JLG 4017 Service Manual - Manual (Page 140)

Electrical System
9.20 4017
1. Open engine cover. Allow engine to cool.
2. Disconnect the negative (-) battery cable at the
negative (-) battery terminal.
3. Remove the four screws from the cab heater and fan
control panel.
4. Pull the control panel out from the dash panel and
disconnect the variable speed fan control cab
harness connector and disconnect the temperature
cable.
5. Remove the control from the panel.
b. Disassembly
DO NOT disassemble the cab heater and fan controls.
The controls are not serviceable. Replace controls if
found to be defective.
c. Installation and Testing
1. Check that the variable speed fan control is in the
OFF position.
2. Install the temperature control cable to the back of
the control.
3. Install the hex locknut on the shaft and tighten.
4. Connect the cab harness connector to the variable
speed fan control.
5. Install the screws securing the control panel to the
dash panel.
6. Connect the negative (-) battery cable to the negative
(-) battery terminal.
7. Turn the ignition key to the ON position and check
the fan speeds. If further repair is needed, refer to
Section 9.5, “Electrical System Schematics.”
8. Start the machine and allow engine to warm to
operating temperature. Check heat control at
different levels.
9. Close and secure engine cover.
9.11 SOLENOIDS AND SENDERS
9.11.1 Fuel Shut-off Solenoid
a. Fuel Shut-off Solenoid Removal
1. Open engine cover. Allow engine to cool.
2. Disconnect the negative (-) battery cable at the
negative (-) battery terminal.
3. Disconnect the wiring connector at the fuel shut-off
solenoid lead.
4. Remove the fuel shut-off solenoid (1) 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.
4. Connect the negative (-) battery cable to the negative
(-) battery 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 run 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 solenoid.
7. Close and secure engine cover.
MZ0200
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