You can't plumb into the "input" side and make it work, because it's an "open center" system, meaning when the valve spools are centered, the oil is constantly flowing through the valve from pump to sump. There is virtually no pressure on the input port until you move a valve spool to push a cylinder ram. The "power beyond" option takes the return port and allows any unused flow to be used on any remaining open center valve spools in the system, such as your fast hitch. This is called a series connection. Trying to put two open center valves in parallel won't allow either to work, as there will always be a loop flowing to the tank from one or both valve blocks.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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