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F-10 TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
PROBLEMS
(SYMPTOMS)
Wire feeding rough or not feeding,
but drive rolls turning.
Variable or “hunting” arc.
Weld bead is narrow or ropey. May
have porosity with electrode
stubbing into plate.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Check for kinked or twisted gun
cable.
2. Check for jammed wire in gun
or cable.
3. Check for worn nozzle or
flashed or melted contact tip.
1. Check for worn or melted
contact tip.
2. Inspect for worn work cable,
poor work connection, or loose
electrodes.
3. Is electrode polarity correct?
4. Check for rusty electrode wire.
5. Check power source for proper
operation.
1. Make sure the weld procedure
and electrode polarity is correct
for the process being used.
2. Make sure shielding gas is
correct and flow is proper.
3. Make sure the weld joint is not
“contaminated”.
RECOMMENDED
COURSE OF ACTION
1. Check for correct size and
installation of drive rolls and
guide tubes. Refer to the
Operation Section - Drive Roll
Installation for correct drive roll
and guide tube installation.
2. Check idle roll pressure, brake
tension, and drive roll
cleanliness. Set drive roll
tension per Operation Section -
Idle Roll Pressure Setting.
Possible problem with the weld
procedure. Contact Lincoln Electric
at 216-383-2531 or 1-800-833-
9353.
The welding power source may be
faulty. Check or replace.
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 216-383-2531 or 1-800-833-9353.
WIRE FEEDING AND WELDING PROBLEMS
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components. See Wiring Diagrams for troubleshooting of specific circuits.