JLG 4394RT Service Manual - Manual (Page 214)

SECTION 5 - JLG CONTROL SYSTEM
5-8 – JLG Lift– 3121249
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 too unlevel as mounted on the
machine.
Tilt Sensor
NOTE: Refer to Figure 5-5., Tilt Sensor Removal for num-
bers in parenthesis.
1. Disconnect the batteries.
2. Open the Ground Control Box to gain access to the
Tilt Sensor Assembly.
3. Remove the four Screws (3), Lockwashers (4),
Standoff Insulators (5), and Washers (6) to remove
the Tilt Sensor (1) and Sensor Mount (2) from the
Ground Control Box.
4. The Tilt Sensor (1) can be removed from the Sensor
Mount (2) by removing the three Screws (7).
NOTE: Follow the above procedures in reverse order when
installing the tilt sensor assembly. After installing, be
sure to calibrate the tilt sensor (refer to Section 5.2,
Calibrations).
2
1
1. Ground Control Box
2. Tilt Sensor Assembly (JLG P/N 1810140)
Figure 5-4. Tilt Sensor Location
Table 5-1. Tilt Sensor Harness
Wire Color Function Connector Pin
Red VCC 1
Green PWMX 2
White PWMY 3
Black Ground 4
1
2
3
5
6
4
7
1. Tilt Sensor (JLG P/N 4000021)
2. Sensor Mount
3. Screw, 6-32 x 1
4. Lockwasher
5. Standoff Insulator
6. Washer, 0.313 x 0.250 Nylon
7. Screw, M3.5 x 0.6 x 10
Figure 5-5. Tilt Sensor Removal