Have a lincon 255Xt mig welder. You push the triger and it feed and try to weld and it arces then it stops right a way. Let go of the trigger and push the trigger and it feeds again. What is are problem?

Been welding for a while, open side, check for proper tension on the feed wheel inside side panel, hit the trigger, if feed motor continues to spin tensioner needs tightened or mig wire may be getting hung up inside main cable lead. If motor is off on off on then its probbably the switch on the trigger getting a bad good connection, hope this helps o and check welding tip on gun end, may need replaced if worn or melted, unscrews.

Internal fuse inline with the transformer output to the gun.

check for circuit breaker by drive motor, it may be the pc board.

Your drive tension is too light. There are rollers that the wire feeds through and they need to be tightened. They should push the wire through the gun but slip if you put the tip against a solid object and pull the trigger. If they do not slip, they will jam your gun. Give the tensioner another turn.

try changing the tip and make sure your ground connection is good on the steel and in the machine sometimes the ground wire in the machine comes loose

These welders have thermal breakers in them so if they get to hott the will automatically stop feeding the wire but the fan will remain on, try changing the breaker i think its in the door where the spool is held. good luck]

Look for a reset button on the case. Make sure that you have power to the machine and at the power socket. If everything looks ok outside, you may have to investigate your warranty. Good luck!

Look on the front pannel. thier should be a "latching Switch" indicated by "4 X 2" little arrowes. The 4 is " pull the triger -- the release the arc continues, the "2" is pull the trigger and the arc startes release the trigger the arc stops simplesssssssss
Ken

Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .

either your not grounded on the vehicle very good or you lost the ground either in your gun or on your clamp