24 Motor Grader Systems Caterpillar

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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 of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.

Introduction

The following procedure provides instructions for the calibration and adjustment of the hydraulic fan speed.

Specifications

Required Tools

Preparation for Calibration

1. Move the machine to a smooth, horizontal location. Move the machine away from other operating machines and away from personnel. Place the transmission direction control switch in the NEUTRAL position. Engage the parking brake. Lower the work tools to the ground. Stop the engine and put chocks in front of the wheels and behind the wheels.

2. Inspect the hoses for the fan drive for damage. Inspect all of the connectors for the fan drive for damage. Inspect all of the components for the fan drive for damage.
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   Illustration 1	g01366568

3. Remove grill assembly (1).

4. Attach Tool (A) to the fan.

5. Install the grill assembly (1).

6. Install Tool (B) on the grill assembly (1).

7. Start the engine and run the engine at low idle.

   Note: To ensure the proper operation of the cooling system, the doors for the engine enclosure should be closed while the test procedures are conducted.

8. Use Tool (C) in order to connect Caterpillar Electronic Technician (ET) to the machine.

9. Open Cat ET and check for active diagnostic codes. If there is an active diagnostic code, the calibration procedure will be stopped until the condition that caused the diagnostic code is corrected.

10. Once any active diagnostic codes are corrected, select the engine Electronic Control Module (ECM) from the available ECM list.

    Note: The following information is an example of the calibration procedure. The actual calibration screens may not be for your machine and the screens may vary as new versions of software are released.

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    Illustration 2	g01297189
    Typical example

11. Select the "Service" menu in order to begin the calibration procedure. Then select "Calibrations". A second menu will be displayed. Select "Engine Cooling Fan Calibration" from the second menu.
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    Illustration 3	g01113270
    Typical example

12. Read the warning and select "OK" when you are ready to proceed.
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    Illustration 4	g01113271
    Typical example

13. The next screen allows you to unselect the tests that are not required. Select the box next to the test that is not desired. The check in the check box will disappear when the test is unselected. The test for the nominal fan speed should not be performed. The test for the nominal fan speed is used for testing purposes only. The test for the maximum fan speed and the test for the minimum fan speed are the only tests that should be used. Once the desired tests have been selected, select "Begin".

14. Proceed to "Calibration for Maximum Fan Speed" if the test for the maximum fan speed was selected.

15. Proceed to "Calibration for Minimum Fan Speed" if the test for the minimum fan speed was selected.

Calibration for Fan Speed Solenoid

Calibration for Maximum Fan Speed

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Illustration 5	g00925401
Typical example

1. The next screen is the initial calibration screen. The screen displays the instructions for calibration. The top display area displays status parameters that are monitored during the calibration. The middle display area displays information about the status of the calibration. The display area on the bottom will display the conditions for the setup and the instructions for the calibration.
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   Illustration 6	g01286217

2. The display area will show the following conditions for the setup:

   • Set the parking brake.

   • Operate the engine at high idle. Use the throttle lock (4) in order to operate the engine at high idle.

   • Ensure that the hydraulic oil temperature exceeds 55 °C (131 °F).

3. Perform the following procedures in order to satisfy the conditions for setup.

   1. Ensure that the parking brake is engaged.

   2. Run the engine at high idle with the throttle lock.

   3. Monitor the hydraulic oil temperature with the Cat ET screen and stall a hydraulic function in order to increase the hydraulic oil temperature. Stall a hydraulic function by moving the function to the end of travel.

4. When the conditions for setup are satisfied, press the "Next>" button in order to start the calibration. If the conditions for the setup are not correct, the condition that is not correct will be display in the middle display area. The calibration will not start. When the conditions are correct, press the "Next>" button in order to start the calibration of the fan speed.

   Note: When the maximum fan speed is calibrated, the minimum signal will be sent to the hydraulic demand fan solenoid in order to obtain the maximum fan speed.

   Note: You can cancel the calibration at any time by pressing the "Cancel" button.

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   Illustration 7	g01113372
   Typical example

5. Record the fan speed. The maximum fan speed for your machine is shown in Table 3. Press button (5) or press button (6) at the bottom of the screen until the fan speed is approximately 1000 rpm. Then, press the button (5) at the bottom of the screen until the fan speed is correct.

   Note: When button (6) is pressed, the signal to the hydraulic demand fan solenoid will be increased. When the signal is increased, the fan speed will decrease. When button (5) is pressed, the signal to the hydraulic demand fan solenoid will be decreased. When the signal is decreased, the fan speed will increase.

   Note: When adjusting the maximum fan speed and the maximum is exceeded, decrease the fan speed to 1000 rpm and then increase the fan speed to the maximum fan speed in Table 3. This will allow the fan speed to be properly set.

