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

Safety first: Unplug the microwave before reaching inside to inspect parts.

• Remove and clean: Take out the glass tray and roller ring. Wash them with warm soapy water, dry thoroughly, and wipe the cavity floor.
• Inspect components: Check the roller ring for flat spots or broken wheels. Inspect the glass tray for chips or cracks, especially around the center.
• Check coupler: Look at the plastic coupler on the floor of the cavity. Ensure it is not cracked and sits firmly on the motor shaft.
• Replace worn parts: Install a new Oster-compatible roller ring, glass tray, or coupler if any are damaged.