Thomas J Dawson , GA December 11, 2019 Appliance: Whirlpool Electric Dryer RED4640YQ1 Whirlpool Dryer Red4640yq1: Roller had a worn spot causing the drum to bump every time it went around. How to replace Dryer Drum Belt 92-1/4" 4-Rib. Flip up top, removed front panel, take belt loose and removed drum. replaced both rollers, replaced felt seal rings on both of drum, reset drum in unit, install new belt, reassemble. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes