E-3
TROUBLESHOOTING
E-3
MAGNUM™PRO 350 and 550 FUME GUNS
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 yourLocal
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS) POSSIBLE
CAUSE RECOMMENDED
COURSE OF ACTION
Intermittent wire feed when trigger is
pulled.
Poor fume extraction.
Frequent occurrence of contact tip burn-
back.
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 equipment is
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.
1. Remove and then clean or replace
drive roll. (See Maintenance Section)
2. Manually pull wire slowly thru gun until
unkinked wire emerges.
1. Remove the powdered deposits.
2. Block off air drafts.
3. Check for loose hose clamps or
detached hoses.
4. Reroute leads (See Maintenance
Section).
5. Switch on or plug in extraction equip-
ment.
6. See Troubleshooting section in extrac-
torʼs instruction manual.
7. Clean or replace filters per equipment
instructions.
8. Set to high speed.
9. Attempt to straighten out hose or
remove blockage; otherwise replace
hose.
10. Punctures: Patch hose with tape
Tears: Replace hose.
1. See welding wire literature for proper
settings
2. See symptoms on intermittent or slug-
gish wire feed