ROTATING GP-PUMP 3738451 - Caterpillar

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Location of the Axle Oil Cooler Pump and Clutch (1) Axle Oil Cooler Pump and Clutch.Axle oil cooler pump and clutch (1) is mounted on a bracket at the front of the engine beneath the damper. The axle oil cooler pump and clutch is powered by the engine crankshaft via a V-belt that is driven by the damper pulley. The axle oil cooler pump is a two-section gear pump. The pump that circulates the oil for the front axle housing is mounted closest to the damper. The tandem mounted pump circulates the oil for the rear axle housing.
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Front View of the Rear Axle (2) Rear axle center housing. (3) Axle oil cooler temperature switch.Axle oil cooler pump and clutch (1) is activated when the contacts of axle oil cooler temperature switch (3) close. The axle oil cooler temperature switch contacts close when the axle oil reaches the actuation temperature of the switch. The actuation temperature of axle oil cooler temperature switch (3) is 65° 3°C (150° 37°F). When the contacts of axle oil cooler temperature switch (3) close, the electric clutch on the axle oil cooler pump and clutch is energized. The axle oil cooler temperature switch is installed in a manifold block at the center of the rear axle housing.
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Location of the Axle Oil Cooler (4) Axle oil cooler.
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Axle Oil Cooler Hose Assemblies (5) Coolant hose assemblies.When the electric clutch is energized the pumps circulate the axle oil through separate systems for each axle housing. The oil is pumped through passages in both the front axle housing and the rear axle housing. Each gear pump causes the oil to flow through hoses to axle oil cooler (4). The axle oil cooler is installed between the frame rails of the machine in front of the rear axle. While the axle oil flows through the axle oil cooler, engine coolant also flows through the axle oil cooler. The axle oil cooler performs two functions. The engine coolant cools the axle oil that flows through the axle oil cooler if the axle oil temperature is higher than the normal operating temperature. The axle oil cools the engine coolant that flows through the axle oil cooler if the engine coolant temperature is higher than the normal operating temperature. The engine coolant flows through coolant hose assemblies (5) to the axle oil cooler and flows back to the engine through coolant hose assemblies (5). The flow of the axle oil through the axle oil cooler helps keep the axle housings and internal brake components cool.
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Axle Oil Cooler (6) Axle oil cooler bypass check valves.Two axle oil cooler bypass check valves (6) are located at the axle oil cooler. The bypass check valves limit the oil pressure in the oil cooler core. The bypass check valves are rated at 448 55 kPa (65 8 psi). If the bypass check valves open, the axle oil bypasses the axle oil cooler.