Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Which belt is coming off the transmissions drive belt or the deck belt? Are the belt guides in place and adjusted so the belt can't come out?
With engine OFF, is the belt tight? The tension spring has to keep the belt tight!
With engine running, is the belt bouncing around? Sounds like the belt is not on properly. You say you replaced the belt and the clutch? Clutch is for the deck,???
Where is the front drive pulleys belt guide? Is it there. The belt should not change its route or load when you move the levers !