If you are mowing with your Snapper riding lawn mower and the blades stop turning when the deck is engaged, the drive belt has most likely snapped or is stretched out and is not spinning the deck pulley. Replacing the Snapper belts can easily be done right out on your lawn.
Park your Snapper riding lawn mower and shut it off. Disengage the deck lever.
Pull the spark plug cap off the engine to prevent accidental starts while you were working on the mower.
Loosen the four bolts holding the case over the deck pulley--it has the deck engage/disengage lever on it. Use a 1/2-inch wrench to remove the bolts. Lift the case off to expose the deck pulley.
Loosen the three belt containment pins surrounding the deck pulley with a 7/16-inch wrench. Slip the belt off the deck pulley.
Loosen the three belt containment pins surrounding the pulley under the engine with a 7/16-inch wrench. Slip the belt off the engine pulley. Slip the new belt on with the V-belt edge of the belt facing the groove of the pulley. Tighten the three belt containment pins back in around the pulley.
Slip the new belt on the deck pulley. Tighten the three belt containment pins back in around the pulley.
Tighten the case back over the deck pulley. Put the spark plug cap back on the spark plug.