Lincoln Electric IM10168 K3355-,K3356-,K3357-,K3358- MAGNUM PRO AL Push Pull Gun - Manual (Page 16)

E - 2
TROUBLESHOOTING MAGNUM ® PRO AL Gun
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
No wire feed at gun.
115/42 VAC Control fuse in feeder/Control
box blown.
Replace fuse.
Micro-switch defective/not being activated. Replace switch. Check switch for operation.
Broken electrical cable. Check micro switch wires for continuity.
Wire feeds, but welding wire is not
energized.
Loose or no cable connections. Check all power connections.
Welding power source. Check power source.
Wire feeds erratically.
Dirty or worn conduit. Replace conduit.
Wrong size contact tip. See Contact tip table.
Idler roll stuck. Replace if damaged.
Wire feeds one speed only.
Bad potentiometer. Check with meter.
Broken electrical cable.
Check potentiometer wires for continuity or
short.
Bad speed control.
See specific cabinet/control owners manual
for speed control operation.
Wire walks out of drive rolls. Idler roll upside-down. Place groove in idler roll toward top.