JLG 4017 Service Manual - Manual (Page 145)

9.25 4017
Electrical System
9.11.10 Load Moment Indicator
The Load Moment Indicator (1) provides a visual
indication for stability limitations. If the LMI senses that
the machine is becoming unstable, an audible and visual
alarm will begin to sound and the boom lower, boom
extension and outriggers functions will be prohibited.
Depending on the circumstance, the LMI can be
overridden by pressing the "overload shut-off" button on
the display panel.
Note: The Load Moment Indicator is NOT a serviceable
item. The Load Moment Indicator must be inspected
and/or replaced by a qualified dealer or JLG technician
9.11.11 Load Moment Sensor
The Load Moment Sensor (2) is bolted on the top right of
the rear axle.
a. Load Moment Sensor Removal
1. Open engine cover. Allow engine to cool.
2. Disconnect the negative (-) battery cable at the
negative (-) battery terminal.
3. Disconnect the LMI electrical connector.
4. Loosen and remove the two bolts holding the Load
Moment Sensor to the rear axle.
5. Remove the sensor assembly.
b. Load Moment Sensor Installation
1. Clean the bare metal with a degreasing solution and
allow to dry.
2. Apply a thin film of Loctite ® 638 adhesive to the flat
metal surface of the transducer, ensuring the
adhesive is spread evenly over the entire surface.
3. Fit the transducer, ensuring the lead exits in the
corner direction. If the existing bolts are not
available, use M10 x 40 mm bolts with a minimum
tensile strength of 10.9. No washers are used.
Note: It is important to prevent distortion of the sensor
element, therefore tighten the bolts alternately a small
amount at a time, until a value of 70 Nm (50 lb-ft) is
achieved.
4. Leave the machine undisturbed for a minimum of
2 hours before moving. DO NOT lift any load for a
minimum of 12 hours.
5. The transducer and area around it can be painted
2 hours after installation.
6. Plug the electrical connector into the sensor
assembly.
7. Connect the negative (-) battery cable to the negative
(-) battery terminal.
8. Close and secure engine cover.
c. Load Moment Sensor Calibration
Calibration of the load moment sensor requires the
setting up of two reference points. 0% and 100% SWL.
During calibration the machine must be level, brakes off,
steering straight ahead and ignition turned on. Access to
the calibration mode requires the use of a magnetic "key".
• Acquiring the calibration mode
1. For the first calibration at installation:
When first installed and powered up, the display will
show error condition number 4 (red LED and 3rd
green LED), indicating that calibration is required.
PRESS and hold the TEST button, and place the
magnet in position level with and just to the right of
the TEST button. The correct position is indicated
when the sounder stops and all LEDs stay on.
KEEP HOLDING THE TEST BUTTON AND
MAGNET IN PLACE until the display changes again
to show the red LED only. This indicates that the
system is now in calibration mode, and waiting for the
first reference point.
RELEASE the TEST button and remove the magnet-
the display will emit short intermittent beeps to
remind the operator that calibration is in progress.
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