CAB AR 5010500 - Caterpillar

Illustration 1 g06232622
Hydraulic schematic for transmission oil cooling system
(1) Transmission oil filter
(2) Transmission hydraulic control
(3) Torque converter inlet relief valve
(4) Transmission hydraulic control relief valve
(5) Transmission charge pump
(6) Torque converter scavenge pump
(7) Torque converter outlet relief valve
(8) Torque converter housing
(9) Thermal bypass valve
(10) Transmission oil cooler
(11) Sump
(12) ScreenTransmission Oil Cooler Operation
The main components of the transmission oil cooler system are the transmission, transmission charge pump (5), torque converter scavenge pump (6), transmission oil filter (1), transmission hydraulic control (2), torque converter (8),thermal bypass valve (9) transmission oil cooler (10) and Transmission ECM.Transmission charge pump (5) draws oil from transmission oil system. The oil is then to transmission oil filter (1). The flow oil is then split, some oil flows to torque converter (8) and remainder oil is sent to transmission hydraulic control (2). Oil from torque converter (8) is sent to the transmission oil cooler. The Power Train ECM reads signals from the transmission oil temperature sensor and the torque converter temperature sensor to determine oil temperature. The Power Train ECM uses the signals from both temperature sensors to determine when to energize the demand fan supply solenoid. If the temperature of the oil is low, the Power Train ECM will energize the demand fan supply solenoid. The demand fan supply solenoid valve controls the speed of the hydraulic fan motor by changing the flow of oil to the motor. A fan speed sensor allows the Power Train ECM to monitor the speed of the hydraulic fan motor When the engine is started, the hydraulic fan motor will operate at a reduced speed. The hydraulic fan motor will increase speed as the temperature of the transmission oil increases. Thermal bypass valve (9) will bypass the transmission oil to transmission oil cooler (10) when the transmission oil is below normal operating temperature. When the oil is above normal operating temperature, thermal bypass valve (8) closes, and transmission oil will sent to transmission oil cooler (10).Location of Components (Transmission Oil Cooler)
Illustration 2 g06232626
Location of transmission oil cooler system components
(1) Transmission oil filter
(2) Transmission hydraulic control
(3) Torque converter inlet relief valve
(4) Transmission hydraulic control relief valve
(5) Transmission charge pump
(6) Torque converter scavenge pump
(7) Torque converter outlet relief valve
(8) Torque converter housing
(9) Thermal bypass valve
(10) Transmission oil cooler
(11) Sump
(12) ScreenTransmission charge pump (5) draws oil from sump (11) through screen (12). The oil flows from transmission charge pump (5) to transmission filter (1). The flow of oil is then split to torque converter (8), and transmission hydraulic control (2). Oil leaves torque converter (8) and flows to transmission oil cooler (10) to cool the oil.Heat is transferred from oil to air by the use of a heat exchanger, transmission oil cooler (10). The oil flow to transmission oil cooler (10) is regulated by thermal bypass valve (9). As the warm oil flows through the tubes, air flows over the tubes and cools the oil in the tubes. After the transmission oil passes through the cooler, the oil flows to the transmission to cool and