JLG 1230ES Service Manual - Manual (Page 131)

SECTION 7 - JLG CONTROL SYSTEM
3121222 – JLG Lift – 7-13
7.5 TILT SENSOR ELECTRICAL EVALUATION
This basic check using the JLG Analyzer can be used to
test the Tilt Sensor.
• If angle measurements read +20.0, then a sensor/
wiring/connector fault exists. If the readings intermit-
tently display expected angles, then there is likely a
wiring/connector problem and not a failed sensor. In
either case, open the ES Ground box. Disconnect the
sensor, check the wire terminations, and clean any cor-
rosion on the tilt sensor and control board connec-
tions. Reconnect and test. If the fault persists, replace
the tilt sensor and return the faulty tilt sensor to JLG
with a detailed description of the diagnostic steps
taken.
7.6 ELEVATION ANGLE SENSOR ELECTRICAL
EVALUATION
These basic checks using the JLG Analyzer can be used
to test the Elevation Atrecrqwetngle Sensor. If the prob-
lem is still occurring, perform the Tilt vs. Allowed Height
Evaluation described below.
• On a level surface, with the Analyzer under DIAG-
NOSTICS/ELEV SENSOR, verify that the elevation
angle sensor voltage increases (ranges from 0.2V-
0.8V to 3.6V-4.2V) with platform height. If not, check
the sensor mounting. If necessary, unbolt sensor and
rotate by hand while monitoring with the Analyzer to
check the integrity of the sensor output.
• For machines equipped with an elevation proximity
switch, if the Elevation Sensor appears satisfactory,
verify that the Elevation Prox switch is opening and
closing appropriately by watching the change of state
between the stowed and elevated positions (monitor
PROX SWITCH under DIAGNOSTICS/ELEV SENSOR).
If a change of state is not observed, check prox mount-
ing and operability by placing metal in front of the prox
sensor face.
Tilt vs. Allowed Height Evaluation
First, find a level surface (not just flat like a parking lot;
must be level). The surface should be a plane in which the
wheels are within 0°±0.2°. Find this surface by taking a
digital level and measuring the areas on which the wheels
would rest in both the X and Y directions. Mark the loca-
tions and drive the machine to these points. If a level sur-
face can not be found, flat shims or plates may be place
under the wheels to create a level plane for the wheels.
In determining the existing tilt angle, read the angle on the
Analyzer under DIAGNOSTICS/SYSTEM. Do not place a
hand-held level on the machine to determine whether the
machine is level and lifting to the appropriate height. Such
a measurement will likely be different than the Ground
box/tilt sensor angle reading due to manufacturing and
mounting tolerances. The tilt angle in both directions
should read within ±0.5° while on a level surface. If not,
then either the machine has a drifting tilt sensor or has
been erroneously re-calibrated since the original factory
calibration.
Check the service records to determine whether a re cali-
bration has been performed. If so, re-calibrate on the level
surface. If there is no record of an earlier calibration, we
must assume that the sensor output has drifted. There-
fore, replace the sensor and return to JLG with a detailed
troubleshooting description.
NOTE: There is a rare case in which an attempted calibra-
tion will be unsuccessful for machines with Ground
module software version P1.5 or earlier. If this
occurs while performing a calibration, the Analyzer
will display:
LEVEL VEHICLE
TILT +20.0 +20.0
and the following fault will also be logged.
TILT SENSOR NOT CALIBRATED (2/3) [DTC 811]
If no other faults have been logged since the last startup,
this fault indicates that the software needs to be updated
to P1.6 or later. Update the software and continue trouble-
shooting evaluation before replacing any components.
If the tilt sensor readings are within range for a level
machine, compare the allowed Tilt vs. Height in the chart
below. Being within 6” of the target height is considered
acceptable.
If the machine does not appear to track the lift cutout
heights and no fault exists as described above, stow the
machine and re-calibrate the Elevation Sensor.
7.7 ELEVATION SENSOR CALIBRATION
1. Be sure that the machine is parked and stowed on
level ground.
2. Attach the analyzer near the ground control station.
3. Go to Access Level 1 and scroll through to CALI-
BRATION.
4. Under Calibrations go to SET ELEV SENSOR.
5. Press enter for Yes and the Elevation Sensor will set.
NOTE: Check the elevation sensor by lifting the scissor
arms, from the platform, and driving until the drive
speed cuts back. Refer to the Maximum High Drive
Cut Out Height table in section 1 of this manual for
proper speed cut out height.
Table 7-5. Tilt Cutout Settings
1230ES
Tilt Setting
(front to back)
Tilt Setting
(side to side)
ANSI/CSA 3° 1.5°
CE/AUS 3.4° 3.4°