TM 5-3895-373-34
C.
INSPECT - Continued.
5.
INSPECT COLLECTOR RINGS AND ROTOR FOR
WEAR AND OUT-OF-ROUNDNESS.
a. Use an outside micrometer to measure outer
diameter surface A of collector rings.
b.
If outer diameter of collector rings is less than
1.055 in. (26, 8 mm), replace collector rings per
step D.
c.
Place ends of rotor shaft on V-blocks and align
exactly horizontal.
d.
Turn rotor on V-blocks and measure amount
of running error on collector rings and rotor using
a dial indicator.
e.
If maximum amount of running error on collector
ring surface A is 0.001 in. (0, 03 mm), replace
collector rings per step D.
f.
If maximum amount of running error on rotor
surface R B is 0.019 in. (0, 5 mm), replace
rotor.
6.
INSPECT TRANSISTOR CARBON BRUSH
ASSEMBLY (6) FOR WEAR.
a.
Use a steel machinist’s rule to measure brush
projection length on surface C.
b.
If brush projection length is less than 0.19 in. (5
mm), replace transistor.
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