992G Wheel Loader Electrohydraulic System Caterpillar

• Initial commission of the machine

• Replacement of a tilt linkage position sensor

• The sensor mount, the tilt cylinder, or the tilt linkage are disturbed.

• New implement software is installed.

• replacement of the implement electronic control module (ECM)

Note: The messages that appear on the diagnostic message screen may differ from the messages that are listed in this procedure.

Reference: For more information on messages that appear on the diagnostic message screen, refer to the "Calibration Messages" section of Testing and Adjusting, "Glossary of Terms" in this manual.

1. Park the machine on a smooth, level surface. Also, the area must be clear so that the bucket can be fully raised and fully lowered. The machine must be clear of all machines and personnel.

2. Position the bucket on the ground.

3. Engage the parking brake.

4. Run the engine at low idle.

5. If the machine is equipped with ride control, move the ride control switch to the OFF position.

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Illustration 1	g00284487
Right Console (1) Keypad.

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Illustration 2	g00286975
Front Dash (2) Diagnostic message screen.

6. Press the "OK" key on keypad (1) repeatedly in order to clear any error messages that are flashing on the display. Press the "OK" key on keypad (1) repeatedly until the hour meter appears on diagnostic message screen (2) .

7. On the keypad, enter "SERV (7378)" and then press the "OK" key. Press the ">" key until "TLT LINK SNSR - CAL" is displayed on the bottom line of the diagnostic message screen.
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   Table 1

   "SELECT CALIBRATION" "TLT LINK SNSR - CAL"

8. The "TLT LINK SENSR - CAL" message will be displayed on the diagnostic message screen. All the instructions for the calibration will be displayed on the screen. Press "OK" in order to start the calibration.
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   Table 2

   "TLT LINK SNSR - CAL" "PRESS [OK] TO START"

9. In this step, position the bucket in the full TILT BACK position. Then, press the "OK" key.
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   Table 3

   "TILT BKT BACK FULLY" "THEN PRESS [OK]"

10. In this step, move the boom to the full LOWER position. Then, press the "OK" key.
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    Table 4

    "LOWER BOOM FULLY" "THEN PRESS [OK]"

11. In this step, ensure that the lift cylinders are at the full LOWER position. Then, press the "OK" key.
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    Table 5

    "BOTTOM OUT LIFT CYLS" "THEN PRESS [OK]"

12. If the screen displays "RESULTS OK", proceed to the next step. If the calibration has not passed, proceed to Step 18.
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    Table 6

    "RESULTS OK"

13. In this step, position the lift linkage to the full RAISE position. Then, press the "OK" key.
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    Table 7

    "RAISE BOOM FULLY" "THEN PRESS [OK]"

14. In this step, extend the lift cylinders to the full RAISE position. Then press the "OK" key.
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    Table 8

    "EXTND LFT CYLS FULLY" "THEN PRESS [OK]"

15. In this step, position the bucket to the full TILT BACK position. Then, press the "OK" key.
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    Table 9

    "TILT BKT FWD FULLY" " THEN PRESS [OK]"

16. If the screen displays "RESULTS OK", proceed to Step 17. If the calibration has failed, proceed to Step 19.
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    Table 10

    "RESULTS OK"

17. If the calibration passes, the screen will display "CALIBRATION COMPLETED OK".
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    Table 11

    "CALIBRATION" "COMPLETED OK"

18. If the calibration has failed, the screen will display "CALIBRATION FAILED".
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    Table 12

    "CALIBRATION FAILED" "PRESS [>] FOR REASON"

    1. If the screen displays "TILT LINKAGE SNSR ERR", the problem is in the sensor circuit. The tilt linkage position sensor has one of the following conditions. no signal, wrong frequency, out of calibration and wiring problem. The problem must be repaired before the calibration can be completed. Then, press the "OK" key in order to acknowledge the error.
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       Table 13

       "TLT LINK SNSR ERR" "CHECK SNSR/CAL/WIRING"

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       Table 14

       "PRESS [OK]" "TO ACKNOWLEDGE"

    2. When the screen displays "SENSOR ABOVE RANGE", the calibration indicates that the percent of duty cycle is above the specification. The tilt linkage may not have been moved into the range. Then, press the "OK" key in order to acknowledge the error.
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       Table 15

       "SENSOR ABOVE RANGE" "(65.0) XXX.X% (92.0)"

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       Table 16

       "PRESS [OK]" "TO ACKNOWLEDGE"

    3. When the screen displays "SENSOR BELOW RANGE", the calibration indicates that the percent of duty cycle is above the specification. The tilt linkage may not have been moved into the range. Then, press the "OK" key in order to acknowledge the error.
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       Table 17

       "SENSOR BELOW RANGE" "(65.0) XXX.X% (92.0)"

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       Table 18

       "PRESS [OK]" "TO ACKNOWLEDGE"

19. If the calibration has failed, the screen will display "CALIBRATION FAILED".
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    Table 19

    "CALIBRATION FAILED" "PRESS [>] FOR REASON"

    1. If the screen displays "TILT LINKAGE SNSR ERR", the problem is with the sensor circuit. The tilt linkage position sensor has one of the following conditions. no signal, wrong frequency, out of calibration and wiring problem. The problem must be repaired before the calibration can be completed. Then, press the "OK" key in order to acknowledge the error.
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       Table 20

       "TLT LINK SNSR ERR" "CHECK SNSR/CAL/WIRING"

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       Table 21

       "PRESS [OK]" "TO ACKNOWLEDGE"

    2. When the screen displays "SENSOR ABOVE RANGE", the calibration indicates that the percent of duty cycle is above the specification. The tilt linkage may not have been moved into the range. Then, press the "OK" key in order to acknowledge the error.
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       Table 22

       "SENSOR ABOVE RANGE" "(8.0) XXX.X (45.0)"

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       Table 23

       "PRESS [OK]" "TO ACKNOWLEDGE"

    3. When the screen displays "SENSOR BELOW RANGE", the calibration indicates that the percent of duty cycle is below the specification. The tilt linkage may not have been moved into the range. Then, press the "OK" key in order to acknowledge the error.
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       Table 24

       "SENSOR BELOW RANGE" "(8.0) XXX.X% (45.0)"

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       Table 25

       "PRESS [OK]" "TO ACKNOWLEDGE"

20. After three seconds, the screen will display "EXITING CALIBRATION" screen. After three seconds, exit the calibration.
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    Table 26

    "EXITING" "CALIBRATION"

Note: The tilt linkage position sensor is calibrated.