Drive motor on Mastercraft MIG welder stopped working.

At this point i would open it up, voltmeter on motor terminals to determine if its motor or source voltage.
My 30 year old clarke gave me trouble, i had welder on bench and piece i was welding touched the welder housing. Blew out the circuit board. Replaced it and never made that same mistake.

all im saying is figure out what is broken and see if you can get parts.