JLG G12-55A AccuPlace Service Manual - Manual (Page 145)

9.27 G10-55A & G12-55A AccuPlace
Electrical System
c. Installation and Testing
1. Check that the variable speed fan control is in the
OFF position.
2. Install the heater controls to the dash panel with the
previously used hardware.
3. Connect the cab electrical harness connector to the
controls.
4. Install the control knobs.
5. Install the screws securing the dash panel to the
cab.
6. Connect the battery negative (-) cable to the battery
negative (-) terminal.
7. Turn the ignition key to the ON position and check
the fan speeds. If further repair is needed, refer to
Section 9.6, “Electrical System Schematics And
Diagrams.”
8. Start the machine and allow engine to warm to
operating temperature. Check heat control at
different levels.
9. Close and secure the engine cover.
9.11 SOLENOIDS, SENDERS AND
SENSORS
9.11.1 Intelligent Control Valves (INCOVA)
Solenoids
Note: INCOVA valves include the lift valve, telescope
valve and fork tilt valve.
DO NOT remove the solenoids on the INCOVA valves.
Replace the valve assemblies if found to be defective.
Refer to Section 8.8, “Control Valves,” for valve removal
procedures.
9.11.2 Park Brake Solenoid Valve
a. Park Brake Solenoid Valve 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. Disconnect the wiring connector at the park brake
solenoid lead.
6. Remove the nut on the end of the park brake coil (1).
7. Remove the park brake coil.
8. Remove the park brake solenoid (2). (Remove only if
the electrical coil is found to not be faulty.)
b. Disassembly
DO NOT disassemble the solenoid. The solenoid is not
serviceable. Replace solenoid if found to be defective.
c. Park Brake Solenoid Valve Installation
Note: ALWAYS replace seals, o-rings, gaskets, etc.,
with new parts to help ensure proper sealing and
operation. Lubricate seals and o-rings with clean
hydraulic oil.
1. If necessary, install the park brake solenoid in its
original orientation.
2. Slide the park brake coil over the solenoid. Tighten
the nut to secure the solenoid. DO NOT overtighten.
3. Connect the wiring connector to the park brake coil
lead.
4. Connect the battery negative (-) cable at the battery
negative (-) terminal.
5. Close and secure the engine cover.
9.11.3 Sway Solenoid Valve
a. Sway Solenoid Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
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