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 (3) Smooth minor rough spots, scratches,
for shorts or grounds with an ohmmeter.
and nicks from inside bore of sleeve
b e a r i n g using a fine stone or crocus
ings are defective.
cloth dipped in dry cleaning solvent.
(2) I n s p e c t contact assembly for cracks,
b . Repair of Commutator End Plate.
w a r p a g e , or broken springs. Replace
contact assembly if defective. Inspect
(1) S m o o t h minor scratches, burs, and
contacts on terminal studs for burning
dents on machined surfaces of end plate
or pitting. Replace studs if contacts are
using a fine mill file.
defective.
(2) Repair damaged threads of end plate.
i. Inspection
of
Frame
Assembly.
(3) Smooth minor rough spots, score marks,
(1) Inspect frame for cracks or distortion.
and scratches in inside bore of sleeve
R e p l a c e frame if defective. Inspect
b e a r i n g using a fine stone or crocus
tapped holes in frame. Replace frame
cloth dipped in dry cleaning solvent.
if threads are stripped or damaged be-
yond repair.
c . Repair of Brush Holder Assembly.
(2) Check field coils for insulation break-
down with ohmmeter. Attach one probe
(1) I n s p e c t insulations, plates, spacers,
of the ohmmeter to the frame and the
a n d brush holders for distortion and
other probe to one of the field coil ter-
cracks. Replace defective parts.
m i n a l s . The minimum reading should
not be less than one megohm. Replace
(2) Check brushes for cracks and excessive
defective coils.
w e a r . Check springs for cracks and
d i s t o r t i o n . Check brushes and spring
(3) I n s p e c t terminal screw for damaged
tension (step 1, fig. 10) for conformity
threads. Replace if threads are stripped
to wear limits (par. 41a). If any brushes
or damaged beyond repair.
a r e defective, replace entire set with
brush kit. Replace springs if they do
j. Thrust Washer and Spacer.
not conform to wear limits.
(1) I n s p e c t thrust washer and spacer for
cracked or deformed condition. Replace
defective parts.
(2) Check thickness of washer and spacer.
Replace washer or spacer if it does not
c o n f o r m to limits specified in wear
limits (par. 4 1 b ) .
27. REPAIR
Note. The following subparagraphs cover only
those parts wherein a repair operation will re-
turn the damaged part to serviceable condition.
Parts not detailed herein must be replaced when
they fail to pass the required inspection (par. 26).
a . Repair of Drive Housing.
(1) S m o o t h minor scratches, burs, and
d e n t s on machined surfaces of drive
housing using a fine mill file.
(2) Repair damaged threads in drive hous-
ing.
DIMENSIONS.
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