TP-5867 11/0242 Section 6 Component Testing and Adjustment
of less than 500 kOhms indicates deterioration
of the winding insulation and possible current
flow to ground.
Leads Continuity
1 and 2 Yes
3 and 4 Yes
33 and 44 Yes
3 and 44 Yes
55 and 3 Yes
55 and 33 Yes
1 and 3, 4, 33, 44, 55 No
Any stator lead and ground on stator
housing or frame laminations
No
Figure 6-12 Continuity Test Results on a Good Stator
6.6 Brushes
The brushes transfer current from the voltage regulator
to the slip rings. The brushes should last the life of the
generator. Abrasive dust on the slip rings, however,
shortens the life of the brushes. Excessive arcing at the
brushes could damage the voltage regulator. Weak
springs, damaged slip rings, sticking brushes, a loose
brush holder, or poor brush contact causes arcing.
The brushes must be free to move within the holder and
be held in contact with the slip rings by the springs.
When correctly positioned, spring pressure on the brush
surface causes the brush to wear evenly. The entire
brush must ride on the ring or arcing occurs and causes
burned rings or voltage regulator failure. Figure 6-13
shows the correct positioning of the brushes. Add or
remove shims as necessary to center the brushes on
the slip rings.
Replace the brushes if they show uneven wear or are
worn to one half their original length.
TP586788
1
2
3
Front View
Side View
1
2
4
New 1.9 cm (0.75 in.)
5
6
7
8
9
10
11
11
4
1. Brush holder
2. Ring collector
3. Brushes
4. Brush
5. Retainer wire
6. Shim
7. Spring
8. Brush holder
9. Correctly positioned brush
10. Incorrectly positioned brush
11. Slip ring
Figure 6-13 Brush Assembly
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