I recently bought a small farm in Oregon. The pastures, which had been ignored by the previous owner, have in places very large mounds. In some cases maybe 18" across and 8-10" high or more. I want to flatten out the pastures. I have tried a disc harrow that does not do much with this size humps and also a box cutter which does not work at all well in the irrigated pasture. So I tried my Kubota RGA1266 tiller set to the least tilling depth so it would just mow off the humps. It worked pretty well, but eventually I got caught up in some wire and sustained enough damage I had to send it to the shop. As I want to get the work done and soon it will start raining here and shut me down, I bought a 2nd tiller, a Land Pride RTA2072, which is supposed to be heavier duty, made for commercial use. After 8 hours the tines stopped spinning and on removing the gear case I found the gear shaft had sheared off completely (before the shear pin sheared on the PTO Shaft). I hadn't hit any stones or anything, although it's obviously bumpy work tilling over these humps. So question is whether I'm using these tillers for something I should not? Better suggestion to flatten it out without breaking a few $k implement every few hours?