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They had a post on this a while back, but here goes. The TO series was the precursor to the MH, which was followed by the MF's. Ferguson and Massey Harris were in the process of becoming Massey Ferguson while that series of machines was built, but those particular machines differ mostly in name and sheet metal than anywhere else. The 35 and 50 tractors were pretty similar. I think the 50's had heavier front ends but the rest of the machine was essentially the same. The gas ones had the Continental Z-134 engines, except maybe the TO was a Z-129. A I&T Manual, obtainable at most farm stores or from Central Tractor will tell all that. There was two modes to the PTO, engine and ground drive. Engine drive basically runs off the transmission countershaft and maxes out at a little over the standard 540 rpm, in CW direction looking at the shaft from the rear of the machine. Ground drive runs off the rear axle drive. It goes the same direction as engine drive when the tractor is moving forward, reverse when the tractor backs up. The speed is proportional to the ground speed. The original intent was to drive rakes and so on proportionally to travel speed. I've found it handy for helping unplug hay mowers...shift into ground drive and back up a foot or two..
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