Unplug the washer from the wall outlet.
Pull the timer knob off of the front of the timer. If the timer knob is stuck, wrap string around the base of the knob. Pull the knob off of the timer post using the string to provide additional leverage.
Remove the screws from the top of the control panel and rotate the control panel forward.
Remove the screws securing the timer to the interior of the control panel housing.
Install the new timer using the screws you removed from the control panel.
Transfer the wire connectors from the terminals on the old timer to the matching terminals on the new timer.
Reinstall the control panel housing with the screws at the top of the panel to secure it.
Align the grooves on the timer knob with the timer post. Firmly press the knob onto the post.
Restore power to the washing machine.