Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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There are two belts that operate the transmission drive on your machine. One that runs from the engine to the back of the mower which goes to a variable speed pulley, the second from the variable speed pulley to the transmission. The rear belt has a spring loaded idler pulley on it, I would check this spring, if it comes off or breaks it will allow the rear belt to become loose. By spinning the pulleys by hand you may get enough movement out of the variable speed pulley to allow the machine to work for a little while but eventually it will quit again because there is not enough tension on the rear belt to make the drive system work properly.