JLG 4394RT Service Manual - Manual (Page 213)

SECTION 5 - JLG CONTROL SYSTEM
3121249 – JLG Lift – 5-7
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 failure:
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.
Tilt Sensor Calibration:
1. Drive the machine onto a measured level surface
(±0.5° for both x and y axis).
2. Using the Analyzer, go to MENU: CALIBRATION;
TILT SENSOR. Press Enter. LEVEL VEHICLE will dis-
play. Press Enter again to calibrate.
3. Both axis’ raw angles need to be within ±5.0°, other-
wise the machine is too unlevel and the software will
prohibit calibration. Should this occur, attempt to
dissect the three areas of error to find the primary
contributor:
a. Machine mounting and/or grade:
With a digital level, measure the top of the
Ground Control box for levelness. If unable to
get a good reading, check the box’s mounting
surface for levelness.
b. Tilt sensor mounting on machine or wedged
crooked in control box:
If the machine mounting/grade appears accept-
able, open the Ground Control box carefully.
Observe whether the tilt sensor is properly
seated.
c. Tilt sensor has developed an offset shift:
Remove the tilt sensor from the Ground Control
box, but keep both the tilt sensor and Ground
Control box electrically connected. Level one
axis of the tilt sensor and observe the raw read-
ing (should be within ±2.0°). Do the same for the
other axis. If either axis is greater than ±2.0°,
replace the tilt sensor.
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
2
1
1. Ground Control Box 2. Digital Level
2
1
1. Ground Control Box 2. Tilt Sensor