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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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