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You need to look at the wiring diagram to see what parts could be causing the problem. I had a 120 that did the same thing and it was the bridge rectifier that was bad. I unhooked my motor and hooked it to my battery charger to see if it was good.Hope this helps. I will see if I can find a diagram to look at and check back later to see if you have fixed the problem.
I have a 120 and when that happened to it the bridge rectifier was bad on it. Not sure if your 140 has that or not but just something to look into. It only cost me about 8 or 10 bucks to fix mine.
sounds like the bridge rectifier is bad.to test the motor unplug the motor from unit connect 110 volts to the motor itself and see if the motor runs.easiest way to test motor
I have welded countless hours with Linde & Lincoln & even a few Hobarts & the only time that I ever had the same problem was when the ground connection either to the object I was welding, or the welding cable ground wasn't good & clean & tight. Same on stick welders also. I did develop the habit of grinding not only where I was preparing to weld, but where I was placing my ground clamp & that always provided a better "frying bacon" sound as I went along the business of pushing a bead. In a welder, the only other thing than that is involved is the step-up transformer and your wire. Hope this helps.
Take the drive motor off and blow out dust, chips, wire pieces, etc. and then rinse out with contact cleaner, blow dry, re-install. Had to do this every so often with mine. Hope that helps.
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