JLG sky trak mmv Service Manual page 612

Electrical System
b. Calibration
1. Place the vehicle in the 0% calibration position, i.e.
vehicle level, brakes off, steering straight ahead,
boom retracted, 11k carriage with the forks lowered
but not resting on the ground, and no load on forks.
2. Turn off the ignition.
3. Press and hold the TEST button (1), and turn on the
ignition. The display will show all LEDs (2, 3 and 4)
ON and the sounder OFF. Keep holding the TEST
button (1) for 30 seconds until the display changes
again to show the red LED (4) only. This indicates
that the system is now in calibration mode, and
waiting for the first reference point. Release the
button. DO NOT turn off the ignition. If the button is
released too early the display will revert back to
normal operation. Short intermittent beeps will then
be emitted to indicate the system is waiting for an
input.
4. Check that the vehicle is still positioned correctly for
the 0% reference, and press the TEST button (1)
ONCE. The system will give a single, short beep
indicating that the 0% point is set. The display will
change to show one red LED (4) and one amber
LED (3) (and continuing intermittent beeps),
indicating that the system is ready and waiting for
the 100% reference. (NOTE - if a long beep is
emitted from the sounder during calibration, this
indicates a fault condition. Refer to Section 10.12.12,
c. Fault Conditions )
10.132
5. With the vehicle level, and the brakes OFF, pick up
the calibrated 6,000 lb load and extend until the front
of the backrest of the carriage is 16-ft from the front
of the front tires.
6. When in position, press the TEST button ONCE to
set the 100% reference. The display will again give a
single beep to confirm that it is set.
7. The display should now change back to normal
operation, and show 100%, i.e. all green and amber
LEDs lit and flashing.
8. System calibration has now been completed. No
further action is required.
Note: The system allows five minutes for each part of
the calibration procedure to be completed. During this
time the system will emit a short beep every five seconds
to remind the operator. If the calibration procedure is not
completed within the five minutes allowed, the system
will automatically revert to normal operation with the pre-
vious calibration settings. If the ignition is switched OFF
during calibration the system will automatically revert to
the previous calibration settings.
4
3
100%
2
TEST
1
5
OM1040
Model MMV Rev. 12-04