Garbage disposal makes a rattling noise only at startup and shutdown, but runs smoothly in between.

Safety First: Turn OFF power before tightening any hardware.

Step-by-step:

• 1. Check mounting ring: Ensure the KitchenAid disposal is fully locked into the mounting assembly and there is minimal vertical play.
• 2. Support piping: Add or tighten pipe hangers and brackets to reduce rattling of drain pipes.
• 3. Add padding: Place foam or rubber pads between pipes and cabinet walls where they contact.
• 4. Observe operation: Brief rattling at start/stop can be normal; focus on changes over time.
• 5. Monitor: If the noise worsens or becomes continuous, re-evaluate for loose components.

When to call a technician: If you suspect structural issues with the sink or mounting assembly, professional assessment is helpful.