JLG G12-55A AccuPlace Service Manual - Manual (Page 146)

Electrical System
9.28 G10-55A & G12-55A AccuPlace
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 two wiring connectors at the sway
solenoid leads.
6. Remove the nut on the end of the sway coil (3).
7. Remove the sway coil.
8. Remove the sway solenoid (4). (Remove only if the
electrical coil is found to not be faulty; cold
resistance approximately 6 ohm.)
b. Disassembly
DO NOT disassemble the solenoid. The solenoid is not
serviceable. Replace solenoid if found to be defective.
c. Sway 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 sway solenoid in its original
orientation.
2. Slide the sway coil over the solenoid. Tighten the nut
to secure the solenoid. DO NOT overtighten.
3. Connect the two wiring connectors to the sway coil
leads.
4. Connect the battery negative (-) cable at the battery
negative (-) terminal.
5. Close and secure the engine cover.
9.11.4 Pump Solenoid Valve
a. Pump 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 pump
solenoid lead.
6. Remove the nut on the end of the pump coil (5).
7. Remove the pump coil.
8. Remove the pump solenoid (6). (Remove only if the
electrical coil is found to not be faulty; cold
resistance approximately 3.7 ohm.)
b. Disassembly
DO NOT disassemble the solenoid. The solenoid is not
serviceable. Replace solenoid if found to be defective.
MAP04101
3
4
MAP04101
5
6