JLG G12-55A AccuPlace Service Manual - Manual (Page 153)

9.35 G10-55A & G12-55A AccuPlace
Electrical System
7. Remove the bolts holding the sensor to the sensor
mount.
8. Remove the boom length sensor.
9. If necessary, remove the sensor cover from the
mounting bracket by removing the bolts.
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 sensor
mount.
2. Connect the cable latch to the appropriate point on
the third boom section.
3. Connect the boom length 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.”
9.12 DISPLAY MONITOR AND GAUGES
9.12.1 3-N-1 Digital Gauge
The 3-N-1 gauge (8) is located on the center dash panel.
The digital display in the center of the gauge displays the
operating hours, voltmeter and engine speed on the left
hand side and engine fault codes or machine diagnostic
trouble codes (DTC’s) on the right hand side. Engine fault
codes (9) will be displayed with the engine fault symbol
(10) and the numeric fault code value below the symbol.
Machine DTC’s (11) will be displayed with the machine
fault symbol (12) and the numeric DTC value above the
symbol.
Note: For detailed machine DTC listings, refer to
Section 9.15.8, “Diagnostic Trouble Code (DTC) Table.”
Note: For engine fault codes, contact a local Perkins
Engine Distributor.
a. Gauge 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 system fluids to
cool.
4. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
5. Remove the screws (7) securing the dash panel.
6. Label and disconnect the wires from the gauge,
remove the gauge bracket.
7. Pull the gauge out from the dash.
b. Disassembly
DO NOT disassemble the gauge. The gauge is not
serviceable. Replace the gauge if found to be defective.
c. Gauge Installation and Testing
1. Install the gauge in the dash. Install the gauge
bracket.
2. Connect the previously labeled wires to the gauge.
MAP0300
7
8
XXXXXX.X
XX.X V
XXXX RPM
XXX.XX
XXXXXX.X
XX.X V
XXXX RPM
XXXX
MAP0640
9
11
10
12