If your dryer makes a loud thumping noise, it usually means one of the internal components that supports the drum is worn, loose, or obstructed. Dryers rotate a heavy drum while drying clothes, and when parts inside the machine begin to wear out, the drum may move unevenly and produce a thumping sound.
Below are the most common reasons a dryer makes a loud thumping noise.
Worn Drum Rollers
Dryer drums are supported by drum rollers that allow the drum to spin smoothly.
Over time, these rollers can wear down or develop flat spots. When that happens, the drum may rotate unevenly and create a repetitive thumping sound.
Signs of worn rollers include:
- rhythmic thumping sounds
- noise that becomes louder during longer cycles
- uneven drum movement
Replacing worn rollers often restores quiet operation.
Flat Spots on the Dryer Drum
If a dryer has not been used for a long time, the drum rollers can develop flat spots where they were resting. When the dryer begins spinning again, the rollers may produce a thumping noise until they round out again.
Running the dryer for a few cycles may sometimes resolve the issue.
Loose Items in the Drum
Sometimes the noise is caused by objects hitting the drum as it rotates.
Common items include:
- coins
- buttons
- belt buckles
- zippers
Checking pockets before washing can prevent these items from entering the dryer.
Worn Dryer Belt
The dryer belt helps rotate the drum. If the belt becomes worn or stretched, the drum may move slightly off balance and create a thumping or slapping sound.
A failing belt may also cause the dryer to struggle during the drying cycle.
Quick Recap
If your dryer makes a loud thumping noise, the most common causes include:
- worn drum rollers
- flat spots on rollers
- loose objects inside the drum
- worn dryer belts
Thumping noises can sometimes occur alongside burning smells during dryer operation.
Inspecting these parts can usually identify the source of the noise.
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