Garbage disposal emits a high-pitched squeal or screeching noise when running.

Safety first: Turn off power before inspecting the unit. Do not continue to run a squealing disposal; it can seize and trip breakers.

• Check for leaks: Inspect for water around the motor housing that may have caused bearing damage. Repair any leaks at the sink flange or connections.
• Manual spin test: Rotate the impeller plate via the hex port. If it feels rough, gritty, or binds, the bearings are likely failing.
• Listen during brief test: Restore power and run the unit for only a second or two with water to confirm the squeal originates from the motor area.
• Avoid lubrication attempts: Motor bearings in disposals are sealed and not serviceable.

Persistent squealing or screeching indicates bearing failure; the correct remedy is replacement of the Maxmatic disposal unit.