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 TM 5-683/NAVFAC MO-116/AFJMAN
Table 4-3. AC induction motor trouble-shooting-continued.
Maintenance
Probable Cause
Trouble
or replace
Tighten,
if possible,
Rotor winding with
At higher than
with another rotor.
Loose connections.
normal temperature
or smoking (Cont'd)
Remove excessive pressure o n
Belt too tight.
bearings.
Replace with motor designed for
Motor used for rapid
this service.
reversing service.
Make sure end shieds fit squarely
End shields loose or
Bearings Hot
and are properly.
not replaced
properly.
Reduce belt tension or gear
Excessive belt
pressure end realign shafts. See
tension or excessive
that thrust is nott being
gear side thrust.
transferred to motor bearing.
Straighten Shaft.
Bent shaft.
oil.
A d d oil - i f o i l s u p p l y i s v e r y
Insufficient
Sleeve Bearings hot.
flush and refill.
low - drain,
D r a i n o i l , flush, and relubricate
Foreign material in
using industrial lubricant
oil or poor grade of
oil.
recommend by a reliable oil
company.
Oil too heavy; drain and replace.
Oil rings rotating
slowly or not
Oil ring has work spot; replace
rotating at all.
with new ring.
Level motor or reduce
tilt
and
M o t o r titled too far.
realign, if necessary.
Replace rings.
Rings bent or
otherwise damaged in
reassembling.
Adjust or replace retaining clip.
Ring out of slot (oil
ring retaining clip
out of place).
Resurface
Replace bearings.
Defective bearings or
shaft.
rough shaft.
R e m o v e relief plug and let motor
Ball
Too much grease
bearings hot.
run.
If excess grease doe not
come out, flush and relubricate.
Add proper grease
Wrong grade of grease
Remove relief plug and regrease
grease.
Insufficient
bearing.
make
Flush bearings, relubricate;
Foreign material in
sure that grease supply is clean.
grease
(Keep covered when not in use).
Align motor and check bearing-
Bearings misaligned
housing assembly.
See that races
are exactly 90 degrees with shaft.
4-28
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