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TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
ENGINE PROBLEMS
The engine will not crank when the
start button is pushed.
1. Check for loose or faulty battery
cable connections.
2. The battery may be low or faulty.
3. The START button may be
faulty.
1. The starter motor or starter
solenoid may be faulty.
2. The engine may be hard to
crank due to a mechanical fail-
ure in the engine.
3. See the Engine Starting Diag-
nostic Chart.
The engine cranks but will not start. 1. Check for adequate fuel supply.
2. Make sure the fuel shut off valve
is in the open position.
3. The engine oil temperature may
be too high. Check cooling sys-
tem.
4. The battery voltage may be too
low.
1. The shutdown solenoid may be
faulty. Perform the Shutdown
Solenoid Test.
2. The Peripheral PC board may
be faulty. With the RUN/STOP
switch in the "RUN" position, the
Peripheral PC board should nor-
mally supply 10VDC to the shut-
down solenoid via leads #224
and #262. See the Wiring
Diagram.
3. The Pull Coil PC board may be
faulty.
4. The engine may be in need of
mechanical repair.
5. See the Engine Starting Diag-
snostic Chart.
F-9 F-9
TROUBLESHOOTING & REPAIR
COMMANDER 500
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