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TM 55-2915-335-30&P
2-22. PUMP-END MOTOR BEARING - lNSPECT/REPLACE (Cont)
2-22
f.
Check bearing I.D. Using plug gage (Item 2, Ap-
pendix B, Section III) check bearing bore. If
0.3135 GO gage does not pass through bearing,
ream bearing as follows
(1)
Install reamer (7, Item 1, Appendix B, Sec-
(2)
(3)
tion III) in drill press. Set drill press spindle
speed to between 560 and 690 RPM.
A 3/8 inch (10 mm) spacer block is required
between impeller housing and drill press.
This is to protect the positive terminal.
Place impeller housing (2) on support plate
of drill press, as shown. Make sure housing is
not resting on the positive terminal. With
drill press OFF, bring reamer down to bear-
ing. Center bearing bore to reamer.
NOTE
Make only one quick pass in and out of
bearing bore. If reamer is allowed to dwell
in bore, too much material will be
removed from bearing.
(4)
(5)
Hold housing (2) in place on support plate.
Turn drill press ON. Bring reamer down
slowly to top of bearing. Ream bearing to size
with one quick pass in and out of bearing
bore.
Using plug gage (Item 2, Appendix B, Section
III) check bearing bore diameter B. If 0.3145
NO GO gage passes through bearing, re-
place bearing.
4. TI INSPECT. Inspect bearing to make sure diameter
is within dimensions specified. Visually inspect to
make sure bearing is fully seated and not chipped or
damaged.
NOTE
FOLLOW-ON MAINTENANCE: Install pump cover and inlet seal
(paragraph 2-21). Install pump-end brush holder assembly
(paragraph 2-20).
END OF TASK
2-79
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