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Rotating fan blades can result in personal injury or death. Stop the engine and allow the fan to come to a complete stop before making any test or adjustment. Before starting the engine, make sure all of the finger guards are installed and the guard door is closed. Do not allow any tools or test equipment to protrude or vibrate into the path of the rotating fan blades. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
- Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower the work tools to the ground.
- Allow only one operator on the machine. Keep all personnel away from the machine or in the view of the operator.
- Engage the parking brake.
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Illustration 1 g00893065 - Place the steering frame lock in the LOCKED position.
Reference: For information about preparing a machine for troubleshooting, refer to the Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
Hydraulic Fan Speed (Testing and Adjusting)
- Place the transmission in the NEUTRAL position. Engage the parking brake. Connect Caterpillar Electronic Technician (ET) to the diagnostic connector. The diagnostic connector is located to the left and behind the operator seat.
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Illustration 2 g02427958 - Start ET. When ET initializes, select the engine ECM from the choices that are available. Refer to Illustration 2.
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Illustration 3 g02428248 Show/hide table
Illustration 4 g02428436 - Check all fault codes under the engine ECM. Ensure that no faults are present in the fan drive system. Ensure that no faults are present with the hydraulic oil temperature sensor, engine coolant temperature sensor and inlet manifold temperature sensor. If no faults are present, ensure that economy mode is “disabled” in the transmission or Power Train ECM configuration. Begin the calibration. Select "Service > Calibrations > Engine Cooling Fan Calibration". Refer to Illustration 3 and Illustration 4.
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Illustration 5 g02428259 - The screen that is shown in Illustration 5 will appear. Follow the instructions on the screen. Click on "OK".
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Illustration 6 g02428276 - The "Calibrations" screen will appear. Select both check boxes. Click on "Begin".
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Illustration 7 g02428376 - Ensure that the parking brake is set. Run the engine at high idle. Click on "Next" in the lower left corner of the screen.
- Continue running the machine at high idle. Use the photo tach to measure the fan speed. Adjust the current for the fan solenoid by using the arrows at the bottom of the screen. Increasing the current will decrease the fan speed. Decreasing the current will increase the fan speed. Adjust the current until the fan speed is 500 ± 50 rpm.
Note: If the machine is equipped with the variable pitch fan, set the fan speed to the values shown in Table 1 below.
Show/hide tableTable 1 Serial Number Range Fan Speed Target P6C1-900 1470 ± 50 RPM EDW1-700 EDW701-1200 1220 ± 30 RPM P6C901-1400 B8P203-300 M5S102-200 B8P301-Up 1300 ± 30 RPM P6C1401-Up M5S201-Up EDW1201-Up Note: The procedure on the screen may specify a different value for the fan speed. Do not use this value. Set the fan speed according to the above instructions.
When the fan speed has been set properly, click the "Next" button in the lower left corner of the screen.
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Illustration 8 g02428416 - After setting the minimum fan speed, click on "Continue" to set the maximum fan speed.
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Illustration 9 g02428396 - Continue running the machine at high idle. Use the photo tach to measure the fan speed. Adjust the current for the fan solenoid by using the arrows at the bottom of the screen. Increasing the current will decrease the fan speed. Decreasing the current will increase the fan speed. Adjust the current until the fan speed is 1250 ± 50 rpm.
Note: If the machine is equipped with the variable pitch fan, set the fan speed to 1470 ± 50 rpm.
Note: The procedure on the screen may specify a different value for the fan speed. Do not use this value. Set the fan speed according to the above instructions.
When the fan speed has been set properly, click the "Next" button in the lower left corner of the screen.
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Illustration 10 g02428438 - After setting the maximum fan speed, click on "Finish" to save calibration values. Exit ET.
Note: If fan speed cannot be raised to the maximum fan speed requirement, refer to Testing and Adjusting, "Piston Pump Cutoff Pressure (Hydraulic Fan) Test and Adjust".