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CPC-ZA Sanitary Self-Priming Centrifugal Pump Troubleshooting

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    Possible Malfunctions

    What are the main reasons of malfunction of a CPC-ZA Sanitary Self-Priming Centrifugal Pump?

    A malfunction in a pump system may be caused by various reasons and is not necessarily the pump itself. Issues with the pipework or other fluid accessories within the system can be contributing factors. Furthermore, if the operating conditions differ too greatly from the provided specification for which the pump was selected for can also be a major contributing factor.

    Consequently, it is always recommended to check the following first:

    • Has the pump been installed correctly?
    • Are the operating conditions still according to the initial specification?
    • Are the other fluid accessories within the pipework functioning correctly?

    Malfunction Causes and Solutions

    In general, the following malfunctions can be identified:

    1. Pump provides little or no flow
    2. Pump does not reach duty point
    3. Pump provides irregular flow
    4. Pump leaks
    5. Pump vibrates excessively
    6. Pump makes too much noise
    7. Motor overheats
    8. Motor / Pump cuts out on thermal overload
    9. Pump has seized

    Below is a table of the possible causes and solutions of these malfunctions.


    Cause Solution
    1 2 3 4 5 6 7 8 9
      X       X X     Electrical Connection is defective Have a qualified electrician check the connections
      X               Wrong Direction or Rotation Have a qualified electrician revers the direction of rotation of the electric motor
    X                 Pump is not completely filled with liquid Fill the pump casing entirely with fluid and fit a non-return valve to the suction side
    X X X     X       Insufficient Suction Pressure Increase the suction pressure or lower position of the pump further below the fluid level
      X           X   Pump operating at the wrong speed Check the motor speed
                    X Contamination or objects are lodged within the pump which are larger than the solids handling capacity Clean the pump and install a suction filter if necessary
    X X X             Air in the pipework Inspect the pipework and avoid upward rising bends in the pipework
      X               Valve in the suction pipework is not completely open Entirely open the valve
      X               Pump has been selected with too low a delivery pressure Install a larger pump or install a booster pump
    X X X           X Suction pipe or filter is blocked Clean the suction pipe or filter
          X           Shaft Seal is defective Replace the Seal
          X           O-Ring is defective Replace the O-Ring
                  X   Liquid Temperature is too high Decrease the liquid temperature
    X             X X Impeller is jammed Unclog the impeller and replace if necessary
            X X   X X Impeller is damaged Replace the impeller
            X X X X X Motor Shaft is bent Replace the motor
            X X X X X Extension shaft is loose Inspect the extension shaft, reassemble and readjust
            X X X X X Bearings are damaged or worn Replace the motor, for IG(H) replace the bearings.
                  X X Motor is overloaded Check the viscosity of the fluid.

    Switch off the motor and check if the pump does not drag, if so, disassemble and repair.

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