JLG G12-55A Service Manual - Manual (Page 173)

9-31 G10-55A, G12-55A
Electrical System
5. Disconnect the wiring connector at the fuel shut-off
solenoid (6) lead.
6. Remove the fuel shut-off solenoid from the fuel
injector pump.
b. Fuel Shut-off Solenoid Disassembly
DO NOT disassemble a fuel shut-off solenoid. Replace a
defective fuel shut-off solenoid with a new part.
c. Fuel Shut-off Solenoid Inspection and
Replacement
Use a 12-volt DC source and ground to test the solenoid.
Energize the solenoid, and watch for the plunger to
retract. If the plunger does not retract, replace the fuel
shut-off solenoid with a new part.
d. Fuel Shut-off Solenoid Installation
1. Clean the exterior of the fuel injector pump.
2. Install the fuel shut-off solenoid on the fuel injection
pump. Do Not Over Tighten.
3. Connect the wiring connector at the fuel shut-off
solenoid lead.
4. Properly connect the battery.
5. Start the engine. If the engine starts, the fuel shutoff
solenoid is functioning. If the engine fails to start, the
fuel shut-off run solenoid may have a poor ground
connection. Visually check the wiring at the fuel
shutoff solenoid leads and/or check for continuity
with a voltmeter as required.
6. Check for fuel and/or oil leakage around the solenoid.
7. Close and secure the engine cover.
8. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
9.10.2 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. Properly disconnect the battery.
5. Disconnect the wiring connector at the park brake
solenoid lead.
6. Remove the nut on the end of the park brake coil (7).
7. Remove the park brake coil.
8. Remove the park brake solenoid (8). (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.
MY1030
6
MY1140
7
8