Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Model number of the Cub Cadet? Does it have only one drive belt? Is the top pulley on the transmission spinning when engine is running?
So you replaced belt and fan. And You routed the belt per the instructions? Did you have either rear wheel off the mower, that may have lost axle key, if it has one.??
Will mower roll in freewheel ?
I suspect the belt is not tight to the transmission. The usual progression is the fan breaks and throws off the belt, It will not be the oil level!