MIL-HDBK-1164
Table 12 (Continued)
Symptom
Possible Cause
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 temperature.
Pump overheats and seizes.
Pump not primed.
Operation at very low capacity.
Parallel operation of pumps unsuitable for existing
conditions.
Misalignment.
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.
Lack of lubrication.
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