R. Commutator has unsymmetrical burn marks
  Possible Causes Remedies
10 Oil or dirt on common commutator or slipring Clean
14 Mica proud Recess mica or use a more abrasive grade
15 High or low commutator segments Tighten, turn or regrind
16 Commutator too loose Tighten, use new mica and turn
17 Solderings interrupted Resolder tags
18 Commutator or slipring excentric Turning and grinding at near rated speed
20 Spring pressure too low Adjust to brush grade
22 Spring pressure unequal Adjust spring pressure uniformly
24 Brush flexible connection faulty Replace by a new brush with good connection
29 Radial brush holders not in correct position Adjust holder to radial position, distance from commutator 2-3mm
30 Reaction type holder mounted trailing Reverse holders or direction of rotation
31 Brush sticking Check brush size - remove burns and dust
34 Brush holder mounted too far from commutator or slipring Adjust holder to be 2mm from commutator
38 Humidity too high Enclose machine or draw cooling air from humidity object
39 Dusty atmosphere Remove cause, install filter

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