McAlpine Internal Rubbing / Misaligned Rotor

Disposal runs but makes a low grinding noise even when empty, as if metal is rubbing inside.

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

Warped grinding plate contacting chamber, Foreign object lodged between plate and ring, Misaligned motor shaft, Debris under impeller plate

Safety first: Turn off power at the breaker.

Check for debris: Use a torch and pliers to remove any visible objects from the chamber.
Rotate plate manually: Use the hex key at the base to rotate the shaft. Feel for tight spots or scraping.
Flush thoroughly: Run water while briefly operating the unit to flush out small particles.

If scraping persists and no debris is found, the rotor or plate may be misaligned, requiring replacement of the grinding assembly or unit.

Medium 3/5

Grinding Plate / Motor Shaft

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