BRACKET AS 2772122 - Caterpillar

Illustration 1 g00279776
Location of torque converter relief valves (1) Torque converter inlet relief valve (2) Torque converter outlet relief valve
Illustration 2 g00279780
(1) Inlet relief valve (3) Passage to the hydraulic oil tank (4) Spool (5) Inlet passage (6) Shims
Illustration 3 g00279801
(2) Outlet relief valve (7) Shims (8) Inlet passage (9) Spool (10) Outlet passage to the torque converter screenTorque converter inlet relief valve (1) and torque converter outlet relief valve (2) are installed on the outside of the torque converter case. The operation of both valves is identical.Torque converter inlet relief valve (1) controls the maximum pressure of the oil that is flowing to the torque converter. The oil supply comes from the torque converter charging pump section. The oil comes through the torque converter hydraulic filter. The inlet relief valve ensures that the maximum oil pressure to the torque converter does not exceed approximately 930 35 kPa (135 5 psi).
With cold oil, inlet pressure going to the torque converter must not exceed 930 kPa (135 psi). Pressure that is greater than the maximum setting will damage the torque converter.
Torque converter outlet relief valve (2) controls the maximum pressure of the oil that is inside the torque converter. Oil comes from the torque converter through passage (8). The oil then flows past spool (9). The oil then exits through passage (10). The outlet oil goes through the torque converter and front brake cooling screen. This oil combines with oil from the parking and secondary brake valve. The oil then goes to the torque converter and front brake cooling diverter valve. The diverter valve sends the oil through the torque converter and front brake cooling oil cooler or around the oil cooler. The oil is then sent to the front brakes. From the front brakes, the oil returns to the hydraulic oil tank.The outlet relief valve ensures that the pressure of the oil that is inside the torque converter does not exceed 345 15 kPa (50 2 psi). Some of the oil from the outlet relief valve goes to the pump drive for lubrication.