CONTROL & MTG GP-PEDAL 1725262 - Caterpillar

Illustration 1 g02712857
Cooling system
(1) Water regulator. (2) Aftercooler. (3) Radiator. (4) Cooler for power train (Torque converter and transmission). (5) Water pump. (6) Engine oil cooler. (7) Bypass. (AA) Regulated coolant. (BB) Unrestricted coolant.
Water pump (5) draws coolant from the cooler for power train (4). Coolant flows from pump (5) into the engine block. Coolant flows over engine oil cooler (6). 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, water regulator (1) controls the direction of coolant flow within the housing.When the coolant temperature is below 78 °C (172 °F), water regulator (1) will be closed. The path for the coolant return to radiator (3) is blocked. The coolant flows through bypass (7) and back to water pump (5).As the coolant temperature reaches 80° 2°C (176° 4°F), water temperature regulator (1) starts to open. Coolant begins to flow to radiator (3). When the coolant temperature reaches 94 °C (201 °F), the coolant is at normal operating temperature. Water temperature regulator (1) is fully open and the flow of coolant to bypass (7) is blocked. The path for coolant to radiator (3) is open. The temperature of the returned coolant will be reduced as the coolant flows through radiator (3).Note: Water temperature regulator (1) is an important part of the cooling system. Water temperature regulator (1) divides the coolant flow between radiator (3) and bypass (7). 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 radiator (3). The engine, the transmission, and the hydraulic oil may overheat during high ambient temperatures.Reference: For more information on the coolant flow, refer to Systems Operation, KENR9241, "C7.1 Engines for Caterpillar Built Machines", "Cooling System".Axle Oil Cooler
Illustration 2 g06155079
(1) Water lines from radiator
(2) Hydraulic return line
(3) Front axle oil cooler line set
(4) Solenoid valve
(5) Front axle temperature sensor
(6) Axle oil cooler pump
(7) Axle oil cooler
(8) Rear axle oil cooler line set
(9) Rear axle temperature sensorThe axle oil cooler is a water over oil heat exchanger system. Rear axle oil temperature sensor (9) and front axle oil temperature sensor (5) send signals to the transmission ECM. When the signal is at or above the trigger point for axle cooling to be activated, the ECM sends a signal to solenoid valve (4). Solenoid valve (4) opens and allows oil from the implement system to flow to the motor portion of axle oil cooling pump (6). Axle oil cooler pump (6) pumps axle oil from the axles through front cooler line set (3) and rear cooling line set (8). Axle oil flows to axle oil cooler (7). Water from the engine cooling system flows