Park the Sears Craftsman lawn mower on a level surface. Set the parking brake.
Place a wood block behind the tires on the side that is not being worked on.
Place the jack under the axle closest to the tire being changed. Lift the jack until the tire is not touching the ground.
Unscrew the axle cover in the center of the tire. Pull the retaining ring and washer off the axle.
Pull the wheel off the axle.
Slide the new wheel onto the axle. Install the washers and retaining ring. Replace the axle cover. Tighten the axle cover with the screwdriver.
Repeat the process for any additional tires to be changed.