Safety first: Unplug the microwave before handling glass components if they are hot.

Remove and clean: Take out the glass tray and roller ring. Clean all parts and the cavity floor thoroughly.
Inspect roller ring: Check for flat spots on wheels or broken sections. Replace if worn or damaged.
Check coupler: Ensure the coupler is firmly seated on the motor shaft and not rubbing against the cavity floor.
Re-seat tray: Place the tray back so its center hub engages fully with the coupler.

Microwave makes a rattling or scraping noise when the turntable rotates.

Possible Causes