JLG G12-55A AccuPlace Service Manual - Manual (Page 151)

9.33 G10-55A & G12-55A AccuPlace
Electrical System
1. If the fuel level indicator needle does not move,
check the fuel tank for fuel.
2. Check for loose or defective wiring, faulty ground
connections, and corrosion on the fuel tank sender
and wiring lead.
3. If the fuel level indicator needle does not move after
the ignition key switch is turned to the RUN position,
use a test lamp to determine whether current is
flowing from the ignition switch to the fuel level
sender.
4. If the fuel level indicator does not move and a faulty
or defective fuel level sender in the fuel tank has
been ruled out, and in addition, wiring and
connectors have been checked and ruled out, the
fuel level indicator is defective and must be replaced.
5. Check that the ignition terminal has current and that
the fuse in the fuse panel is not blown.
6. Check for broken, shorted, frayed, disconnected or
damaged wiring between the fuel level indicator
wiring at the cab, fuse and relay panel, ignition key
switch, and from the fuel level sender on the fuel
tank through the wiring in the cab.
7. Check the fuel level sender. A defective fuel level
sender in the fuel tank may also prevent the fuel
level indicator from moving. Refer to Section 9.6,
“Electrical System Schematics And Diagrams,” for
further information.
9.11.12 Boom Angle Sensors
The sensors located on both sides at the rear of the boom
are used to measure the boom angle. The sensor on the
left side of the boom is CAN-based and is the primary
sensor. The sensor on the right side of the boom is a
backup or check of the primary sensor.
Left Side:
a. Left Side 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 engine cover. Allow system fluids to cool.
4. Disconnect the negative (-) battery cable at the
negative (-) battery terminal.
5. Remove the screw attaching the crank arm (2) to the
sensor shaft and remove the crank arm.
6. Remove the sensor cover by removing the bolts.
7. Unplug the wiring harness from the boom angle
sensor (1).
8. Remove the bolts holding the sensor to the mounting
bracket.
9. Remove the boom angle sensor.
b. Disassembly
1. Inspect the sensor and the wiring harness connector
terminals for continuity. Replace a defective or faulty
sensor with a new sensor.
c. Installation
1. Install the bolts holding the sensor to the mounting
bracket.
2. Align the holes on the crank arm and sensor shaft
and install the screw to secure crank arm in place.
Apply Loctite
® 222 and torque to 16 lb-in (18.4 cm
kg).
3. Connect the boom angle sensor to the wiring
harness.
4. Connect the negative (-) battery cable to the negative
(-) battery terminal.
5. Close and secure engine cover.
The sensor must be calibrated after installation. Refer to
Section 9.15.5, “Calibrations.”
MAP0470
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