Symptom
Cause
Remedy
Check that the suction pipe is vacuum-
tight.
Provide valves and fittings in the suction
pipe with water seal.
The direction of rotation is wrong.
Change the motor rotation.
The inner components are suffering
from wear.
Replace the worn parts.
The density and/or viscosity of the
pumped liquid is too high.
Seek assistance.
The head is too high.
The speed is too high.
Reduce the speed.
Compare the speed of the motor with the
specified pump speed. See the rating
plate.
When you adjust the speed (frequency
transformer), check the reference value
setting.
The impeller diameter is too large.
Use a smaller impeller.
The drive mechanism is overload-
ed
The back pressure and discharge
pressure are too low.
Throttle the discharge valve.
The speed is too high.
Reduce the speed.
Compare the speed of the motor with the
specified pump speed. See the rating
plate.
When you adjust the speed (frequency
transformer), check the reference value
setting.
The impeller diameter is too large.
Use a smaller impeller.
The density and/or viscosity of the
pumped liquid is too high.
Seek assistance.
The shaft seal is worn.
Replace the mechanical seal.
Check the sealing, flushing, and cooling
pipe (pressure).
Avoid running the pump dry.
There is not enough sealing.
Tighten the screws.
Replace the mechanical seal.
The discharge pressure is too low.
Increase the minimum amount being car-
ried. Open the control valves and bypass
piping.
There is not enough hydraulic thrust
balance.
Clean the relief holes in the impeller.
Replace the worn impeller and wear
rings.
The pump is not running quietly.
The pump and/or pipes are not com-
pletely filled with liquid.
Fill with liquid
Vent the pump and/or pipes.
The NPSH is too low.
Increase the liquid level.
Increase the suction pressure.
Reduce the resistance in the intake/
suction pipe. Change the course and
pipe size, open the shutoff valves, and
clean the filters.
The inner components are suffering
from wear.
Replace the worn parts.
7.2 Operation troubleshooting
Model 3355 Installation, Operation, and Maintenance Manual
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