First, you need to make sure you have the right tools for the job.
You'll need a wrench, work gloves, mower blade clamp, drain pan and
fresh fuel. Check your owner's manual for the correct belt to your
specific lawn mower. Belts that are not specifically designed for your
mower will not fit properly and may wear down prematurely.
Next, remove the spark plug wire. This is a safety precaution to
prevent the mower from accidentally starting.
Now you can remove the screws that secure the drive cover to the
mower deck. Once you've taken off the drive cover, loosen the screw that
holds the belt tension spring to the transmission. As the screw is
loosened, tension on the belt is released allowing you to remove the
belt off of the front transmission pulley.
At this point you'll need to turn your mower on its side to take off
the mower blade. Be sure to use a work glove to protect your hand when
removing the mower blade. You can use a lawn mower blade clamp
over the blade to secure it. Unscrew the bolt to remove the blade and
then the engine baffle. Once the pulley unit is exposed, you can remove
the entire drive belt. Insert the new drive belt and place one end on
the rear pulley and re-attach the engine baffle. Then, place the mower
blade back (making sure it's facing the correct way with bottom of the
blade facing the ground) and tighten the bolt. Remove the clamp and
return the mower to its upright position so you can place the other end
of the belt to the front pulley. Remember to tighten the screw to the
Put the front drive cover back on, tighten the screw that secures the
cover to the deck and reconnect the spark plug wire. Add new fuel to
your mower and you're done!