We have a Lincoln wire-matic 255 mig welder. Lately it has developed a problem, as follows: when the operator presses a trigger, it starts feeding the wire way too slowly, for about a second, then it instantly increases the speed to the proper speed and stays at that speed.
This happens every time and is very consistent. The proper speed should be attained right away instead of a delay.
I tested the motor alone, it runs fine.
Any idea what may be wrong with it. I have my own ideas, but I do not want to share them so as not to pre-judge anyone.