Lower the Cub Cadet mower deck to the ground by adjusting the height control lever. Place blocks of wood under the deck if it does not lower fully to the ground so it is supported for removal of the locking pins.
Locate the pins holding the deck to the frame, and use pliers to pull the cotter keys from the pins. Lightly tap the pins with a hammer to remove them and place both the pins aside. Slide the deck out from under the mower and store it.
Position the frame for the snow plow under the mower frame and align the holes in the plow frame with the holes in the mower frame. Slip the pins back through the holes and lock them in place with the cotter keys.
Maneuver the snow-plow blade so it is in front of the mower and the mounting holes are near those in the mounting bracket. Have an assistant help lift and hold the blade in place while you slide the blade mounting pin through the holes. Lock the pin using by inserting the cotter key through the pin.
Adjust the handle that controls the raising and lowering of the blade. This is the same handle the controlled the height of the mower deck originally. Choose a height approximately 1/2-inch from the ground and lock the handle into position.