RepairClinic Item #529597 | Whirlpool OEM Part #341241
Dryer drum drive belt. The belt is flat, 92-1/4 inches long, 1/4 inch wide and has 4 ribs and 3 grooves. It replaces many other belts, including some with 5 ribs and 4 grooves. If the drum does not turn, but you can hear the motor running then there is a good chance the belt has broken.
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Consider replacing the idler assembly while you have the dryer apart.