JLG G12-55A Service Manual - Manual (Page 174)

Electrical System
9-32 G10-55A, G12-55A
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. Properly connect the battery.
5. Close and secure the engine cover.
6. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
9.10.3 Transmission Solenoid Valves
Note: If the transmission is not shifting properly, the
transmission shift control switch (travel select lever),
wiring harness or transmission shift solenoids (9) should
be checked in order to determine which component is
defective. Specific information to determine which travel
position and corresponding component is not responding
can be found in the detailed transmission service
instructions (covering repair, disassembly, reassembly
and adjustment information) are provided in the ZF
Powershift Transmission 4WG-92/98 TSC Repair
Manual, (JLG P/N 31200241) and can be obtained by
calling your local JLG dealer or ZF Service Center.
The transmission should be checked, serviced and
repaired only by experienced service technicians who are
aware of all safety instructions and particular component
features.
Note: Contact the JLG Service Department if internal
transmission repair is required during the warranty
period.
9.10.4 Transmission Temperature Sender
a. Transmission Temperature Sender Removal
The transmission temperature sender (10) is located at
the bottom left side of the transmission housing.
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. Unplug the transmission temperature sender
connector from the wiring harness connector.
6. The sender is threaded into the transmission
housing. Remove the sender.
b. Transmission Temperature Sender Inspection and
Replacement
Inspect the sender and the wiring harness connector
terminals for continuity. Replace a defective or faulty
sender with a new part.
c. Transmission Temperature Sender Installation and
Testing
1. Thread the transmission temperature sender into the
transmission housing snugly, then connect the sender
connector to the wiring harness connector.
2. Properly connect the battery.
3. Check for proper fluid level.
4. Start the engine, allow it to reach operating
temperature and observe the operator’s display
cluster for warning indication. If the sender is not
defective, the problem could be elsewhere; possibly
in a shorted wire, damaged transmission, improper
or low fluid, etc.
5. Close and secure the engine cover.
6. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
9.10.5 Engine Coolant Temperature
Sender
a. Engine Coolant Temperature Sender 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.
MY4330
9 (Y4)
9 (Y5)
9 (Y1)
9 (Y2)
10