Flowserve N-Series Worthington - Manual (Page 13)

N-SERIES OF THRUST POT USER INSTRUCTIONS ENGLISH 07/14
Page 13 of 20
5.0 FAULTS; CAUSES AND REMEDIES
FAULT SYMPTOM
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Bearings have short life
PROBABLE CAUSES POSSIBLE REMEDIES
MECHANICAL TROUBLES
Shaft bent. Check shaft runouts within acceptable values
Rotating part rubbing on stationary part
internally.
Check for signs of this and consult Flowserve if necessary
Bearings worn Replace bearings
Shaft running off center because of worn
bearings or misalignment.
Check misalignment and correct if necessary. If alignment satisfactory
check bearings for excessive wear
Excessive grease in ball bearings. Check method of regreasing
Lack of lubrication for bearings.
Check hours run since last change of lubricant, the schedule and its
basis
Improper installation of bearings
Check method of assembly, possible damage or state of cleanliness
during assembly and type of bearing used
Damaged bearings due to contamination. Check contamination source and replace damaged bearings
ELECTRICAL TROUBLES
Motor running too slow, Check motor terminal box connections