The throttle cable on your cub cadet takes a lot of abuse, especially for those with smaller yards or who live near a busy street and have to make a lot of speed changes. Cub Cadet throttle cables are pretty well made but they do break from time to time. If this happens to you, don't worry, replacements can be found online for under $10.
Replacing the cable is also a very easy job. You just remove the old cable and replace it with the new one. Installation should take less than 10 minutes if you have the right part.