992G Wheel Loader Electrohydraulic System Caterpillar

Position Sensor (Lift Linkage) - Calibrate

Usage:

992G AZX

Calibration of the lift linkage position sensor must be performed after any of the following events occur:

Initial commission of the machine
Replacement of a lift linkage position sensor
The sensor mount, the lift cylinder, or the lift 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.

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.

Position the bucket on the ground.

Engage the parking brake.

Run the engine at low idle.

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.

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) .

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

Table 1
"SELECT CALIBRATION" "LFT LINK SNSR - CAL"

The "LFT LINK SNSR - CAL" message will be displayed on the diagnostic message screen (2). Press "OK" in order to start the calibration. All the instructions for the calibration will be displayed on the screen.
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Table 2
"LFT LINK SNSR - CAL"
"PRESS [OK] TO START"

Table 2
"LFT LINK SNSR - CAL" "PRESS [OK] TO START"

In this step, raise the boom to the end of travel. Then, press the "OK" key.
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Table 3
"RAISE BOOM FULLY"
"THEN PRESS [OK]"

Table 3
"RAISE BOOM FULLY" "THEN PRESS [OK]"

In this step, extend the lift cylinders to the full RAISE position. Then press the "OK" key.
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Table 4
"EXTND LFT CYLS FULLY"
"THEN PRESS [OK]"

Table 4
"EXTND LFT CYLS FULLY" "THEN PRESS [OK]"

If the screen displays "RESULTS OK", proceed to the next step. If the calibration has failed, proceed to Step 17.
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Table 5
"RESULTS OK"

Table 5
"RESULTS OK"

In this step, position the bucket to the full TILT BACK position. Then, press the "OK" key.
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Table 6
"TILT BKT BACK FULLY"
" THEN PRESS [OK]"

Table 6
"TILT BKT BACK FULLY" " THEN PRESS [OK]"

Lower the lift linkage to the full LOWER position. Then, press the "OK" key.
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Table 7
"LOWER BOOM FULLY"
" THEN PRESS [OK]"

Table 7
"LOWER BOOM FULLY" " THEN PRESS [OK]"

Ensure that the lift cylinders are at the end of travel at the LOWER position. Then press the "OK" key.
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Table 8
"BOTTOM OUT LIFT CYLS"
" THEN PRESS [OK]"

Table 8
"BOTTOM OUT LIFT CYLS" " THEN PRESS [OK]"

If the screen displays "RESULTS OK", proceed to Step 19. If the calibration has failed, proceed to Step 18.
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Table 9
"RESULTS OK"

Table 9
"RESULTS OK"

If the calibration passes, the screen displays "CALIBRATION COMPLETED OK". Proceed to Step 19.
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Table 10
"CALIBRATION"
"COMPLETED OK"

Table 10
"CALIBRATION" "COMPLETED OK"

If the calibration has failed, the screen displays "CALIBRATION FAILED". Press the "OK" key for the reason of the failure.
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Table 11
"CALIBRATION FAILED"
"PRESS [OK] FOR REASON"
1. If the screen displays "LIFT LINKAGE SNSR ERR", the problem is with the sensor circuit. The lift 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. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 12
  "LIFT LINK SNSR ERR"
  "CHECK SNSR/CAL/WIRING"
  
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  Table 13
  "PRESS [OK]"
  "TO ACKNOWLEDGE"
1. When the display shows "SENSOR ABOVE RANGE", the calibration indicates that the percent of duty cycle is above the specification. The lift linkage may not be moved to the correct range. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 14
  "SENSOR ABOVE RANGE"
  "(65.0) XXX.X (92.0)"
  
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  Table 15
  "PRESS [OK]"
  "TO ACKNOWLEDGE"
1. When the display shows "SENSOR BELOW RANGE", the calibration indicates that the percent of duty cycle is below the specification. The lift linkage may not be moved to the correct range. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 16
  "SENSOR BELOW RANGE"
  "(65.0) XXX.X% (92.0)"
  
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  Table 17
  "PRESS [OK]"
  "TO ACKNOWLEDGE"

Table 11
"CALIBRATION FAILED" "PRESS [OK] FOR REASON"

Table 12
"LIFT LINK SNSR ERR" "CHECK SNSR/CAL/WIRING"

Table 13
"PRESS [OK]" "TO ACKNOWLEDGE"

Table 14
"SENSOR ABOVE RANGE" "(65.0) XXX.X (92.0)"

Table 15
"PRESS [OK]" "TO ACKNOWLEDGE"

Table 16
"SENSOR BELOW RANGE" "(65.0) XXX.X% (92.0)"

Table 17
"PRESS [OK]" "TO ACKNOWLEDGE"

If the calibration has failed, the screen will display "CALIBRATION FAILED". Press the "OK" key for the reason of the failure.
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Table 18
"CALIBRATION FAILED"
"PRESS [>] FOR REASON"
1. If the screen displays "LIFT LINKAGE SNSR ERR", the problem is with the sensor circuit. The lift 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. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 19
  "LIFT LINK SNSR ERR"
  "CHECK SNSR/CAL/WIRING"
  
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  Table 20
  "PRESS [OK]"
  "TO ACKNOWLEDGE"
1. When the display shows "SENSOR ABOVE RANGE", the calibration indicates that the percent of duty cycle is above the specification. The tilt linkage may not be moved to the correct range. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 21
  "SENSOR ABOVE RANGE"
  "8.0 XXX.X% (45.0)"
  
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  Table 22
  "PRESS [OK]"
  "TO ACKNOWLEDGE"
1. When the display shows "SENSOR BELOW RANGE", the calibration indicates that the percent of duty cycle is above the specification. The tilt linkage may not be moved to the correct range. The display will advance. Then, press the "OK" key in order to acknowledge the error.
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  Table 23
  "SENSOR ABOVE RANGE"
  "8.0 XXX.X% (45.0)"
  
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  Table 24
  "PRESS [OK]"
  "TO ACKNOWLEDGE"

Table 18
"CALIBRATION FAILED" "PRESS [>] FOR REASON"

Table 19
"LIFT LINK SNSR ERR" "CHECK SNSR/CAL/WIRING"

Table 20
"PRESS [OK]" "TO ACKNOWLEDGE"

Table 21
"SENSOR ABOVE RANGE" "8.0 XXX.X% (45.0)"

Table 22
"PRESS [OK]" "TO ACKNOWLEDGE"

Table 23
"SENSOR ABOVE RANGE" "8.0 XXX.X% (45.0)"

Table 24
"PRESS [OK]" "TO ACKNOWLEDGE"

After three seconds, the screen will display "EXITING CALIBRATION". After three seconds, exit the calibration.
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Table 25
"EXITING"
"CALIBRATION"