JLG 723A Service Manual - Manual (Page 147)

9.39 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Electrical System
9.14.10 Boom Angle Sensor
The boom angle sensor is located at the top left inside
rear of the boom.
a. Boom Angle Sensor Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever in (N)
NEUTRAL, engage the park brake and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the engine to cool.
4. Properly disconnect the battery.
5. Disconnect the boom angle sensor electrical
connector.
6. Loosen and remove the nut holding the rod
assembly (1) to the sensor arm.
7. Loosen and remove the two bolts (2) holding the
sensor to the sensor bracket.
8. Remove the sensor assembly.
9. If necessary, remove the sensor bracket.
b. Boom Angle Sensor Inspection and Replacement
Inspect the sensor and the wiring harness connector
terminals for continuity. Replace a defective or faulty
sensor with a new sensor.
c. Boom Angle Sensor Installation
1. If necessary, install the sensor bracket.
2. Install the sensor assembly to the sensor seat and
tighten both bolts.
3. Install the rod end to the sensor arm and tighten nut.
4. If necessary, measure and set the rod length as
required.
5. Plug the electrical connector into the sensor
assembly.
6. Properly connect the battery.
7. Close and secure the engine cover.
8. Remove the Do Not Operate Tag from the ignition
key switch and the steering wheel.
d. Boom Angle Sensor Adjustment
1. Access Level 2 can be reached by pressing buttons
C and OK at the same time.
2. Enter Access Level 2 password 33271.
3. Choose Calibration menu and select “Boom Angle”.
4. Press OK button when asked “Calibrate Boom Angle
Sensor?”.
5. Follow prompts. First move boom to lowest position,
press OK button.
6. Follow prompts. Move boom to highest position,
press OK button.
7. If calibration is successful, Analyzer will indicate
“Calibration: Complete”.
If calibration fails, Analyzer will indicate “Calibration
Failed”. The boom angle sensor position may need
to be adjusted or the boom sensor rod may need
adjusted.
A
MZ5590
1
2906H SHOWN
SHOWN AT BOOM MID-TRAVEL POSITION
2
Machine Rod Length (A)
L2906H, 2906H,
29.6 & 619A
141,6 ±0,5 mm (5.57 ± 0.02 in)
3507H, 35.7 &
723A
196,1 ±1 mm (7.72 ± 0.02 in)