Troubleshooting
Malfunction number
12 34
5
6
7
89
Cause
Remedy
XX
–
XX
–––
Excessive amount of gas: pump is
cavitating
Check the cable gland.
Clean/enlarge the filter.
Enlarge the supply/suction pipe
cross-section.
XX
–
X
––
X
–
Shaft seal leaky
Replace the shaft seal.
XX
––
X
–
X
–
X Pump not heated, pumpe d liquid hardens Heat the pump.
Check the temperature of the liquid and
adjust it if necessary.
XX
––
X
––
X
–
Solids content too large, grain size too
large
Reduce speed.
Install strai ner with the permitted mesh
size in the suction pipe.
XX
–– ––
X
–
X
Solids sediment in the liquid during a lon g
standstill
Flush the pump.
Dismantle an d clean the pump.
XX
––
XX
–
X
–
Pumped liquid temp erature too high
Stator expansion t oo large, stator burned
or swollen
Check the temperature of the liquid and
adjust it if necessary.
Allow the pump to cool down and check
that rotor can move freely. If necessary,
remove pump and repl ace the stator.
XX
–
X
––
XX
–
Foreign particles in the pump
Check pump for foreign particles. If
necessary, disassemble the pump and
remove foreign particles.
X
––––––
X
–
Adhesion between the rotor and stator
Turn the pump by hand, use aids if
necessary.
–
XXXX
––––
Suction pipe and shaft seal leaky
Check suction pipe and shaft seal for
leaks.
–
X
–
X
––––
Motor speed too low
Compare the required motor speed
with the specifications on the pump
nameplate. Replace the motor if
necessary.
Increase the motor s peed if speed
control is available.
–
X
–
X
––––
Supply/suction pipe not fully opened
Open the fitting.
–
X
–
X
–––––
Low speed for liquids w ith low viscosity
and high suction volume
Increase speed.
–
X
–
X
––
X
––
Packing gland not tightened or packing
rings worn
Tighten the stuffing box gland on the
packing gland.
Check packing rings and replace if
damaged/worn.
–
X
–
X
–
X
––
X
No liquid in the feed/suction pipe
Ensure inflow of pumped liquid.
–
XXX
–––––
Pumped liquid viscosity too high
Check the viscosity of the pumped liquid.
–
X
–
XX
–––
Supply/suction pipe cross-section too
narrow
Enlarge the supply/suction pipe
cross-section.
Remove any encrustatio ns from the
suction pipe.
Open the fitting completely.
–
X
–
XX
–––
Suction head excessive:
NPSH
pump
larger than NPSH
system
Increase the suction pressure.
Consult the manufacturer.
260371 – 176-982/0 BA-2020.05 en-US AE 31
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