Garbage disposal runs but makes a high-pitched squealing or screeching noise.

Safety first: Switch off power and do not continue to run a squealing motor; this can lead to seizure.

• Check for simple obstructions: Inspect the grinding chamber for metal fragments or hard debris that might be rubbing. Remove with pliers.
• Short test: After clearing, run the unit for a few seconds with water. If the squeal remains, the noise is likely from internal bearings.
• No user-serviceable bearings: Rangemaster disposal bearings are sealed within the motor assembly and cannot be lubricated or replaced individually in normal domestic models.
• Plan replacement: Continued use can cause the motor to seize and trip breakers. Schedule replacement of the disposal at the earliest convenience.