Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
See page 14 of this link. The belt goes around both of the pulleys on the blade spindles. The belt then comes across the deck around goes around the inside of both idler pulleys and then up to the engine pulley. It will be routed just like the belt is shown. Just remember that the backside of the belt rides on the two idler pulleys towards the middle of the deck.