n
22
Symptom on Pump
Trouble
Inspection and
Countermeasures
With Discharge
Valve Closed
With Discharge
Valve Open
Cause
l
Foundation is inad-
equate.
l
Anchor bolt is loose.
l
Suction pipe is
closed or restricted.
Cavitation is caused.
l
Wear or melting of
pump bushing.
l
Damaged inner
magnet assembly or
pump spindle.
l
Fluctuating dynamic
balance of outer
drive magnet assem-
bly
l
Wear of motor
bearing.
Pump
vibrates.
¡
Carry out installation
process again.
¡
Retighten bolt.
¡
Clean, eliminate cause
of cavitation.
¡
Replace.
¡
Replace.
¡
Remove or replace.
¡
Replace bearing or
motor.
