Grisel W Toms River , NJ February 28, 2016 Appliance: Whirlpool Gas Dryer WGD4900XW1 Whirlpool Dryer Wgd4900xw1 / : Dryer not running. How to replace Dryer Timer. Opened the back panel unscrewed the old timer out and replaced it with the new. Closed everything back up and turned on the unit. I was never so excited to see a part come in the mail. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes