W. Pitted contact surface of brush
  Possible Causes Remedies
1 Overload of machine Reduce and limit load
4 Interpole field too strong Reduce interpole fields
6 Interpole air gap too small Enlarge air gap - decrease effective interpole flux
8 Air gaps uneven (worn bearings) Replace bearings and realign machine
12 Resistance between brush and arm not uniform Clean and tighten connections
14 Mica proud Recess mica or use a more abrasive grade
15 High or low commutator segments Tighten, turn or regrind
19 Flats on commutator or slipring Remove cause while turning or grinding
20 Spring pressure too low Adjust to brush grade
22 Spring pressure unequal Adjust spring pressure uniformly
26 Brush arc of contact excessive Reduce effective thickness of brush
31 Brush sticking Check brush size - remove burns and dust
35 Incorrect position of holder Adjust holder to correct position
36 Unequal alignment of holders Correct spacing and alignment of holders
40 Gas or acid fumes in atmosphere Arrange for clean air cooling

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