I was doing some brush clearing with my grapple and the battery indicator light came on. I stopped and everything looked ok with the battery and proceeded to head back to the house. About a minute or two later the engine heat light came on. I noticed that the fan belt was off. I shut it down and walked back to the house for lunch. An hour later I was able to get the belt back on but it was frayed with a string wrapped around the fan shaft. My question is how hard is it to replace a fan belt and did i likely do an damage to the engine?