PUMP & MOTOR GP-SEC STEERING 2925072 - Caterpillar

Illustration 1 g06041493
Cooling system
(1) Water regulator
(2) Bypass
(3) Engine oil cooler
(4) Water pump
(5) Power train oil cooler
(6) Radiator
(A) Regulated coolant (red)
(B) Unrestricted coolant (pink)Water pump (4) draws coolant from the radiator (6) through power train oil cooler (5). Coolant is then pumped through engine oil cooler (3). Then, the coolant flows into the engine block. Coolant flows around the cylinder liners, through the water directors and into the cylinder head. The water directors send the flow of coolant around the valves and the passages for exhaust gases in the cylinder head. The coolant then goes to the front of the cylinder head and into water regulator housing (1). When the coolant is inside the housing, the water regulator controls the direction of coolant flow within the housing.When the coolant temperature is below 81 °C (178 °F), the water regulator will be closed. The path for the coolant return to radiator (6) is blocked. The coolant flows through the bypass (2) and back to the water pump (4).As the coolant temperature reaches 83° 1°C (181° 2°F), the water temperature regulator starts to open. Coolant begins to flow to radiator (6). When the coolant temperature reaches 92 °C (198 °F), the coolant is at normal operating temperature. The water temperature regulator is fully open and the flow of coolant to bypass (2) is blocked. The path for coolant to radiator (6) is open. The temperature of the returned coolant will be reduced as the coolant flows through radiator (6).Note: The water temperature regulator is an important part of the cooling system. The water temperature regulator divides the coolant flow between radiator (6) and bypass (2). Normal operating temperature is maintained. If the water temperature regulator is not installed in the system, the flow of coolant is not regulated. Most of the coolant will bypass the radiator (6). The engine, the transmission, and the hydraulic oil may overheat during high ambient temperatures.Radiator Assembly
Illustration 2 g06041521
Radiator (Rear View)
(1) Hydraulic oil cooler
(2) Radiator
(3) Air aftercoolerRadiator assembly is the source of coolant for the cooling system. Radiator (2) is made up of the following three sections: radiator top tank, radiator bottom tank, and radiator core assemblies. Also, radiator assembly includes air aftercooler (3) and the hydraulic oil cooler (1).Reference: For additional information about cooling the hydraulic system, refer to the Service Manual module Systems Operation, "Hydraulic Fan System" for the machine that is being serviced.The radiator top tank accepts the return coolant from the water regulator housing. The coolant flows from the radiator top tank down the tubes of the radiator core. Then, the coolant flows into the bottom tank. As the coolant flows through the radiator core and the air is pulled around the radiator core, the temperature of the coolant is reduced.Axle Oil Cooler
Illustration 3 g06041539
(1) Hydraulic line to hydraulic tank
(2) Rear axle heat exchanger
(3) Hydraulic line from hydraulic oil cooler
(4) Hydraulic lines to rear axle
(5) Divider valve
(6) Hydraulic lines to front axle
(7) Front axle heat exchangerThe axle oil cooler system consists of the