I have a new Lincoln SP-135T that does not want to feed wire anymore.
Today I loaded the supplied spool of wire (Lincoln L-56, .025), feed the wire till it came out of the gun, installed the tip (.025) and nozzle then connected the shield gas setup. Everything was going great until I started welding. After about an inch bead the wire stopped feeding. I was just putting down a bead on some flat steel stock. The wire was still poking out of the tip about 1/8 inch. I opened the side panel not knowing what to expect but nothing looked out of place. I pulled the trigger a couple of times and the feed roll moved very little, I tried this over the entire range of feed speeds and the feed roll never moved more that a degree or two. I released the spring loaded pressure arm and was able to push the wire by hand through the gun with minimal force. Note that there is almost no pressure on the wire spool, I'll tighten this up a bit when I get the feed issue taken care of. I also checked to make sure I was using the proper groove in the feed roll.
With no pressure on the drive roll I pulled the trigger and the drive roll rotated in jerks. What's up with that? After alot of looking around I decided to remove the drive roll. With the drive roll removed I pulled the trigger and the drive roll shaft rotated like a champ. I tried this at different speeds and the drive motor seems to work. I reinstalled the drive roll and were back to jerky rotation. After looking around some more I slipped some paper between the drive roll and the wire , note this is with no pressure on the drive roll, and the drive roll rotates just fine. It seems that the drive motor will not work if the wire is touching the drive roll.
I'm out of ideas on this one. Any thoughts on this issue problem would be appreciated.