No experience with the chopper, but I just want to reinforce the idea of either an independent PTO on the tractor or an overrunning clutch (on the chopper). The PTO will continue to drive the tractor until the machine stops. There is a lot of momentum in big machines like this. There is an old trick for disengaging the PTO--push in the cluch real quick while you flick the PTO out of gear, or blip the throttle closed while you try to unmesh the PTO gears--but that is very difficult with a big machine because it is putting a lot of pressure on the gears and they become very hard to disengage. The trick works pretty well with a rear-mounted mower or something without much momentum, but not at all well on machines like combines or choppers. Did a lot of combining with an F-20 and old-fashioned PTO, and sometimes it was possible to do the throttle-blip trick if the combine wasn't actually working, but if there was much going through the machine, the pressure on the tractor gears made disengaging the PTO really difficult.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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