JLG 723A Service Manual - Manual (Page 145)

9.37 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Electrical System
9.14.6 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. Park the machine on a firm, level surface with the
machine level, retract and level the boom. Place the
transmission control lever in the (N) NEUTRAL
position and engage the parking brake. 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. Allow the engine and all system fluids to cool.
4. Properly disconnect the battery.
5. Disconnect the wiring connector at the fuel shut-off
solenoid lead.
6. 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. Properly connect the battery.
5. Start the engine. If the engine starts, the fuel shutoff
solenoid is functioning. If the engine fails to start, the
fuel shut-off solenoid may have a poor ground
connection. Visually check the wiring at the fuel
shutoff solenoid leads and/or check for continuity
with a voltmeter as required.
6. Check for fuel and/or oil leakage around the solenoid.
7. Close and secure the engine cover.
8. Remove the Do Not Operate Tag from the ignition
key switch and the steering wheel.
9.14.7 Oil Pressure Sender
The oil pressure sender (2) is located on the engine near
the oil filter.
a. Oil Pressure Sender Removal
1. Park the machine on a firm, level surface with the
machine level, retract and level the boom. Place the
transmission control lever in the (N) NEUTRAL
position and engage the parking brake. 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. Allow the engine and all system fluids to cool.
4. Properly disconnect the battery.
5. Disconnect the wiring connector at the oil pressure
sender lead.
6. The oil pressure sender is threaded into the engine.
Remove the sender.
b. Oil Pressure 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. Oil Pressure Sender Installation and Testing
1. Thread the oil pressure sender into the engine
housing snugly, then connect the sender connector
to the wiring harness connector.
2. Properly connect the battery.
3. Check for proper fluid level.
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