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WELDING PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
CAUTION
The welding arc frequently “pops
out”. Welding heat seems
normal and auxiliary output
voltage appears normal.
The fine current control
rheostat may be set too low.
Try increasing the fine current
control setting. Drop the range
selector to a lower setting if
arc is too hot.
If a remote control is being
used, try switching to local
control. The remote control
unit may be faulty.
Check welding cables for
damaged or poor connections.
Welding cable may be
excessively long, too small, or
coiled. Try using a set of short
test cables of adequate size.
The engine RPM may be
incorrect; perform the Engine
RPM Adjustment Test.
Check the exciter brushes
and slip rings. If necessary,
perform the Brush and Slip
Ring Service Procedure.
Check the DC welding
generator brushes and
commutator. If necessary,
perform the Welding
Generator Brush and
Commutator Inspection and
Service procedure.
Perform the Flash Voltage
test.
Perform the Shunt Field
Circuit Voltage Test.
Check that the rocker is
aligned to the factory drill
mark, and perform the
Rocker Adjustment
Procedure if necessary.
TROUBLESHOOTING AND REPAIR
F-10 F-10
CLASSIC® 300D & 300G
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