Symptom
Cause
Remedy
Bearing damaged
Replace
Check lubricant and bearing space for
pollutants (rinse oil area)
System-related vibrations (resonance) Seek assistance
Temperature in pump too high
Flow too little
Increase min. flow (open discharge
valve, bypass)
Pump and/or pipes not completely fil-
led with liquid
•
Fill
•
Vent
Suction height too big / NPSH of sys-
tem too small
•
Increase liquid level and admis-
sion pressure
•
Reduce resistance in the intake/
suction pipe (change course and
rated width, open shut-off valves,
clean filters)
Temperature in shaft sealing too
high
Stuffing box is fastened too tight resp.
shaft sealing is worn
•
Loosen stuffing box
•
Replace packing and/or mechan-
ical seal
•
Check sealing, flushing and cool-
ing pipes (pressure) avoid dry
running
Lines and roughness at shaft or shaft
sleeve
Replace parts
Unsuitable packing material
Use suitable material (check shaft or
shaft sleeve for damage beforehand
Deposits on mechanical seal
•
Clean
•
Replace mechanical seal if nec-
essary
•
If necessary provide additional
rinsing or quench
Temperature at the bearing too
high
Back-pressure too low, discharge too
low
Throttle discharge valve
Flow too big
Reduce flow (throttle discharge valve)
Inner components suffering from wear Replace worn parts
Coupling guard not aligned
Align pump unit better
Coupling distance too small
Change
Forces in pipeline too high (pump unit
under strain)
•
Change (support pipes, use
compensator’s, etc.)
•
Is foundation plate/frame proper-
ly cast in place?
Too much, too little or the wrong type
of lubricant
Change
Bearing damaged
Replace
Check lubricant and bearing space for
pollutants (rinse oil area)
Relief fittings insufficient
•
Clean relief openings in impeller
•
Replace worn parts (impeller,
split rings)
•
Adjust in line with the system
pressure/intake pressure given
on ordering
8.1 Operation troubleshooting
Model ICP, ICPI, ICPH, ICPIH Installation, Operation and Maintenance Instruction
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