Whitey L Whitehall , MT March 18, 2018 Appliance: Maytag Gas Dryer MDG7400AWW Maytag Dryer Mdg7400aww: Broken belt tension pulley. How to replace Belt Tension Pulley. Removed and replaced the belt tension pulley as well as the idler pulley arm. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes