JLG 4017RS Service Manual - Manual (Page 165)

9-13 3614RS, 4017RS
Electrical System
9.6 ENGINE START CIRCUIT
9.6.1 Starter
a. Testing Starter on Engine
If starter (1) does not engage when ignition key switch is
turned, check following:
1. Main fuse may be blown, requiring replacement. Check
for cause of blown fuse.
2. There may be a defect in ignition key switch, ignition
wiring or starter solenoid.
3. Check battery condition. Clean battery posts and
connectors at each end of battery cables.
4. Check for broken wiring and damaged insulation on
wiring. Replace all broken or damaged wiring.
5. Check all connections at starter solenoid, key
switch and wiring harness plugs. Clean and tighten all
connections.
6. If starter still does not operate after these checks have
been performed, check starting circuit.
b. Starter Circuit Checks
1. Check wires and connections for looseness, corrosion,
damage, etc.
2. If a “whirring” noise is heard but engine does not turn
over, starter is spinning but not engaging flywheel. The
starter drive or solenoid that pushes drive forward to
engage flywheel may be defective. Missing or damaged
teeth on flywheel can also prevent starter from cranking
engine.
3. If starter only “clicks” it may indicate that battery is
discharged, or that there is a loose or corroded battery
cable connection. Check battery state of charge and
battery condition first, then check cables and cable
connections.
4. For additional information on starting circuit, refer to
Section 9.5, “Electrical System Schematics.”
c. Starter Removal
Remove starter only if it fails. To remove starter:
1. Park machine on a firm, level surface, level machine, fully
retract boom, lower boom, place transmission in the (N)
NEUTRAL, engage parking brake, and shut engine OFF.
2. Place a Do Not Operate Tag on both ignition key switch
and steering wheel.
3. Open engine cover. Allow system fluids to cool.
4. Properly disconnect battery.
5. Remove belly pan (2).
6. Remove wires from solenoid stud. Remove positive (+)
battery cable from starter. Label and disconnect wire
from starter solenoid housing stud. Record how wires
are installed to ensure correct installation later.
7. Loosen but DO NOT remove hardware securing starter.
Support starter securely as it is relatively heavy and will
fall if not supported.
8. Support starter and remove fasteners securing starter.
Remove negative (-) ground cable from its starter
mounting bolt.
9. Remove starter from machine.
d. Starter Installation
1. Position starter in its mounting opening on flywheel
housing. Position negative (-) ground cable over correct
starter mounting bolt. Secure starter with previously
used hardware.
2. Connect positive (+) battery cable to solenoid stud.
Install wires to solenoid stud, and secure with lock
washer and nut.
3. Connect battery negative (-) cable to battery negative (-)
terminal.
4. Close and secure engine cover.
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