McAlpine Loose or Damaged Impeller Assembly

Disposal produces a loud banging or knocking noise during operation, causing the sink to shake.

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.

Possible Causes

Loose McAlpine impeller arm, Bent impeller plate, Broken grinding lugs, Foreign object repeatedly striking chamber wall

Safety first: Turn off power immediately. Do not continue to run the unit while it is banging.

Inspect for foreign objects: Shine a torch into the chamber and remove any visible hard objects with pliers.
Check impeller movement: Use a tool to rotate the plate and gently move the impeller arms. They should pivot but not be excessively loose.
Assess damage: If an impeller arm is broken or the plate is visibly warped, the grinding assembly must be replaced.

Medium 3/5

Impeller Plate Assembly

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