Locate the plastic belt cover on the front of the engine. With the engine off, remove the two screws, using a screwdriver. Lift the belt cover off with your fingers and set it aside.
Tip the snow thrower forward to gain access to the auger frame cover. Remove the six screws, using a screwdriver. Remove the frame cover, using your fingers.
Remove the front and rear auger belts off the drive pulley. Using your fingers, gently roll the belts up and over the pulley.
Locate the idler pulley for the drive belt. Lift the idler pulley up, using your fingers. Slip the driver belt over the idler pulley. Locate the stop bolt close to the auger pulley. Loosen the stop bolt with an adjustable wrench until the support bracket is touching the auger pulley. Slip the drive belt over the drive disc and remove it from the unit.
Install the new drive belt over the drive disc. Tighten the stop bolt, using an adjustable wrench. Life the idler pulley up, using your fingers. Slip the drive belt over the idler pulley. Install the front and rear auger belts over the drive pulley, using your fingers.
Install the frame cover. Tighten the six frame cover screws securely, using a screwdriver. Install the belt cover. Tighten the two belt cover screws, using a screwdriver.