IMPELLER 3132760 - Caterpillar

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(6) Wheel traction control motor (7) Rear axle (8) Final driveTraction control motors (6) are connected to rear axles (7) . Rear axles (7) are connected to final drives (8) .Drive Train Cooling System and Final Drive Lubrication
Drive Train Cooling System
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(1) Drive cooling fan (2) Motor for drive cooling fan (3) Inverter cabinet (4) Generator (5) Wheel traction motors (6) Tube (7) DuctworkDrive cooling fan (1) cools the electrical drive train components. Drive train fan motor (2) drives cooling fan (1) . Cooling fan (1) circulates air flow through drive train ductwork (7) which routes the air to the electrical drive train components.Cooling fan (1) pulls air through inverter cabinet (3) which cools inverter cabinet (3) and sends the air flow through ductwork (7) . The air through ductwork (7) cools generator (4) and wheel traction motors (5) . The air then exists the truck at the rear of the rear axle.Tube (6) provides pressurized air for inverter cabinet (3) to keep dirt and debris out of the cabinet.
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(1) Drive cooling fan (2) Motor for drive cooling fan (8) Steering pump (9) Solenoid valve and manifoldDrive cooling fan motor (2) is powered by steering oil.Oil from steering pump (8) is sent to solenoid valve and manifold (9) . Solenoid valve and manifold (9) directs oil to drive cooling fan motor (2) . Motor (2) then powers drive cooling fan (1) .Final Drive Lubrication
The final drive lubrication system provides oil to the final drives for lubrication and cooling.
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(1) Solenoid valve and manifold (2) Final drive lubrication pump and motorWhen the steering accumulators are charged, solenoid valve and manifold (1) sends hydraulic oil from the steering pump to final drive lubrication pump and motor (2) .Note: For more information about the steering system, refer to Service Manual, KENR8598, "Hydraulic Fan and Steering System".
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Typical view of a schematic of the final drive lubrication (1) Solenoid valve and manifold (2) Final drive lubrication pump and motor (3) Oil filter (final drive lubrication) (4) Pressure sensor (5) Bypass switch (6) Final drive (7) Temperature sensor (8) Oil cooler (optional)
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View of the front of the rear axle housing (2) Final drive lubrication pump and motor (3) Oil filter (final drive lubrication) (4) Pressure sensor (5) Bypass switch (7) Temperature sensorFinal drive lubrication pump and motor (2) powers two gear pumps for lubrication of the two final drives. The two section pump draws oil from both final drives and circulates oil through filters (3) .Final Drive Lubrication Strategy
The final drive lubrication strategy limits truck speed until the final drive oil temperature reaches a certain threshold. The lubrication strategy also extends the final drive pump life by controlling pump oil flow when the final drive lubrication oil is cold.The speed limiting strategy limits truck speed until the temperature of the final drive oil is warm enough to allow proper lubrication of the bearings in the final drive. Limiting the truck speed reduces component wear due to lack of lubrication because