Lincoln Electric MAGNUM 350 User Manual page 24

E-3
PROBLEMS
(SYMPTOMS)
Intermittent wire feed when trigger is
pulled.
Poor fume extraction.
Frequent occurrence of contact tip burn-
back.
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.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
PROBLEMS
1. Drive roll has become galled.
2. Wire has become kinked along its feed
path.
1. Fume powder deposits are blocking off
gun passages at the fume collection
nozzle or fume tube.
2. Excessive air currents.
3. Gun has excessive air leaks.
4. Trigger and accessory switch leads
are blocking fume air flow.
5. Fume extraction
switched off.
6. Fume extraction equipment is non-
functional.
7. Fume extraction equipment has
blocked filters.
8. Lincoln Miniflex extractor is set to low
speed.
9. Vacuum hose is partially or completely
flattened or blocked.
10. Vacuum hose is punctured or torn.
1. Improper welding parameters or tech-
nique (example: ESO is too short).
2. Wire may be feeding intermittently.
MAGNUM™ PRO 350 and 550 FUME GUNS
CAUSE
1. Remove and then clean or replace
2. Manually pull wire slowly thru gun until
1. Remove the powdered deposits.
2. Block off air drafts.
3. Check for loose hose clamps or
4. Reroute leads (See Maintenance
equipment is
5. Switch on or plug in extraction equip-
6. See Troubleshooting section in extrac-
7. Clean or replace filters per equipment
8. Set to high speed.
9. Attempt to straighten out hose or
10. Punctures: Patch hose with tape
1. See welding wire literature for proper
2. See symptoms on intermittent or slug-
CAUTION
RECOMMENDED
COURSE OF ACTION
drive roll. (See Maintenance Section)
unkinked wire emerges.
detached hoses.
Section).
ment.
torʼs instruction manual.
instructions.
remove blockage; otherwise replace
hose.
Tears: Replace hose.
settings
gish wire feed
E-3