JLG G12-55A Service Manual - Manual (Page 160)

Electrical System
9-18 G10-55A, G12-55A
9.9.3 Transmission Temperature Sender
a. Transmission Temperature Sender Removal
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL, engage park brake
and shut engine OFF.
2. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect the batteries.
5. Unplug transmission temperature sender
connector (10) 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 transmission temperature sender into
transmission housing snugly, then connect sender
connector to wiring harness connector.
2. Properly connect the batteries.
3. Check for proper fluid level.
4. Start engine, allow it to reach operating temperature
and observe the operator’s display cluster for
warning indication. If sender is not defective,
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 ignition
key switch and steering wheel.
9.9.4 Engine Coolant Temperature Sender
a. Engine Coolant Temperature Sender Removal
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL, engage park brake
and shut engine OFF.
2. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect the batteries.
5. Unplug the engine coolant temperature sender
connector (1) from the wiring harness connector.
6. Engine coolant temperature sender (2) is located
near upper radiator hose thermostat housing and
threaded into engine block. Remove the sender.
b. Engine Coolant Temperature Sender Inspection
and Replacement
Inspect sender and wiring harness connector terminals
for continuity. Replace a defective or faulty sender with a
new part.
MY4620
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