Lincoln Electric Magnum K115-1 Operator's Manual page 20

INNERSHIELD PRO & MAGNUM CLASSIC GUN
PROBLEMS
(SYMPTOMS)
Intermittent wire feed when trigger is pulled.
Frequent birdnesting or kinking of wire in the
gun cable.
Frequent occurrence of contact tip burnback.
Poor weld bead appearance.
Wire feeder runs or begins feeding wire
without pulling the gun trigger.
If for any reason you do not understand the procedures or are unable to perform the maintenance or repairs safely, contact your
Lincoln Authorized Service Facility for technical troubleshooting assistance before you proceed.
WWW.LINCOLNELECTRIC.COM/LOCATOR
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
CAUSE
1. Drive roll has become galled.
2. Wire has become kinked along its feed
path.
1. Wire shavings/lubricant is building up in
the cable.
2. Cable liner is too large for wire size.
3. Mechanical resistance to wire feeding is
too large.
1. Improper welding parameters or
technique (example: ESO is too short).
2. Wire may be feeding intermittently.
1. Improper electrode polarity.
2. Improper welding parameters or
technique.
1. Defective trigger (contacts closed or dirty). 1. Replace trigger assembly.
2. Defective (closed) trigger circuit in the
welding machine.
3. Trigger lead(s) inside gun cable are
shorted together or commonly shorted to
either welding or accessory switch
circuits.
E-3
TROUBLESHOOTING
RECOMMENDED
COURSE OF ACTION
1. Remove and then clean or replace drive
roll.
2. Manually pull wire slowly thru gun until
unkinked wire emerges.
1. Clean cable or replace cable liner.
2. Install the smallest possible liner which is
specified for the wire being used (i.e. use
a .052-1/16 liner instead of a 1/16-5/64
liner when welding with 1/16" diameter
wire.
3. If using a reverse bend gun tube, try
welding with a non reverse bend product.
1. See welding wire literature for proper
settings.
2. See symptoms on intermittent or sluggish
wire feed.
1. Reconnect machine's welding output to
proper electrode polarity.
2. See welding wire literature for proper
settings.
2. See machine's instruction manual.
3. Damaged control leads along cable; repair
if possible. Otherwise, replace gun cable.