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| Illustration 1 | g02327436 |
Hydraulic Fan System (1) Hydraulic oil tank (2) Engine ECM (3) Fan reversing valve (if equipped) (4) Fan drive motor (5) Motor bypass valve (6) Hydraulic oil cooler (7) Oil cooler bypass valve (8) Counterweight control valve (9) Fan/counterweight drive pump (10) Hook winch pump (11) Boom winch pump | |
Fan Drive Motor
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| Illustration 2 | g02327695 |
(3) Fan reversing valve (4) Fan drive motor (5) Motor bypass valve | |
Fan drive motor (4) is located at the front of the machine in front of the radiator and in the middle of the radiator guard.
Fan drive motor (4) is a fixed displacement bent axis motor. This hydraulic motor turns the fan that pulls air through the radiator. An optional bidirectional fan motor is available. The optional bidirectional fan motor requires a reversing valve.
If the machine is equipped with the optional reversing fan, fan reversing valve (3) is installed. Fan reversing valve (3) controls the direction of the flow of oil to the fan drive motor. The direction of the flow of oil determines the direction of rotation of the fan.
Fan reversing valve (3) is located inside the front radiator guard, as shown.
Fan Motor Bypass Valve
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| Illustration 3 | g02327759 |
(5) Motor bypass valve (5a) Remote fan pressure port (5b) Fan Bypass Pressure Sensor | |
Remote fan pressure port (5a) and fan motor bypass valve (5) are located under the radiator. Remote fan pressure port (5a) and Fan motor bypass valve (5) can be accessed by removing the plate that is just below the radiator.
Remote fan pressure port (5a) measures the pressure of oil that is supplied to the fan motor. Fan motor bypass valve (5) controls fan speed. Fan motor bypass valve (5) allows oil to bypass the fan in order to decrease fan speed when less cooling is required.
Engine ECM (2) receives information about the bypass pressure for the fan system from fan bypass pressure sensor (5b). This information is used as feedback information in order to improve the precision and stability of the fan control. The bypass pressure for the fan system is controlled by engine ECM (2) in order to control the fan motor speed.
Hydraulic Oil Cooler and Bypass Valve
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| Illustration 4 | g02327839 |
(6) Hydraulic oil cooler (7) Bypass valve | |
Hydraulic oil cooler (6) is located in front of the engine and behind the radiator on the right side of the radiator guard. The hydraulic oil cooler cools the oil that comes from the outlet of the fan motor.
Bypass valve (7) is located on the right frame rail behind hydraulic oil cooler (6). Bypass valve (7) allows the oil to bypass the cooler when the oil is cold.
Fan Drive Pump
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| Illustration 5 | g02327558 |
(9) Fan/counterweight drive pump (10) Hook winch pump (11) Boom winch pump | |
Boom winch pump (11) is mounted on the upper left of the engine flywheel housing. Hook winch pump (10) is located on the rear of boom winch pump (11). Fan/counterweight drive pump (9) is mounted to the rear of hook winch pump (10) .
Fan/counterweight drive pump (9) is a fixed displacement gear pump. The pump provides the oil flow that is needed to operate the hydraulic fan motor. Fan/counterweight drive pump (9) also provides the flow that is needed to move the counterweight. When the counterweight control lever is activated, flow is diverted from the fan hydraulic system to the counterweight cylinders. Normal operation of the fan hydraulic system resumes when the counterweight control lever is released.