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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 is loud and
spatters excessively.
The weld current or voltage
settings may be incorrect.
The polarity may be incorrect
for the process in use.
If a remote current control is
being used, try switching to
local control. The remote
current control may be faulty.
The engine RPM may be
incorrect; perform the Engine
RPM Adjustment Test.
Check the exciter brushes
and slip rings, and if
necessary, perform the Brush
and Slip Ring Service
Procedure.
Check the DC welding
generator brushes and
commutator. Perform the
Welding Generator Brush
and Commutator Inspection
and Service Procedure.
Replace the Exciter Diode
Bridge with a new or known
good bridge.
(Diode bridges will sometimes
appear good under test, but
fail while under a normal
operating load.)
Perform the Exciter Rotor
Resistance and Ground
Test.
Perform the Shunt Field Coil
Resistance and Ground
Test.
Verify that the rocker is
positioned correctly, according
to the factory drill mark.
Adjust the rocker position per
the procedure in this manual.
TROUBLESHOOTING AND REPAIR
F-9 F-9
CLASSIC® 300D & 300G
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