OPERATIVE INSTRUCTIONS
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Trouble-shooting guide
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Possible cause and remedies
x
x
Pump speed too low.
1) If drive is variable speed, increase speed at
pump.
x
x
x
x
x
Discharge too high or suction head too low
(cavitation).
1) Reduce suction losses; lower liquid temperature,
install pump at lower elevation.
x
x
x
x
x
x
Pump running dry.
1) Fill pump: provide dry run protection: relocate
suction piping.
x
x
x
x
x
Stator or Rotor worn out.
1) Check rotor and stator. Replace the worn out
parts.
x
Joints worn.
1) Replace the worn out pieces.
x
Pump speed too high.
1) If drive is variable, set at lower speed.
x
Viscosity too high.
1) Measure specific gravity and compare to specified
specific gravity.
X
x
x
x
x
Pressure head too high.
1) Check pressure head with manometer. Reduce
the pressure head by increasing the pressure pipe
diameter or by shortening the pressure pipe.
x
x
Wrong direction of rotation.
1) Reverse polarity of drive motor.
x
x
Mechanical seal worm or damage.
1) Replace the mechanical seal.
x
x
Pump bearing worn (Housing bearing version).
1) replace bearings, lubricate seal
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