Blender: Grinding or Squealing Sound

Your blender could be making a grinding or squealing noise because the bearings or bushings in the blade assembly are worn, allowing the blades to turn too freely and become noisy. Blades can also be called cutter assemblies, blending assemblies, or agitator assemblies. If the bearing needs to be replaced, it may be a good idea to replace the entire blade assembly at the same time. Most blade assemblies will unscrew easily from the bottom of the jar. Pop out the blade assembly and install the new one, replacing the seal and jar base in the same order you disassembled them.

The motor bearings on your blender could be worn, causing the grinding or squealing noise. It is uncommon to be able to replace the bearings alone, so you may need to replace the whole motor. Unplug the blender before beginning this repair, and detach the jar from the base. Flip the base over and remove the screws holding the plastic bottom cover on. Use a wrench to unscrew the nut which holds the inside plate in place. Carefully pull out the motor and fan, and detach the wires that connect the motor and blender base. There will likely be a yellow wire that connects the motor to the circuit board which needs to be detached with a soldering iron, and then re-soldered to the new motor. Once the old motor is removed, install the new one in reverse order.

The grinding or squealing noise from your blender can be caused by a damaged base, also known as a collar, seat, or container bottom. These can cause this problem if they are cracked or broken, not allowing the jar to seat properly on the motor base. The container base can become damaged from overtightening it to the jar over time. This is an easy part to replace on your blender. First make sure the blender is unplugged. Unscrew the container base from the jar, and pop out the blade assembly. Place the old blade assembly in the new container base, taking care to install the seal and blade components in the correct order. Screw your base back onto the blender jar.

Couplers, also known as couplings, could cause a grinding sound from your blender if they fail. They come in a variety of shapes and materials. Most of the time they are made to fail if the blades get overloaded. When the coupling is starting to fail it will make a lot of noise, usually meaning one of the teeth has snapped off. The coupling is located on the top of your blender base. To replace the coupling, first make sure your blender is unplugged. Use a screwdriver to gently pry the coupling off the base, slightly turning as your pry it off from different angles. When the coupling is removed, make sure the spindle below it has no pieces of metal from the old part stuck to it before installing the new one. The new coupling can be twisted onto the spindle. It will tighten through use of the blender.