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   Table 3

   Fan Speeds
   Maximum
   Sales Model	Standard	AWD	High Ambient
   24M	1300	NA	NA

6. The calibration procedure could be stopped for several reasons. Refer to the following table for the error codes that can be displayed by Cat ET. Correct the condition that caused the error code and restart the calibration.
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   Table 4

   Error Codes for the Calibration of the Fan Speed Solenoid
   Error Code	Description	Procedure
   0002	Active diagnostic present	There is an active diagnostic code. Exit the calibration and correct the condition that caused the diagnostic code.
   0006	Calibration aborted by tool/monitor	The calibration has been stopped by Cat ET. Restart the calibration procedure.
   0009	Calibration aborted by ECM	The calibration has been stopped by the ECM. Restart the calibration procedure.
   1010	Engine stopped	The engine has stopped. Restart the engine and set the engine to high idle.
   1012	Engine rpm incorrect	The engine rpm is not correct. Set the engine rpm to high idle.
   1018	Parking brake not engaged	The parking brake is not engaged. Set the parking brake.
   1020	Transmission gear incorrect	The transmission gear is not correct. The transmission must be in NEUTRAL.
   1048	Hydraulic oil temperature too low	The hydraulic oil temperature is too low. Repeat the procedure to increase the hydraulic oil temperature.
   1054	Hydraulic oil temperature too high	The hydraulic oil temperature is too high. Decrease engine speed and ensure that the doors for the engine enclosure are closed.
   1074	Engine rpm too low	The engine rpm is too low. Set the engine rpm to high idle.

7. Once the maximum fan speed is correct, press the "Next>" button in order to complete the test.
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   Illustration 8	g00925396
   Typical example

8. The next screen will show that the test was successful. Select "Continue" in order to proceed.

9. If the test for the minimum fan speed was selected, proceed to "Calibration for Minimum Fan Speed". If the test for the minimum fan speed was not selected, disengage the throttle lock and stop the engine.

10. Remove the test equipment.

Calibration for Minimum Fan Speed

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Illustration 9	g00925407
Typical example

1. The next screen is the initial calibration screen. The screen displays the instructions for calibration. The top display area displays status parameters that are monitored during the calibration. The middle display area displays information about the status of the calibration. The display area on the bottom will display the conditions for the setup and the instructions for the calibration.
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   Illustration 10	g01286217

2. The display area will show the following conditions for the setup:

   • Set the parking brake.

   • Operate the engine at high idle. Use the throttle lock (4) in order to operate the engine at high idle.

   • Ensure that the hydraulic oil temperature exceeds 55 °C (131 °F).

3. Perform the following procedures in order to satisfy the conditions for setup.

   1. Ensure that the parking brake is engaged.

   2. Run the engine at high idle with the throttle lock.

   3. Monitor the hydraulic oil temperature with the Cat ET screen and stall a hydraulic function in order to increase the hydraulic oil temperature. Stall a hydraulic function by moving the function to the end of travel.

4. When the conditions for setup are satisfied, press the "Next>" button in order to start the calibration. If the conditions for the setup are not correct, the condition that is not correct will be display in the middle display area. The calibration will not start. When the conditions are correct, press the "Next>" button in order to start the calibration of the fan speed.

   Note: When the minimum fan speed is being calibrated, the maximum signal will be sent to the hydraulic demand fan solenoid in order to obtain the minimum fan speed.

   Note: You can cancel the calibration at any time by pressing the "Cancel" button.

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   Illustration 11	g01113372
   Typical example

5. Record the fan speed. Press button (5) or press button (6) at the bottom of the screen until the fan speed is approximately 1000 rpm. Then, press the button (6) at the bottom of the screen until the fan speed is correct. The minimum fan speed is 60 rpm.

   Note: When button (6) is pressed, the signal to the hydraulic demand fan solenoid will be increased. When the signal is increased, the fan speed will decrease. When button (5) is pressed, the signal to the hydraulic demand fan solenoid will be decreased. When the signal is decreased, the fan speed will increase.

   Note: When adjusting the minimum speed of the fan and the minimum speed is exceeded, increase the speed of the fan to 1000 rpm and then decrease the speed of the fan to 60 rpm. This will allow the fan speed to be properly set.

6. The calibration procedure could be stopped for several reasons. Refer to the following table for the error codes that can be displayed by Cat ET. Correct the condition that caused the error code and restart the calibration.
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   Table 5

   Error Codes for the Calibration of the Fan Speed Solenoid
   Error Code	Description	Procedure
   0002	Active diagnostic present	There is an active diagnostic code. Exit the calibration and correct the condition that caused the diagnostic code.
   0006	Calibration aborted by tool/monitor	The calibration has been stopped by Cat ET. Restart the calibration procedure.
   0009	Calibration aborted by ECM	The calibration has been stopped by the ECM. Restart the calibration procedure.
   1010	Engine stopped	The engine has stopped. Restart the engine and set the engine to high idle.
   1012	Engine rpm incorrect	The engine rpm is not correct. Set the engine rpm to high idle.
   1018	Parking brake not engaged	The parking brake is not engaged. Set the parking brake.
   1020	Transmission gear incorrect	The transmission gear is not correct. The transmission must be in NEUTRAL.
   1048	Hydraulic oil temperature too low	The hydraulic oil temperature is too low. Repeat the procedure to increase the hydraulic oil temperature.
   1054	Hydraulic oil temperature too high	The hydraulic oil temperature is too high. Decrease engine speed and ensure that the doors for the engine enclosure are closed.
   1074	Engine rpm too low	The engine rpm is too low. Set the engine rpm to high idle.

7. Once the minimum fan speed is correct, press the "Next>" button in order to end the calibration of the fan speed.
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   Illustration 12	g00925409
   Typical example

8. The next screen will show that the test was successful. Select "Continue" in order to proceed.

9. Disengage the throttle lock and stop the engine.

10. Remove the test equipment.