MIL-HDBK-1164
Table 12 (Continued)
Symptom
Possible Cause
Excessive grease or oil in antifriction-bearing
housing, or lack of cooling, causing excessive
bearing temperature.
Lack of lubrication.
Improper installation of antifriction bearings
(damage during assembly, incorrect assembly of
stacked bearings, use of unmatched bearings as a
pair, etc.).
Dirt getting into bearings.
Rusting of bearings because of water getting into
housing.
Excessive cooling of water-cooled bearing
resulting in condensation in the bearing housing of
moisture from the atmosphere.
Bearings have short life.
Misalignment.
Shaft bent.
Rotating part rubbing on stationary part.
Bearings worn.
Shaft running off center because of worn bearings
or misalignment.
Rotor out of balance, resulting in vibration.
Excessive thrust caused by a mechanical failure
inside the pump or by the failure of the hydraulic
balancing device, if any.
Excessive grease or oil in antifriction-bearing
housing or lack of cooling, causing excessive
bearing temperature.
Lack of lubrication.
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