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PROBLEM
PROBABLE CAUSE
REMEDY
4.
Pump is noisy
a.
Magnetic hum.
a.
Consult motor manufacturer.
b.
Motor bearings are worn.
b.
Replace bearings.
c.
Foreign matter is rotating
c.
Remove casing and remove
with impeller.
foreign matter.
d.
Rotors are binding.
d.
See 3.b. on the previous page.
e.
Motor shaft is bent or worn.
e.
See 3.c. on the previous page.
f.
Power frame shaft is bent
f.
See 3.d. on the previous page.
or worn.
g.
Power frame bearings are
g.
See 3.e. on the previous page.
worn.
h.
Excessive misalignment
h.
See 3.f. on the previous page.
between pump and driver.
i.
Cavitation.
i.
See note at beginning of
Troubleshooting
section.
5.
Excessive
a.
Pump is not leveled properly. a.
Level pump.
vibraton
b.
Excessive misalignment
b.
See 3.f. on the previous page.
between pump and driver.
c.
Rotors are damaged.
c.
Replace rotors.
d.
Piping is not supported.
d.
Support discharge and suction piping.
e.
Power frame shaft is bent
e.
See 3.d. on the previous page.
or worn.
f.
Cavitation.
f.
See note at beginning of
Troubleshooting
section.
6.
Pump leaks
a.
Casing cover loose.
a.
Tighten casing nuts.
b.
Damaged inlet or outlet
b.
Replace casing.
fittings.
c.
Casing cover o-ring
c.
Replace o-ring.
defective.
d.
Casing o-rings defective.
d.
Replace o-rings.
e.
Mechanical seal worn or
e.
Replace seal.
defective.
TROUBLESHOOTING