I recently bought a Sr 928 28'' hi-vac. It worked great until one day it came to a complete stop and the clutch pedal hit the floor. I put the rider on its tail end and noticed a spring hanging. It attaches to a moving part connected to the clutch cable. I bought a new one and after about 20 minutes of mowing it snapped again in the same exact spot. It sheered of where it attaches under the engine. Both times it happened i was just mowing no shifting/braking was done when it snapped. What could be causing this? Springs are only $3. I suspect if i get another new one it is going to snap again. Any help is greatly appreciated.