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TROUBLESHOOTING & REPAIR
F-9 F-9
COMMANDER 300
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.
1. If the battery is replaced or tests
good, then the charging circuit
may be faulty. See the Wiring
Diagram.
2. The starter motor or starter sole-
noid may be faulty.
3. The engine may be hard to
crank due to a mechanical fail-
ure in the engine.
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 Fuel Shut-
down Solenoid Test.
2. The engine protection board
may be faulty. With the
Run/Stop switch in the “Run”
position, the protection board
should normally supply 10VDC
to the shutdown solenoid via
leads #224 and #262. See the
Wiring Diagram.
3. The engine may be in need of
mechanical repair.