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E-2
TROUBLESHOOTING
CLASSIC 300G
E-2
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSES
RECOMMENDED
COURSE OF ACTION
Machine fails to hold the heat con-
stantly.
Welder starts but fails to generate
current.
Welding arc is loud and spatters
excessively.
1. Rough or dirty commutator.
2. Brushes may be worn down to
limit.
3. Field circuit may have variable
resistance connection or intermit-
tent open circuit due to loose, or
broken wire.
4. Electrode lead or work lead con-
nection may be poor.
5. Wrong grade of brushes may
have been installed on generator.
6. Field rheostat may be making
poor contact and overheating.
1. Generator or exciter brushes may
be loose or missing.
2. Exciter may not be operating.
3. Field circuit of generator or
exciter may be open.
4. Exciter may have lost excitation.
5. Series field and armature circuit
may be open-circuited.
1. Current setting may be too high.
2. Polarity may be wrong.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.