I use my 7' Rhino for the same purpose. It has a clutch in it so you really can't hurt it or the PTO. But you should follow the rules in the Owner's Manual... 2" diameter trees are all you can cut safely. Further, you really don't want to be pushing trees over with a tractor: First, you have tractor, not a dozer. Besides, you really should be backing the cutter into heavy trees. It's much easier and safer and you get better results. Second, logging stubble is very sharp. You'll want some www.ultraseal.com in your tires. www.gemplers.com sells it. Fixing flats in the forest isn't my idea of a good time. Keeping the rears very soft, just "up", is the best way to go. Third, forgive me for being blunt but you bought the wrong size cutter. The cutter should be about the same width as the rears. A 7' or 8' cutter is just right for the size tractor you have. The reason is that as you back into the trees, you must cut a path wide enough for the tractor. If you want to build roads (I do that too), get a 3 pt box blade and a loader. If you want to clear land, find a neighbor with a dozer.
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