Almost all tractors in US made after approximately 1980 have speed control on the hydraulics. It is called pressure flow compensated system. Even John Deere went to that system. The one they had since the 4010 was a one of a kind system and you could literally tap into any pressure line ahead of the SCV's and take any amount of oil you want up to capacity. It wasn't a perfect system either as we made real good money in the shop repairing those SCV's on a regular basis and the place they put the pump was just plain miserable for simple jobs up front. Also, hard to feather a touchy load and that is big reason you always saw spool valves on other tractors and earth moving equipment.
I made a lot of orfices to control flow. They were however usually for a drop of a load or header. A 1/4th inch slice of a steel bolt or shaft, small hole and slotted on one side to permit full flow one direction and restricted flow in other. I does require operating lever being held while working against the orfice and relief valve will operate as will any adjustable orfice unless you can use float in that direction like dropping a header.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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