LINES GP-WATER 2723257 - Caterpillar

Illustration 1 g00630262
Return Hydraulic SystemThe hydraulic oil is cooled and returned to the hydraulic tank by the return system. The circuit contains the two cooler bypass relief valves, the case drain oil manifolds, the two hydraulic coolers and the hydraulic tank.The cooler bypass relief valves maintain back pressure in the implement return system. The travel back pressure relief valves maintain back pressure in the travel return system. The swing back pressure relief valve maintain back pressure in the swing return system. The back pressure prevents cavitation in the front control valve, the rear control valve and the swing control valve.The hydraulic cooler shutoff valve prevents return oil from going through the hydraulic cooler when the hydraulic oil is below 38 °C (100 °F). The hydraulic cooler shutoff valve consists of a solenoid valve and a check valve. The solenoid valve is controlled by the machine control module.