Hi Tim, welcome to Outdoorking. There seem to be three ways for us to help you solve your problem: find a manual for a King Cat Leopard, find someone who is familiar with the model, or sort it out from first principles. I don't see any King Cat manuals in the manuals section of this site, and I haven't found one on the internet either, but someone else may. If we have to go to first principles, it will involve you posting a lot of detailed photographs of the various parts of your mower's drive train. (At first glance, because you have said it does not have a belt-tightening clutch system, it sounds as if there is a mechanical clutch in the system somewhere, and it either needs adjusting or new parts, but that could be completely wrong: it may have a hydrostatic transmission, which either has low fluid level or is worn out.)
Let's see if someone has either a manual or experience with the model, before we try doing it the hard way. Meanwhile though, if you post a few basic pictures showing the transmission and the clutch linkage, it would help make this thread more useful to others in the future.
