I.  Unequal brush wear
1 Overload of machine Reduce and limit load
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
8 Air gaps uneven (worn bearings) Replace bearings and realign machine
10 Oil or dirt on common commutator or slipring Clean
11 Grains of abrasive in the brush contact face Rebed and clean brush face
12 Resistance between brush and arm not uniform Clean and tighten connections
20 Spring pressure too low Adjust to brush grade
22 Spring pressure unequal Adjust spring pressure uniformly
23 Imperfect brush bedding Rebed brushes carefully and clean
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
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
32 Worn brush holder Replace holder
33 Terminal connections loose or dirty Clean, tighten screws
34 Brush holder mounted too far from commutator or slipring Adjust holder to be 2mm from commutator
35 Incorrect position of holder Adjust holder to correct position

Where we Are

Unit 1, 120 Shad Road,
Wadeville Ext2
South Africa

Mail Us

P.O. Box 673
South Africa

Contact Us

Tel: +27 11 824-1168
Fax: +27 11 824-1356

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