JLG G5-18A Service Manual - Manual (Page 123)

9.23 G5-18A/2505
Electrical System
If trouble is suspected, time the hourmeter for six minutes
to verify that a tenth of an hour has been recorded.
The hourmeter is built into the instrument cluster and
cannot be repaired. If the hourmeter is suspect, replace
the instrument cluster.
9.11.5 Coolant Temperature Sender
The coolant temperature sender (2) is located on the top
of the engine below the top radiator hose.
a. Coolant Temperature Sender Removal
1. Open the battery and engine covers. Allow the
engine to cool.
2. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
3. Disconnect the wiring connector at the coolant
temperature sender lead.
4. The coolant temperature sender is threaded into the
engine block. Remove the sender.
b. Coolant 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. Coolant Temperature Sender Installation and
Testing
1. Thread the coolant temperature sender into the
engine housing snugly, then connect the sender
connector to the wiring harness connector.
2. Connect the battery negative (-) cable to the battery
negative (-) terminal.
3. Check for proper fluid level.
4. Start the engine, allow it to reach operating
temperature and observe the operator’s instrument
cluster for warning indication. If the sender is not
defective, the problem could be elsewhere; possibly
in a shorted wire, improper-running engine, improper
or low coolant, obstructed or faulty radiator, coolant
pump, loose fan belt, defective instrument display,
etc.
5. Close and secure the battery and engine covers.
9.11.6 Fuel Shut-off Solenoid
The fuel shut-off solenoid (1) is located on the top of the
engine injector pump.
a. Fuel Shut-off Solenoid Removal
1. Open the battery and engine covers. Allow engine to
cool.
2. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
3. Disconnect the wiring connector at the fuel shut-off
solenoid lead.
4. Remove the fuel shut-off solenoid from the engine.
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 solenoid.
d. Fuel Shut-off Solenoid Installation
1. Clean the exterior of the fuel shut-off solenoid
engine location.
2. Install the fuel shut-off solenoid on the engine. Do
Not Over Tighten.
3. Connect the wiring connector at the fuel shut-off
solenoid lead.
4. Connect the battery negative (-) cable to the battery
negative (-) terminal.
MY1890
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