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FASTENER GP 4646570 - Caterpillar



4646570 FASTENER GP Caterpillar parts FASTENER
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71
Alternative (cross code) number:
CA4646570
464-6570
4646570
Caterpillar 4646570 FASTENER GP

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Illustration 1 g01550434
(A) Standard fan (B) Optional reversing fan (1) Fixed displacement gear pump (2) Oil cooler outlet (3) Hystat charge (4) Flow control valve (5) Makeup valve (6) Fan drive gear motor (7) Relief valve (8) Fan reversing valve (9) Flow control valve (10) Makeup valve (11) Flow control valveThe hydraulic fan system contains fixed displacement gear pump (1) and fixed displacement fan drive gear motor (6). The hydraulic fan system also includes either the standard fan (A) or reversing fan (B) .Standard Fan
Illustration 2 g01551793
(A) Standard fan (4) Flow control valve (5) Makeup valve (6) Fan drive gear motorWhen the engine is started, hydraulic oil is drawn from the tank by fixed displacement gear pump (1). Flow control valve (4) is controlled by the machine ECM. The speed of the fan motor depends on the amount of flow that is allowed through flow control valve (4). The control of the fan speed is based on the value of the following conditions:
Air inlet temperature
Hydraulic oil temperature
Engine coolant temperature
Illustration 3 g01550516
Standard demand fan (12) Hydraulic oil temperature sensor (13) Machine ECM (14) Demand fan solenoid (15) Engine ECM (16) Air inlet temperature sensor (17) Engine coolant temperature sensorMachine ECM (13) controls the command to demand fan solenoid (14). The machine ECM uses input from the three temperature sensors in order to determine the command. Air inlet temperature (16) and engine coolant temperature (17) are communicated to machine ECM (13) from engine ECM (15). Information from the hydraulic oil temperature sensor (12) is sent directly to the machine ECM. Flow control valve (4) closes in order to restrict the flow of oil through the flow control valve. When the flow of oil through the flow control valve is restricted, oil must flow through fan drive gear motor (6). This will cause the fan motor to turn faster. The speed of the fan depends on the amount of current that is sent to the demand fan solenoid valve.When the machine requires less air flow, the machine ECM will increase the amount of electric current to demand fan solenoid (14) in order to shift the flow control valve more open. When the flow of oil through the control valve is increased, the flow of oil from the hydraulic fan pump will flow through the flow control valve instead of flowing to the fan motor. This will cause the fan motor to turn more slowly. The speed of the fan depends on the amount of current that is sent to the demand fan solenoid valve.Makeup valve (5) prevents cavitation of the fan motor during deceleration.Reversing Fan (If Equipped)
The optional reversing hydraulic fan system has a reversing solenoid (20) which is controlled by engine ECM (15). When the top of reversing fan switch (18) is depressed, the Engine ECM closes reversing fan relay (19) in order to energize the solenoid. When the bottom of the reversing fan switch is depressed, the fan reversing solenoid is energized in order to reverse the fan for 10 seconds. This


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