Tweco FP-260 - Manual (Page 18)

TROUBLESHOOTING GUIDE FOR FP-300 MIG GUN
FP-300 WIRE CONDUIT REPLACEMENT
To remove the conduit:
1. Lay the MIG-Gun out on a table or on the floor in a straight line. Make sure the gun is fully extended and
all twists in the cable are removed.
2. Remove the nozzle and loosen the conduit set screw in the handle of the gun. Remove the conduit retaining
cap at the rear of the gun.
3. Remove the diffuser and contact tip.
4. Grip the conduit stop and remove the conduit from the rear with a twisting motion.
To install the conduit:
1. Uncoil the conduit and lay it in a straight line. Insert the conduit into the rear connector plug. Push the con-
duit into the gun with short strokes. If the conduit hangs up, twist the conduit counterclockwise or gently
whip the cable while applying pressure to the conduit.
2. When the conduit is completely in the gun, reinstall the conduit retaining cap on the rear connector and
tighten the conduit set screw in the handle of the gun.
3. Trim the conduit extending from the conductor tube 13/15”/20.6mm from the end of the conductor tube.
4. File the cut conduit end to remove burrs that could interfere with wire feeding or catch on the diffuser.
5. Replace the diffuser and contact tip. Install and tighten the nozzle.
6. The MIG-Gun is now ready to be reinstalled on the feeder.
16
P ROBLEM
1. Wire feed inconsistent or not smooth.
2. MIG-Gun is running hot.
3. Porous Weld
P OSSIBLE C AUSE
Loose contact tip or diffuser.
Excessively worn contact tip. Spatter
buildup on end of contact tip.
Sharp bends or kinks in conduit.
Dirty or plugged conduit.
Conduit pulled back from diffuser.
Machine improperly adjusted.
Loose contact tip or diffuser.
Loose power connections.
Loose or under size ground cable or
ground clamp.
Operating gun above recommended
amperage rating.
Poor or improper gas flow.
Dirty or contaminated wire.
Base metal contaminated.
R EMEDY
Tighten contact tip and diffuser plier-
tight.
Replace contact tip.
Clean or replace contact tip.
Straighten or replace conduit.
Replace conduit.
Reposition conduit and tighten front set
screw.
Reset machine as per machine and wire
manufacturers’ recommendations.
Tighten contact tip and diffuser plier-
tight.
Inspect complete gun for loose connec-
tions and repair.
Tighten or replace as required.
Re-adjust machine to correct setting for
size of gun being used.
Check gas flow out of gun nozzle. Check
for leaks or restrictions in gas hoses and
connections.
Change wire.
Replace base metal.