Switches, Solenoids And Senders - JLG 3507 Service Manual

9.12 SWITCHES, SOLENOIDS AND
SENDERS
9.12.1 Fuel Shut-off Solenoid
MZ0200
a. Fuel Shut-off Solenoid 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 engine to cool.
4. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
5. Disconnect the wiring connector at the fuel shut-off
solenoid lead.
6. Remove the fuel shut-off solenoid (7) from the fuel
injector pump.
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 injector pump.
2. Install the fuel shut-off solenoid on the fuel injection
pump. Do not over tighten.
3. Connect the wiring connector at the fuel shut-off
solenoid lead.
3507, 3508, 3509, 3512, 3513, 4007, 4008, 4009, 4012, 4013
4. Connect the battery negative (-) cable at the battery
negative (-) terminal.
5. Start the engine. If the engine starts, the fuel shut-off
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
shut-off solenoid leads and/or check for continuity
with a voltmeter as required.
6. Check for fuel and/or oil leakage around the
7
solenoid.
7. Close and secure the engine cover.
9.12.2
a. Main Control Valve Solenoid 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 engine to cool.
4. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
5. Disconnect the wiring connector at the valve
solenoid lead.
6. Loosen and remove the four allenhead mounting
screws.
7. Remove the valve solenoid (8) being careful not to
lose or damage any o-rings. Note the location of any
orifices, check valves and o-rings if equipped.
b. DO NOT disassemble a valve solenoid. Replace a
defective valve solenoid with a new solenoid.
Electrical System
Main Control Valve Solenoids
MZ0450
8
9.27
Courtesy of Crane.Market