I've got a 3320 and the JD 655 tiller. It has a self tensioning chain on the side. I used it this past weekend for the first time on some sloped rocky soil. Worked great . . . even up hill. The only time it bogged was when I hit a quite solid and hidden oak stump. It bent two tines and jammed the tiller. Although the tiller's clutch did work as intended, it smoothly killed the engine, likely because I'm at the low end of the required hp range. It happened slowly enough that I could have prevented the engine from dying by turning off the PTO had I not been so distracted (unfortunately, not by the neighbor's wife). I used my 3ph log splitter (with the knife removed) to bend the tines back into shape. Otherwise, I could run it as deep as it would go and only noticed a slight load on the engine during sharp turns. I was in A range and running the pto at 540 rpm somewhere between .5 and 1.5 mph. The 655 weighs about 500 lbs. The 3320 didn't seem to even notice that it was there. I used the 655 with my 300cx loader on (HD bucket). Most of the time my bucket was carrying a load of rocks I picked up along the way. With iMatch, and no loader, the tiller calls for 2 front weights I believe. Without iMatch it only calls for 1. I don't know if that's considering loaded front tires. All my tires are loaded with RimGuard. By the way, this was unbroken ground with the exception that I ran across it a couple times with the scarifiers of my box blade engaged in the soil to pop out or at least discover and manually remove the larger rocks before tilling. 655 says it's made in Italy. So far I'm very pleased. I think the Frontier would be quite similar. Oh yeah. . . and afterwards I took care of that pesky stump with the 448. It was a fighter. It was a great weekend.
