Brush and Brush Holder

1. Check brushes for free movement in brush holders. Inspect brushes for excessive wear. Where brush leads are insulated, make sure insulation is not burned or worn.

2. The brushes should be well seated to commutator; that is, contacting commutator over at least 60 percent of brush contact area. If not, fit brushes to commutator with fine sandpaper until desired seating area is obtained. Do only one brush at a time. Clean brushes and commutator with compressed air. Make sure no abrasive particles from sandpaper are embedded in the contact area of brushes.

3. New brushes are not ground to fit the commutator; therefore, they must be seated as described.

4. Mark each brush and brush holder with which it was seated to permit assembly in the same position.