We had a Gravely 2 wheel tractor growing up on my Grandparents farm. It had the Gravely engine (vs Kohler) and was a good machine. It had a 30 inch bush hog deck and a front cultivator - which I never saw used. To start the engine, you had to wrap a rope around a pulley and give it a pull. If you had to much wrap and the engine kicked-back, it could be a painful experience. It took a really hard jerk to get the tractor to start.
There was a belt from the pulley to something on the engine - perhaps a generator? The belt went vertical on the rear face of the engine. I had an uncle tinkering with the tractor and managed to get his finger in the belt and it took a 180 degree ride around the pulley - beneath the belt. It didn't wack off his finger as the belt was forever loose, but it did bloody it up. My Grandmother was at the farm house and my uncle shouted he needed a large rag to put on his finger ASAP. My Grandmother said all she had that was clean and white was a bed spread - but she didn't want to get blood on it - LOL!!! Sometimes I think there could have been a reality show on that farm from time to time!
I've got an 8 hp Gravely 2 wheel tractor. The engine is a Kohler and is about a 1982 model. It has a 30 inch bush hog, riding sulky, rotary plow and rotary cultivator. It's a great tractor, but it really takes a young man to handle it.
I've used moldboard plows on garden tractors, have an use a Troybilt Horse tiller and my Dad has a very nice, large BCS tiller. All of these do a nice job turning/working the ground in the spring - but none hold a candle to the rotary plow on the Gravely. Don't know if anyone has ever run one of these rotary plow, but they shread the toughest of sod. Just don't have your body between the hand rails if you hit a large rock, else the Gravely will whip sideways and try to knock you over!
I've never been there, but I'm pretty sure Gravely tractors were originally made in Dunmore West Virginia - within a couple of hours striking distance from my neck of the woods. I think Studebaker bought them somewhere along the way. I still see a fair amount of these 2 (and 4) wheel tractors around these parts.