JLG G12-55A Service Manual - Manual (Page 176)

Electrical System
9-34 G10-55A, G12-55A
9.10.6 Air Manifold Temperature Sensor -
John Deere
a. Air Manifold Temperature Sensor 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. Unplug the engine coolant temperature sender/
switch connector from the wiring harness connector.
6. Unplug the air manifold temperature sensor
connector from the wiring harness connector.
7. The air manifold temperature sensor (3) is threaded
into the engine block. Remove the sender.
b. Air Manifold Temperature Sensor Inspection and
Replacement
Inspect the sensor and the wiring harness connector
terminals for continuity. Replace a defective or faulty
sensor with a new part.
c. Air Manifold Temperature Sensor Installation and
Testing
1. Thread the air manifold temperature sensor into the
air manifold snugly, then connect the sensor connector
to the wiring harness connector.
2. Properly connect the battery.
3. Check for proper coolant level.
4. Start the engine, allow it to reach operating
temperature and observe the operator’s instrument
cluster for warning indication. If the sensor 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 engine cover.
6. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
9.10.7 Engine Oil Pressure Sender/Switch
a. Engine Oil Pressure Sender/Switch 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. Unplug the engine oil pressure sender connector
from the wiring harness connector.
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