Lincoln Electric GMA WIRE FEEDERS LN-7 Operator's Manual page 53

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PROBLEMS
(SYMPTOMS)
Rough wire feeding or wire not feed-
ing but drive rolls are turning.
Variable or hunting arc.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Authorized
Field Service Facility.
TROUBLESHOOTING & REPAIR
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
PROBLEMS
1. Gun cable kinked and/or twisted.
2. Wire jammed in gun and cable.
3. Incorrect size or installation of
drive rolls and guide tubes.
4. Drive roll loose.
5. Gun cable dirty.
6. Worn drive rolls.
7. Electrode rusty and/or dirty.
8. Worn nozzle or cable liner.
9. Partially flashed or melted contact
tip.
10. Incorrect idle roll pressure.
11. Wire reel brake tension set too
high.
1. Worn and/or melted contact tip.
2. Worn work cable or poor work
connection.
3. Loose electrode connections.
4. Wrong polarity.
LN-7 & LN-7 GMA
CAUSE
1. Inspect gun cable and replace if
2. Remove wire from gun and cable -
3. Refer to Operation Section for
4. Remove, clean, install and tighten.
5. Clean cable or replace liner.
6. Replace.
7. Replace.
8. Replace.
9. Replace contact tip.
10. Set idle roll pressure see
11. Tension should be just high
1. Replace tip - remove any spatter
2. Inspect - repair or replace as nec-
3 Be sure electrode lead is tight, gun
4. Check connection at output studs
CAUTION
RECOMMENDED
COURSE OF ACTION
necessary.
feed in new wire. Note any
obstructions in gun and cable.
Replace gun and cable if neces-
sary.
proper installation of drive rolls
and guide tubes.
Operation Section of manual.
enough to prevent overrun.
on end of tip
essary.
cable tight in wire feeder contact
block, gun nozzle and gun tip tight.
for polarity required by welding
process.
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