Various terms to cover various products. For what I've learned and remembered Live power indicated you could start and stop tractor ground movement with out stopping the PTO. This is real handy if you're baling, running a combine, corn picker or other type of harvester. Some of the early live power tractors simply added a clutch somewhere in the driveline after the PTO to allow starting and stopping but maybe not gear changes or even turning the PTO on or off without stopping the tractor. Some manufacturers came up with what is known as independent PTO meaning you can start or stop tractor ground speed with out effecting the PTO as well as turning on or off the PTO without effecting the ground speed. Or to put it another way the PTO and traction drives are completely separate or independent of each other. Another variation was the two stage clutch where the same pedal has two positions, one for the traction drive (usually 1/2 way) and another for everything (traction AND PTO all the way down). The two stage clutch seemed to be the way Ford and Massey Ferguson tended to do things, the only older Fords I ever saw with independent PTO were the old Select-O-Shifts. According to Tractor House data if you've got an 850 you have transmission or non-live/independent PTO. On that series the 820 had no PTO or 3 point ot Hydraulics, the 850 3 point, hydraulics & transmission PTO and the 860 3 point & live PTO (IIRC a dual clutch).
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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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