Lincoln Electric IM586 STT-10 Head & Controls - Manual (Page 33)

E-2 TROUBLESHOOTING E-2
STT-10
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 your
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Rough wire feeding or wire not feed-
ing, but drive rolls are turning.
Variable or "hunting" arc.
Poor arc striking with sticking or
"blast-offs", weld porosity, narrow
and ropy looking bead, or electrode
stubbing into the plate while welding.
Tip seizes in the diffuser.
1. Gun cable kinked and/or twisted.
2. Wire jammed in gun and cable.
3. Check for current position of drive
rolls relative to split wire guide
groove.
4. Drive rolls may not be seated
properly.
5. Gun cable dirty.
6. Worn drive roll.
7. Worn nozzle or cable liner.
8. Partially flashed or melted contact
tip.
9. Incorrect drive roll pressure.
10. Improper liner, contact tip, or
inner/outer wire guides.
11. Incorrect wire drive or gear ratio
selection on the control p.c.
board.
1. Wrong size, worn and/or melted
contact tip.
2. Worn work cable or poor work
connection.
3. Loose electrode or work cable
connections.
4. Wrong polarity.
5. Gas nozzle extended beyond gun
tip or wire stickout too long while
welding.
6. Poor gas shielding on processes
requiring gas.
1. Improper procedures or tech-
niques.
2. Improper gas shielding.
1. Tip overheating because of pro-
longed or excessive high current
and/or duty cycle welding.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.