If you are using an adapter with your food processor, such as an adapter stem, it may not be aligned correctly, resulting in a grinding or squealing noise. Make sure your adapter or extension stem is lined up with the bowl and other parts, and secured in place before using.

The blades on your food processor could be causing a grinding or squealing sound when you operate it. The core of this issue is the shaft which can be attached to the motor by a stem. If this part becomes worn, cracked, or broken, the motor can become overworked or misaligned, resulting in a grinding noise. Because the blades also connect to the motor shaft, they can cause the noise to occur.

The gears on your food processor motor shaft can become stripped, resulting in a grinding or squealing noise. To replace the shaft, first make sure the unit is unplugged. Pull the blade mechanism off the blade shaft and remove the bowl. Remove the screw covers and screws from the base using a spudger and a screwdriver. Lift off the drive shaft and replace with the new one.

The motor shaft has a plastic sleeve, sometimes called a stem. A stem can also be the part that holds the disks in place. If the stem or shaft is damaged or broken, it can cause a grinding or squealing noise. The stem can be easily removed through normal use, so if it needs to be replaced simply take it off and insert a new one.

The exchangeable disks you use in your food processor to process foods to different consistencies will be aligned with the motor shaft via the stem. If one of these parts is out of place, a grinding or squealing noise can occur. Take apart the stem, blade, and disk and reassemble them to make sure they are aligned properly.