JLG 1230ES Service Manual - Manual (Page 130)

SECTION 7 - JLG CONTROL SYSTEM
7-12 – JLG Lift – 3121222
7.4 TILT SENSOR CALIBRATION
Be sure that the machine is parked and stowed on level
ground.
Ground Module Software Version 1.5
1. Enter Access Level 1 and go to the CALIBRATION/
TILT SENSOR/LEVEL VEHICLE screen.
2. Choose the right arrow key to view the raw, uncali-
brated tilt sensor values. If either raw angle reads
±5.0 or more, the machine is too unlevel and the
software will prohibit calibration. Therefore, attempt
to dissect the three areas of error to find the primary
contributor:
a. Machine mounting and/or grade:
Try to measure the top of the Ground Control
box for levelness. If unable to get a good read-
ing, unbolt the Ground Control box and 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, remove and open the Ground Control box
carefully. Observe whether the tilt sensor is prop-
erly seated in its grooves.
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.
Ground Module Software Version 1.4
1. Enter Access Level 1 and go to the CALIBRATION/
TILT SENSOR/LEVEL VEHICLE screen.
2. Choose the right arrow key to view the raw, uncali-
brated tilt sensor values. If either raw angle reads
±5.0 or more, the machine is too unlevel and the
software will prohibit calibration. Therefore, attempt
to dissect the three areas of error to find the primary
contributor:
a. Machine mounting and/or grade:
Try to measure the top of the Ground Control
box for levelness. If unable to get a good read-
ing, unbolt the Ground Control box and 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, remove and open the Ground Control box
carefully. Observe whether the tilt sensor is prop-
erly 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.
Calibration Failures
Some possible reasons that the tilt sensor won’t calibrate
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 the 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. Take the Ground Control box off of the machine
and open.
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 won’t 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 too unlevel as mounted on the
machine.