It is important to take proper care of the blades on your Craftsman garden tractor, to ensure smooth, even cutting of your lawn. Blades should be sharpened on a regular basis and replaced when bent, rusted or damaged. Using bent or damaged blades will damage the mower deck and could possibly cause injury. Remove damaged blades and take them to an authorized dealer for sharpening and replacement.
Park your garden tractor on a smooth, level surface. Engage the parking brake, turn the engine off and remove the key. Disengage the blades and raise the mower deck to its highest level. Disconnect the spark plug wire and place it so that it will not touch the spark plug.
Remove the hex bolt that holds the blade in place using a 3/8 inch wrench. Remove the lock washer and flat washer. Slide the blade off the mandrel assembly (pulley that is connected by a belt to the engine pulley causing the blades to spin).
Place the lock washer and then the flat washer on the hex bolt. Line the hole in the center of the new blade up with the bottom of the mandrel assembly. Insert the hex bolt into the mandrel assembly and tighten securely.