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| Illustration 1 | g06144712 |
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View of the gear motor on the radiator group (1) Gear Motor (2) Inlet (3) Outlet (4) Case Drain (5) Anti-Cavitation Valve | |
The radiator group demand fan is hydraulically driven by gear motor (1). Gear motor (1) is attached to the fan on the back of the radiator group and is driven by the brake, fan, and hoist piston pump.
When the machine is started, oil flows into gear motor (1) through inlet (2). The hydraulic oil flows into a cavity that is formed by gears. The pressure of the hydraulic oil forces the gears and the output shaft to rotate.
The fan is attached to the output shaft by an adapter. The rotation of the output shaft causes the fan to rotate. As the gears rotate, the hydraulic oil passes through outlet (3) and the oil flows out of the motor.
The demand fan speed solenoid valve is on the machine combination valve and is controlled by the transmission ECM. The transmission ECM sends a signal to the demand fan solenoid valve to control the speed of the fan. When the machine ECM sends a maximum signal to the demand fan solenoid valve, the flow control valve will open and the fan will be at the minimum speed. When the machine ECM sends a minimum signal to the demand fan solenoid valve, the flow control valve will close and the fan will be at the maximum because the flow control valve is no longer diverting oil flow around the motor.
The machine ECM will send the required signal to the demand fan solenoid valve to provide the proper fan speed for the cooling system. The machine ECM will monitor the following parameters to provide the proper fan speed:
- Hydraulic oil temperature
- Transmission oil temperature
- Brake Temperature
Case drain (4) drains oil from the motor to the tank.
Anti-Cavitation Valve (5), located inside gear motor (1) prevents fan motor cavitation when the engine stops and momentum causes the fan motor to continue rotating.
Air to Air After Cooler (ATAAC) Group
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| Illustration 2 | g06144984 |
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View of the gear motor on the ATAAC group (6) Gear Motor (7) Inlet (8) Outlet (9) Case Drain (10) Anti-Cavitation Valve | |
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| Illustration 3 | g06144990 |
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View of the ATAAC Solenoid Valve (11) ATAAC Fan Speed Solenoid Valve | |
The ATAAC group demand fan is hydraulically driven by gear motor (6). Gear motor (6) is attached to the fan on the back of the ATAAC group and is driven by a fixed displacement gear pump on the left side of the engine.
When the machine is started, oil flows into gear motor (6) through inlet (7). The hydraulic oil flows into a cavity that is formed by gears. The pressure of the hydraulic oil forces the gears and the output shaft to rotate.
The fan is attached to the output shaft by an adapter. The rotation of the output shaft causes the fan to rotate. As the gears rotate, the hydraulic oil passes through outlet (8) and the oil flows out of the motor.
When temperatures are high, the Engine ECM sends no current to ATAAC fan speed solenoid valve (11), resulting in maximum fan speed. If the fan needs to turn slower due to lower temperatures, the engine ECM will energize the proportional ATAAC fan speed solenoid.
The Engine ECM will send the required signal to the ATAAC fan speed solenoid valve to maintain the appropriate operating temperature. The ECM will monitor the following parameters to provide the correct fan speed:
- Fuel Temperature Sensor
- Engine Intake Temperature Sensor
Case drain (9) drains oil from the motor to the tank.
Anti-Cavitation Valve (10), located inside gear motor (6) prevents fan motor cavitation when the engine stops and momentum causes the fan motor to continue rotating.