PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13
Page 36 of 40 flowserve.com
Motor protection triggered
Unit runs but does not pump
Unit vibrates or is noisy
Motor loses filling liquid
Pump requires excessive power
Pump does not draw in water at start
Insufficient pressure developed
Insufficient capacity developed
Abrasive solids in liquid pumped.
Check and consult Flowserve.
Internal misalignment due to improper repairs
causing impeller to rub.
Check method of assembly, possible damage
or state of cleanliness during assembly.
Excessive thrust caused by a mechanical
failure inside the pump.
Check wear condition of impeller, its
clearances and liquid passages.
Improper installation of bearings.
Check method of assembly, possible damage
or state of cleanliness during assembly and
type of bearing used.
Damaged bearings due to contamination.
Check contamination source and replace
damaged bearings.
Slide valve not fully open.
Pressure pipe clogged. Foreign body in the
pipe line.
Pump blocked by impurities inside the pump.
Disassemble pump section and clean.
Check smooth running of motor/pump.
Remove unit and regenerate well.
Coupling between pump and motor faulty.
Suction strainer clogged up.
Remove unit and clean suction strainer.
Wrong direction of rotation of motor.
Reverse two phases at motor terminal box.
Motor circuit breaker incorrectly adjusted.
Readjust motor circuit breaker according to
data card or rating plate.
Motor running too slow. Under voltage or
wrong frequency.
Check if system voltage and frequency agree
with data sheet.
Examine power cable for damage. Check
fuses.
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