The repair took about 30 minutes. I unplugged the dryer and unscrewed and removed back/top panel. I photographed the timer unit inside so that I had a record of how it was wired. I removed the dial from the front, making sure to keep the small metal collar that is on the dial post (it may have remained in the dial hole in your case. This is needed to keep the dial securely on the timer post.) I then removed the two screws on the front. I removed the wires, noting how they are attached. I attached the wires to the new timer, inserted it into the hole and screwed it into place. I screwed the rear panel back into place, pushed the dial into place (only fits one way), plugged the cord in and it worked as usual. I used part #WP33001730 (AP6007935) for my Maytag MDE4000AYW.