Table 12 (Continued)
Improper installation of antifriction bearings
(damage during assembly, incorrect assembly of
stacked bearings, use of unmatched bearings as a
Dirt getting into bearings.
Rusting of bearings because of water getting into
Excessive cooling of water-cooled bearing,
moisture from the temperature.
Pump overheats and seizes.
Pump not primed.
Operation at very low capacity.
Parallel operation of pumps unsuitable for existing
Rotating part rubbing on stationary part.
Shaft running off center because of worn bearings
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.