Unplug the PDET910AYW from the electrical outlet.
Insert the putty knife blade between the top panel and front panel. Lift the knife up on the right and left corners to unhook the top panel from the cabinet of the Performa dryer.
Lift the top panel up to rest on its hinges.
Remove the screws near the top of the front panel on the right and left sides. Lift the front panel up to detach it from the cabinet.
Disconnect the wire connector leading to the door switch. Set the front panel aside.
Move the idler pulley arm toward the front of the Performa PDET910AYW dryer to relieve belt tension.
Remove the belt from the pulleys and drum.
Wrap the new belt around the drum. Feed the other end around the pulleys. Move the idler pulley arm toward the back of the Performa PDET910AYW dryer to tighten the belt.
Replace the front panel. Connect the door switch connector into its socket. Install the 2 screws that hold the panel in place.
Lower the top panel. Press down on the panel to engage the two internal clips.