MIL-HDBK-1164
Table 12 (Continued)
Symptom
Possible Cause
Incorrect type of packing for operating conditions.
Shaft running off center because of worn bearings
or misalignment.
Rotor out of balance, resulting in vibration.
Gland too tight, resulting in no flow of liquid to
lubricate packing.
Excessive clearance at bottom of stuffing box
between shaft and casing, causing packing to be
forced into pump interior.
Dirt or grit in sealing liquid, leading to scoring of
shaft or shaft sleeve.
Packing has short life.
Water-seal pipe plugged.
Seal cage improperly located in stuffing box,
preventing sealing fluid from entering space to
form the seal.
Misalignment.
Shaft bent.
Bearings worn.
Shaft or shaft sleeves worn or scored at the
packing.
Packing improperly installed.
Incorrect type of packing for operating conditions.
Shaft running off center because of worn bearings
or misalignment.
Rotor out of balance, resulting in vibration.
Gland too tight, resulting in no flow of liquid to
lubricate packing.
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