[Rich Biebel]

Check the brushes first. They wear and can damage the surfaces they make contact on. Slip rings is the name for them. If the brushes are bad and the slip rings need cleaning, a piece of emery or sand paper taped to a paint stir stick cut lengthwise to fit in there works best. Start machine and hold button down or put the machine into ERO mode if it has that option. Engine Run Only mode. Brushes can wear out in 700-1200 hours and occasionally much sooner.