CHART OF COMMON DIFFICULTIES SECTION 3
L. Excessive commutator wear - black surface
  Possible Causes Remedies
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
18 Commutator or slipring excentric Turning and grinding at near rated speed
19 Flats on commutator or slipring Remove cause while turning or grinding
20 Spring pressure too low Adjust to brush grade
31 Brush sticking Check brush size - remove burns and dust

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Unit 1, 120 Shad Road,
Wadeville Ext2
Alberton
South Africa

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Alberton
1450 
South Africa

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