JLG M4069 Service Manual - Manual (Page 34)

SECTION 3 - CHASSIS & SCISSOR ARMS
3-2 – JLG Lift – 3121639
Some possible reasons that the tilt sensor will not cali-
brate are:
a. The surface the machine is sitting on is off level
by a few degrees (flat doesn’t imply level; park-
ing lots are often not level).
b. The tilt sensor has failed one or both of the
channels (X axis and Y axis).
c. Tilt sensor has moisture intrusion that has
shifted its output.
d. Water and/or corrosion in the box has corrupted
electrical connections or caused a tilt sensor or
ground control board failure (observe any
cracks in the box).
e. The Ground Control Box, as mounted on the
machine, does not allow the tilt sensor to be
level.
For the following troubleshooting steps, a bubble level
(smaller is better) will be needed and the machine must
be on a level surface:
1. On the Analyzer, go to Diagnostics/System and read
the tilt angle. If either angle reports +20.0°, there is
an electrical/electronic failure (tilt sensor, control
board, electrical connections).
a. Open the Ground Control Box.
b. Disconnect the sensor and clean any corrosion
off of the tilt sensor and control board connec-
tions.
c. Reassemble and test. If fault persists, replace tilt
sensor.
2. If the Analyzer displays angles other than +20.0°,
attempt to calibrate. If machine will not calibrate,
note the reason displayed on Analyzer:
a. SENSOR FAILURE – tilt sensor internal fre-
quency is out of range (replace sensor).
b. NOT LEVEL - tilt sensor has either developed an
offset or it is to unlevel as mounted on the
machine.
Joystick Calibration
Using the Analyzer, in Access Level 1, go to MENU: CALI-
BRATION: JOYSTICK and press ENTER.
1. Following the analyzer screen prompts:
a. Move the Joystick FORWARD and press ENTER.
b. Allow Joystick to be in CENTER position and
press ENTER.
c. Move the Joytstick REVERSE and press ENTER.
2. CAL COMPLETE or CAL FAILED will display on the
analyzer.
3. Possible reasons if calibration failed:
a. The forward position must be a lower voltage
than reverse position.
b. The difference between center and forward &
center and reverse must be atleast 1V.
1. Ground Control Box
2. Tilt Sensor
2
1