Garbage disposal vibrates excessively and causes the sink and countertop to shake during operation.

Safety first: Turn off power before placing tools or hands near the disposal opening.

• Clear the chamber: Remove any large or unevenly distributed debris using tongs. Run water and briefly test to see if vibration improves.
• Check mounting assembly: From under the sink, ensure the Maxmatic mounting ring is fully locked and all mounting screws are tight and evenly torqued.
• Inspect rubber mounts: Look for torn or missing rubber anti-vibration components between the disposal and mounting bracket. Replace if deteriorated.
• Assess impeller condition: If vibration persists with a clean chamber and tight mount, the impeller plate may be bent or unbalanced.

Severe or persistent vibration usually indicates internal damage; replacing the Maxmatic disposal is often more economical than attempting internal repairs.