CHART OF COMMON DIFFICULTIES SECTION 2
H. Rapid brush wear while commutation good
  POSSIBLE CAUSES REMEDIES
2 Vibration from external causes, i.e. forge hammer Remove causes - mount machine on shock absorbers
3 Vibration from internal causes, i.e. out of balance Balance armature and check for bearing wear
10 Oil or dirt on common commutator or slipring Clean
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
25 Brush flexible too short or too stiff Use brush with flexible of correct length and flexibility
28 Sparking Check pressure, grade, holders, brush alignment, remove burns
31 Brush sticking Check brush size - remove burns and dust
37 Humidity too low Humidify air  possibly change brush grade
39 Dusty atmosphere Remove cause, install filter
40 Gas or acid fumes in atmosphere Arrange for clean air cooling

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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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