JLG 1230ES Service And Maintenance Manual Download

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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

Enter Access Level 1 and go to the CALIBRATION/
TILT SENSOR/LEVEL VEHICLE screen.

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
acceptable, remove and open the Ground
Control box carefully. Observe whether the tilt
sensor is properly seated in its grooves.

c. Tilt sensor has developed an offset shift:

Remove the tilt sensor from the Ground Con-
trol box but keep both the tilt sensor and
Ground Control box electrically connected.
Level one axis of the tilt sensor and observe
the raw reading (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

Enter Access Level 1 and go to the CALIBRATION/
TILT SENSOR/LEVEL VEHICLE screen.

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
acceptable, remove and open the Ground
Control box carefully. Observe whether the tilt
sensor is properly seated.

c. Tilt sensor has developed an offset shift:

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;
parking 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 cor-

rupted 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:

On the Analyzer, go the Diagnostics/System and
read the tilt angle. If either angle r20.0°,
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 corro-

sion off of the tilt sensor and control board
connections.

c. Reassemble and test. If fault persists, replace

tilt sensor.

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.