Park the MTD riding mower on a firm, level surface. Turn the engine off, set the hand brake and remove the ignition key.
Remove the hubcap from the wheel by placing the tip of a flathead screwdriver where the cap edge meets the wheel and prying up.
Loosen the exposed bolt at the center of the wheel using an adjustable wrench. Turn the bolt approximately 1/2-turn counterclockwise. Do not yet remove the bolt.
Raise the rear wheel of the mower a few inches by placing a jack under the axle casing close to the wheel. Place a jack stand next to the jack for added support and safety.
Remove the rear wheel from the axle by pulling it straight off.