Riding mowers operate with a deck beneath them. This deck holds the mower blades and attaches to the bottom of the tractor. The deck belt makes it possible for the blades to turn and the mower to function properly. Over time, the belt becomes stretched and worn or damaged. When your mower exhibits signs of wear, like slowing on hills, inspect the deck belt. Most mower manufacturers recommend the deck belt be replaced every two years, or more often if necessary.
Move the mower to a flat location. Engage the "Park" brake and remove the sparkplug wire from the sparkplug.
Raise the deck control switch to its highest setting and place a wood block under the deck on each side. Unscrew the bolts holding the deck in place on each side of the engine pulley, using a wrench, and remove the deck belt from the engine pulley. Unlatch the deck hanger links and remove the blocks of wood. Roll the deck from under the mower.
Inspect the deck belt's placement on the deck pulleys. The new belt must be installed in the same manner as the old one. Different models have a different pulley routing system.
Remove the deck belt and replace it with one of the same size. Route the belt around the pulleys in the same fashion as it was removed. Pull tightly to secure the belt around the last pulley. It will be a tight fit.
Slide the deck under the mower and lower the deck control to its lowest setting. Attach the deck hanger links and pull the deck belt around the engine pulley. Replace the removed bolts into the deck with the wrench and raise the deck setting. Reattach the sparkplug wire to the sparkplug and start the mower.