Garbage Disposal Making Bad Sound

How do you go about it when your garbage disposal is making bad sound? Garbage Disposal Making Bad SoundThe sound could be either a malfunction or something hard could have entered the shredding chamber. In this case, it is advisable shut it off to avoid possible damage to shredding ring.

Normally, when a hard material such as coin, spoon or bone is caught in the shredding chamber, the garbage disposal responds with a rattling sound.

Here’re some pro tips to help you fix noisy a garbage disposal and keep it functioning.

Related: How to Unclog a Garbage Disposal with Standing Water

What Causes Abnormal Sound in a Garbage Disposal

1. Hard Objects

A garbage disposal works by hurling garbage against a shredding ring, where the object is broken into small piece. Hard objects such as spoons or bones are difficult to shred. They keep hitting the metal surfaces inside the shredding chamber and are associated with a clicking metallic noise.

If you don’t remove the metal objects, they may end up denting the shredder.

2. Internal Problem

When the garbage disposal has an internal problem, you’ll hear a rattling or grinding noise. Some of the common internal issues include:

  • Loose blades. This happens when the rivets holding the blades in place become loose.
  • Loose bearing. With time, the bearing shaft wears out thus causing a grinding sound.
  • Loose grinding plate. The grinding plate is connected to the motor by shaft and it rotates at about 2000 rpm. If the plate becomes loose at its connection with the shaft, then it’s likely to make a grinding sound.
  • The garbage disposal could also have other loose or broken parts which are making the unusual sound.

3. Stuck Objects

Whenever, an object is stuck between the shredding ring and the impellers, the flywheel comes to a standstill. As such the motor might trip off or keep making a humming sound.

How to Locate and Remove Objects from a Garbage Disposal

Step #1 – Safety First

Never work on garbage disposal when it connected to the power as this may lead to serious injuries. Most sockets for garbage disposals are locked inside the sink cabinet. Turn off the power and unplug the cable. If your garbage disposal is powered from somewhere else, locate the switch and turn it off.

Wear safety gloves to keep your hands free from cuts.

Step #2

Using a flash light, you can see the interior of the shredding chamber. Put your hand down there and remove any free object.

If the something is lodged between the blades and the shredding ring, then you might need to rotate the flywheel manually while pulling the object. In this case, you’ll have to detach the garbage disposal from the sink and work on it separately.

Step #3

You need a pipe wrench, pliers, screw driver, bucket and rags when detaching the garbage disposal from the sink. The bucket should be placed underneath the fittings to avoid spilling your floor with water or debris.

  • First, disconnect the discharge pipe from the garbage disposal. Also detach the dishwasher outlet if there’s one. Direct all the water and debris into the bucket.

Step #4

Now, it’s time to detach the garbage disposal from the sink. Be ready to bare the heavy weight during this step. If there’s someone around, they can hold it for you while you concentrate on detaching the unit from the mounting flange.

  • With the disposal supported on the underside, slip the screwdriver into one of the slots on the lower ring and turn it clockwise.
  • Lower the garbage disposal slowly to avoid damaging your floor.

Step #5

Fixing the detached garbage disposal is now easier and more convenient. It allows you to pull out the lodged object with one hand while jerking the flywheel using the other hand.

  • Insert the Allen wrench in the hex-shaped slot on the underside of the garbage disposal. The Allen wrench gives you the leverage to rotate the flywheel.
  • With one hand pulling the stuck object, rotate the flywheel back and forth with the other hand.
  • Once you remove all the lodged object, the flywheel should be able to rotate freely and the undesirable sound should now be gone.

Step #6

Reassembling the garbage disposal and pipes involves putting back the all the components in a reverse order.

  • Start by mounting the garbage disposal and locking it in place using the mounting ring.
  • Connect the discharge pipe and the dishwasher drain horse.
  • Tighten the connections and run water through the system to check for leakages.

Can You Repair Worn-Out or Broken Parts?

If the undesirable sound comes from the worn-out parts such as bearings, then there’s nothing much you can do to minimize noise from your garbage disposal.

Garbage disposals are designed with non-serviceable motors. So, if the bearing becomes defective, you might have to replace the entire unit.


While most garbage disposal are deigned to operate quietly, they can sometimes produce undesirable noise. A rattling sound could mean that some hard objects such as a metal, nut or bone has entered the shredding chamber.

A jammed flywheel makes a humming sound while a loose bearing is associated with a grinding sound.

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