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F-12 F-12
RANGER 10-LX
TROUBLESHOOTING & REPAIR
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, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
ENGINE PROBLEMS
The engine will not go to high idle
when attempting to weld or when
the auxiliary power is loaded.
Welding output and auxiliary power
output are normal when idler
switch is in the “HIGH” position.
1. Make sure the welding cables
and auxiliary power lead con-
nections are tight.
2. Automatic idler may not func-
tion if the auxiliary power is
loaded to less than 150 watts.
3. If using the 115/230 volt recep-
tacle for 115 volts, try using the
“other side” of the receptacle.
The internal load sensing is only
on one side of the receptacle.
1. Check for broken or faulty con-
nections in the sensing leads
(#254, 254A and lead #3).
Make sure lead #3 is looped
through the current sensor on
the control board.
2. The control board may be
faulty. Replace.
The engine will not crank or cranks
very slowly.
1. Check for loose or faulty battery
cable connections.
2. The battery may be faulty.
1. If the battery is replaced or tests
good, then the charging circuit
may be faulty. Perform the
Charging Circuit Test.
2. The starter motor or starter
solenoid may be faulty.
3. The engine may be hard to
crank due to a mechanical fail-
ure in the engine.