SECTION 55 - ELECTRICAL SYSTEM
55-152
Brushes
Clean brushes and adjacent parts, removing carbon
particles by wiping with a clean cloth.
Check each brush for wear. Replace brushes if they
are worn to the service limit.
The positive brushes are welded to the field
windings. If the positive brushes must be replaced, it
will be necessary to replace the motor housing.
The negative brushes are welded to the brush plate.
If the negative brushes must be replaced, it will be
necessary to replace the brush holder assembly.
Standard Length
Service Limit
15 mm
(0.59″)
9 mm
(0.35″)
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Move each brush in the holder to be sure that it is
capable of sliding smoothly.
Check brush spring tension. Replace the brush
holder assembly if the tension is not within specified
limits.
Standard Tension
Service Limit
2.7 - 3.6 kg
(5.9 - 7.8 lbs)
2.2 kg
(4.7 lbs)
5.9 lbs.
7.8 lbs.
223
Check the brush holder assembly for short to ground.
Touch one probe of a continuity tester to the plate and
the other to each of the insulated holders. Replace
the brush holder assembly if any continuity is noted.
224
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