Operating instructions B-Series
Version 2.4, En Page 59 of 81 21-10-2005
Malfunction Cause Possible solution
Pump jolts and
makes noise
Pump and suction line are not fully filled Fill pump housing with the correct liquid
Inlet of the suction line is insufficiently
submerged
Further submerge suction line
Foreign object in the rotor Clean rotor
The shafts are not precisely in line Align unit
The base is distorted by poor supports or
has vibrated loose
Readjust unit, fix again firmly and align
The shaft is buckled Replace shaft
Turning parts run against stationary parts Adjust and align as necessary
The bearings are worn Replace bearings, follow service plan
The wear plates or rotor are worn Replace rotor or parts subject to wear
The rotor is damaged Repair or replace
The shaft runs eccentrically with worn
bearings or poor alignment
Replace and align bearings
The turning parts are out of balance
(vibrating)
Find imbalance
Ineffective lubrication or insufficient
lubricant in the bearing housings, possibly
as a result of a leak; noticeable at
increased temperature
Follow service plan
Insufficient lubrication Follow service plan
The bearings are soiled Replace bearings
Rust formation in the bearings due to
penetrated moisture
Replace bearings, prevent pump coming
into contact and with moisture with large
temperature differences.
The suction head is too great or there is
too little difference between the run-off
height and the vapour pressure of the
liquid (too low NPSH)
Position pump lower
Choose other pump
There is a blockage in the suction line Clean
The pump does not work at the correct
operating point
Adjust piping system if possible.
Choose other pump
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