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NUT 7B0170 - Caterpillar

7B0170 NUT Caterpillar parts NUT
Alternative (cross code) number:
Caterpillar 7B0170 NUT

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The "Engine Cooling Hydraulic Radiator Fan" is controlled by the ECM. The ECM controls the operation of the hydraulic fan by sending a proportional current output to the "Engine Cooling Fan Solenoid" (2). The solenoid is mounted on the "Fan Drive Pump" (1). When the solenoid is energized, hydraulic oil flow is sent from the "Fan Drive Pump" to the *Fan Drive Motor (3). The "Fan Drive Motor" drives the radiator fan at a speed that depends on the amount of output current delivered to the proportional solenoid. To determine the correct fan speed that is required, the ECM will analyze the following inputs:
The temperature of the engine coolant (jacket water).
The temperature of the aftercooler coolant.
The temperature of the transmission oil.
The temperature of the oil in the outlet of the torque converter.
The temperature of the brake oil.
The brake pressure (braking applied).
The speed of the engine.
The actual gear.The ECM determines the correct fan speed requirement according to the listed machine status information. The "Engine Cooling Fan Speed Sensor" (4) provides a frequency input to the ECM that indicates the actual speed of the radiator fan. The ECM uses this information to compare the actual fan speed to the required fan speed. The ECM will adjust the output current to the solenoid to maintain the required speed of the fan.Brake Cooling System
Illustration 3 g01206811
(5) Brake Cooling Oil Motor
(6) Brake Cooling Oil Motor Solenoid
(7) Hoist Hydraulic TankThe cooling system for the front brake and the rear brakes is controlled by the Brake ECM. The ECM determines the volume of oil flow that the "Brake Cooling Motor" (5) supplies to a two-section "Brake Cooling Pump". The "Brake Cooling Motor" is located inside the "Hoist Hydraulic Tank" (7). The cooling motors direct the oil to oil coolers and then on to the front and rear brakes for cooling. The ECM controls the proportional "Brake Cooling Pump Solenoid" (6) to adjust the flow of oil supplied to the brake cooling motor.To determine the amount of output current to send to the proportional brake cooling pump solenoid, the ECM analyzes the following system input status: The ECM will send the correct output current to the solenoid to provide adequate oil flow to the cooling motors for brake cooling. A zero current signal will cause the brake cooling pump

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