Push the snow blower onto a level surface, if you do not already have it on one.
Lift up one side of the machine at the base with the assistance of a friend. Alternatively, use a car jack to lift one side.
Slide a wood block under the raised side of the snow blower. This will help keep the machine propped up so that you have easy access to the tire on that side. If you are using a car jack, you do not need the wood block.
Push the pin clip so that you can pull the pin out of the axle. One pushed, pull on the pin to remove it from the axle.
Pull the wheel off the axle. Once you have the first wheel off, you can lower that side and repeat the process for the other side.