Been following your saga for some time as I have a 504 which I recently put P/S on. Agree with Allan about placing power beyond valve between P/S flow divider and aux valves. You will indeed need a return to sump for the power beyond. Only place I know of that is big enough to dump that much oil is the filler plug without tapping another hole in the xmsn case. I don't think the 1/2 inch pipe plug that is the fluid level check/power steering/oil cooler return will be big enough to flow what you need. You have the 17GPM pump if I recall correctly.
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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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