Runs for a few minutes then stops
ok, the machine will run in a working situation for 2 minutes then motor keeps running but vibration stops. The arm that causes the vibrations can be rotated about a half turn and the machine works again for 2 minutes, then stops vibrating again. I'm not going in until I have a plan. I'm thinking the serpentine belt is shot or the pulley it wraps around has worn smooth. Is this common?