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Faults
11|2018 EN 25
7 Faults
NOTICE
It is normal for a few drops of water to escape from the mechanical seal from time to time. This is
especially true during the break-in period.
Depending on the water quality and number of operating hours, the mechanical seal can begin to
leak.
 If water leaks constantly, have the mechanical seal replaced by a qualified technician.
7.1 Overview
Fault: Leak along the shaft
Possible cause Solution
Shaft seal worn or damaged.  Check pump for impurities.
 Replace the shaft seal.
Mechanical seal in a new pump is
stuck.  Open and close the pressure valve quickly during
operation.
Shaft seal assembled incorrectly.  Assemble the shaft seal correctly. Use water and
soap as lubrication.
Elastomer damaged due to pumped
fluid.  Use a suitable elastomer for the shaft seal.
Too high a pressure.  Use a suitable shaft seal combination.
Pump shaft is damaged.  Replace the shaft.
Pump running dry.  Replace the shaft seal.
Axial clearance set incorrectly.
 Set the axial clearance correctly.
Fault: Leak along the pump sleeve
Possible cause Solution
Worn O-ring.  Replace O-ring.
O-Ring isn‘t resistant to the pumped
fluid.  Use an O-ring made from a suitable material.
Pump not mounted free of tension.  Remove the pressure from the pump and pipes.
 Support the connections.
 Install compensators where necessary.
Fault: Pump vibrates and/or causes noise.
Possible cause Solution
Coupling mounted incorrectly.
 Mount the coupling parts parallel to each other.
Pump is not filled with media.
 Fill and vent pump.
Little or no intake.  Ensure sufficient supply of media.
 Check and repair pipework.
Pump and/or motor bearings are
damaged.
 Replace bearing.
NPSH value is too high (cavitation)
 Improve suction conditions.
Pump is not working within its operating
range.  Adjust the system to operation within the operating
range or select an appropriate pump.
Deposits or blockages in the inner
pump.
 Clean pump and pump parts.
Pump is placed on an uneven surface.  Use an even surface or fix the pump to the ground.