line to the oil cooler inlet (2) Slow return check valve (3) Bypass check valve (4) Line from the oil cooler outlet (5) Return line to the hydraulic tank (6) Check valveSlow return check valve (2) is contained in check valve (6). Slow return check valve (2) is located between the main control valve and the hydraulic tank in the return circuit. The slow return check valve restricts the return oil flow. This restriction causes a pressure increase in the return line and the makeup line.If cavitation occurs in the swing motor, oil from return line flows into the makeup line. This makeup oil is supplied to the inlet port of the swing motor in order to prevent cavitation in the swing motor.Note: For more information on the makeup operation, refer to System Operation, "Oil Makeup (Swing System)".The return oil flow through slow return check valve (2) is divided into two flow paths. A portion of the oil flows through inlet line (1) to the hydraulic oil cooler. The cooled oil from the hydraulic oil cooler flows through outlet line (4) and through return line (5) to the return filter in the hydraulic tank. The remainder of the oil flow from slow return check valve (2) flows through bypass check valve (3) to the return filter in the hydraulic tank. Bypass check valve (3) is contained in check valve (6).