That's a really nice clean instalation. I have thought about plumbing my PS from the loader pump, but I would need a priority valve that can handle the total flow from the bigger loader pump and I am not sure how big it is. The loader operates plenty fast even when idled down, but the PFDV would still need to handle the total flow when the engine is at full throttle, which may be as much as 25 gpm or so... it's more pump than the loader really needs.
Dad had a JD 60 with a CharLynn PS and it had a Saginaw (division of GM) pump that looked identical to the one in my 1955 Oldsmobile. PS was installed in the 1953 60 in the fall of 1958 when Dad bought it and a new 227 corn picker. Later after I left home for the service in '61 Dad sold it to his brother and about 10 years later I saw it and the Saginaw pump had been removed and the PS was plumbed into the tractor pump. By this time, I was working for a hydraulics manufacturer and noticed these things. Guess the pump went bad and rather than replace it, they just re-plumbed it. The drawback at the time was that the tractor pump on those JDs had a dis-connect so you did not have to run the pump if you did not need it. If you used it for the PS, you had to leave the pump engaged.
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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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