Symptoms
- Disposal shakes noticeably when running
- Whole cabinet seems to vibrate
- Unit feels loose or wobbly when touched
- Noise is louder than it used to be
Likely causes
- CommonLoose mounting ring screwsThe three mounting bolts that secure the disposal to the sink flange can loosen with use.
- CommonWorn rubber mounting gasketA degraded gasket lets the unit shift slightly during operation.
- PossibleUnbalanced flywheel from wear or debris buildupUneven wear on the flywheel can cause vibration even when properly mounted.
- Less commonDisposal not fully seated in the mounting ringIncomplete installation can leave it loosely attached.
What to do
- Turn off and unplug the disposal before working on it.
- Check that the unit is fully twisted and locked into its mounting ring, following the arrows or tabs on the ring.
- Tighten the three mounting screws that hold the sink flange assembly evenly and in sequence.
- Inspect the rubber gasket at the flange for cracking or flattening and replace it if worn.
- Restore power and run the disposal briefly to check whether vibration has improved.
- If vibration continues after a secure remount, the flywheel or motor mount inside the unit may be worn.
Tools and parts
- Screwdriver
- Adjustable pliers
Disposal mounting gasket kitSearch: “garbage disposal flange mounting kit”
When to call a pro
If tightening the mount doesn't stop the vibration, a plumber can check for internal wear that usually means it's time to replace the unit.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.