Certikin
Failed Mechanical Shaft Seal
Visible water leak from the area between the pump housing and motor, especially when running.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn mechanical seal faces, dry‑running of pump, chemical attack from incorrect water balance, misalignment of wet end
How to Fix / Troubleshooting
Safety: Isolate power and close isolation valves on suction and return before removing the pump.
- Confirm leak source: Dry the pump and observe while briefly running. If water appears from the join between the motor and pump housing, the mechanical seal is likely failed.
- Disassemble wet end: Remove the motor from the Certikin pump housing, then remove the impeller to access the mechanical seal components.
- Replace seal: Fit a genuine Certikin mechanical seal kit, ensuring the ceramic seat is clean and fully seated in the housing and the rotating carbon face is correctly installed on the shaft.
- Reassemble and test: Refit the impeller and motor, ensure all bolts are tightened evenly, then reopen valves and test for leaks.
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Repair Difficulty
Hard
4/5
Required Part
Certikin mechanical shaft seal
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