Small Engine Troubleshooting Problems? Ask a Mechanic Now.
See link above # 44 and # 54 are belt guides and guards, that keep the belt on. There is also belt guide at the drive pulley on the engine. Are guides in place and close enough to the pulleys to keep belt from coming out? Can you determine which pulley belt is coming off of?
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# 48 is the engine pulley belt guide. see link above.
While belt is off, check the spindles and pulleys to be sure you don't have a bad bearing.
Have you replaced the belt? Once a belt is twisted, it will never stay on. Do you know which pulley is belt coming off of?
Idler pulley has belt guide that should be tight enough to the pulley to keep belt from coming out, or it needs to be adjusted, the end pulley uses the outside housing as belt guard, are they in place?
?? With new belt be sure the guides are so close to the pulley that the belt can't come out, without moving the guides!