I went through this machine, it was driving when I got it, other than the flat tires. I changed the oil, hydraulic filter and put hoses onto the connections for the reels. I figured out how to get the hydraulics to come on and everything seems to work. The John deere is 2wd with a wide front axle. The engine is a 39 hp diesel, 3TNV84T
Here is the Jacobson HR5111, it has a kubota V2203 rated at 49 hp. I'm using the original JD hydraulics, so I don't think it will overload the engine. The hydraulic flow for the original reels is manualy adjustable. If the Jacobson decks bog the engine down I can throttle the flow till it keeps up.