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PROBLEMS
(SYMPTOMS)
Drive rolls turn, but wire will not
feed or wire feeding is rough.
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 Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MAGNUM® PRO 350, 450 AND 550 DUAL PROCEDURE & DUAL SCHEDULE
TROUBLESHOOTING
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 drive rolls and guide
tubes.
4. Gun cable liner dirty.
5. Worn drive rolls.
6. Electrode rusty and/or dirty.
7. Worn or improper size cable liner.
8. Partially flashed, melted or
improper size contact tip.
1. Contact tip worn or incorrect size.
2. Worn or undersize work cables or
poor ground connections.
3. Loose electrode connections.
CAUSE
1. Keep as straight as possible.
2. Remove wire from gun and cable
3. Be sure the wire diameter being
4. Clean liner or replace.
5. Replace or reverse split drive roll
6. Replace the electrode if it is rusty.
7. Replace cable liner.
8. Replace the contact tip.
1. Replace contact tip.
2. Inspect – repair or replace as
3. Be sure the following connections
CAUTION
RECOMMENDED
COURSE OF ACTION
Inspect cable and replace if nec-
essary.
– feed in new wire. Note any
obstruction. Replace liner if
necessary.
used is stamped on drive rolls
and guide tubes. Replace if nec-
essary.
type.
necessary.
are tight: electrode cable to wire
feeder and power source, work
cable to power source and work,
gun cable to wire feeder contact
block, gun nozzle to body and
contact tip to nozzle.
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