RepairClinic Item #1246110 | Whirlpool OEM Part #WPY312959
Dryer drum drive belt, 100 inches long, 3/8" wide,5 ribs 4 grooves. The drive belt wraps all the way around the dryer drum, around a tension pulley, and then around the drive motor pulley. If the drum will not turn when the dryer is turned on the belt is likely broken.
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Make sure the belt is aligned on the high part of the drum. If it is riding in the groove it will rub on the idler pulley guide arm.