FRAME AS 3117739 - Caterpillar

Components
Illustration 1 g01112126
(1) Hydraulic Oil Cooler (2) Vertical Tube (3) Thermal Bypass Valve (4) Outlet (5) Inlet (6) Horizontal TubeHydraulic oil cooler (1) is located behind the engine radiator, as shown. Thermal bypass valve (3) is located in the hydraulic oil cooler.The demand fan pulls cool air through the hydraulic oil cooler. This cools the hydraulic oil.Oil Flow
Illustration 2 g01112130
(1) Hydraulic Oil Cooler (3) Thermal Bypass Valve (7) Line to the Hydraulic Oil Tank (8) Line to the Implement Pump (9) Cold Oil Relief Valve (10) Line to the Charge Pump (11) Line to the Fan Drive Pump (12) Line From the Fan Drive Pump (13) Line From the Dual Tilt Valve (14) Fan Drive Motor (15) Suction ManifoldOil from fan drive motor (14) and a small amount of oil from the pilot drain of the dual tilt valve (13) (if equipped) flows to inlet (5) on hydraulic oil cooler (1). Oil flows through horizontal tube (6) toward outlet (4) .When the oil is cold, thermal bypass valve (3) remains open. This allows oil to bypass hydraulic oil cooler (1). The oil will then flow to suction manifold (15) .When the oil is warm, thermal bypass valve (3) closes. This forces oil to flow through hydraulic oil cooler (1). The oil returns through vertical tube (2) and flows through outlet (4) to suction manifold (15). This oil supplements oil from the hydraulic oil tank in order to supply the following:
Steering Charge Pump
Fan Drive Pump
Implement PumpOpening temperature for the thermal bypass valve is 62 to 65 °C (144 to 149 °F). When the thermal bypass valve is closed, the valve will open momentarily in the event of pressure spikes in the system. The opening pressure for the valve is 620 kPa (90 psi) at a temperature of 71 °C (160 °F).