- 1). Locate the transmission cover. It is a black box that protrudes upward from the mower deck. Remove the screws that hold the cover onto the deck with a screwdriver and then remove the cover from the deck.
- 2). Grip the belt with one hand and turn the setscrew located next to the pulley on the transmission with a screwdriver until the belt is loose enough to pull from the pulley.
- 3). Place the Lawn-Boy L21ZSNC on its side so the air cleaner faces upward.
- 4). Pull the loose belt off the pulley located on the mainshaft of the engine and then discard the belt.
- 5). Place the new belt onto the pulley and then stretch the belt though the small hole in the mower deck that allows access to the transmission.
- 6). Place the belt on the transmission and hold it in place. Tighten the screw until the belt is tight.
- 7). Place the cover onto the top of the Lawn-Boy L21ZSNC mower deck and secure it with the screws.
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