A drum that will not turn while the motor runs almost always comes down to the belt or the parts it drives.
Broken Drive Belt
The thin belt that wraps the drum snaps with age, so the motor spins freely.
Fix: A new belt is an inexpensive, common repair.
Worn Drum Rollers or Idler Pulley
Seized rollers or a frozen idler pulley can stop the drum and strain the motor.
Fix: Replace rollers and the idler pulley together while the dryer is open.
Failed Drive Motor
If the motor only hums or is silent, it may have failed.
Fix: Motor replacement restores tumbling and is best left to a technician.
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