Posted by charlieu on November 17, 2012 at 18:48:45 from (209.131.227.57):
In Reply to: IH hydraulics posted by hayfarmer on November 17, 2012 at 11:25:31:
Most people do not relize it but, the 300/350-400/450 460-560 series of tractors used (Hydro-touch) close center hydraulic valves. There are also others that used this system.
That is why so many people have trouble with the pressure regulator valve with the little orfice with the screen on it that likes to plug up. Oil flowing through this orfice is actually used to open the dump valve that opens up to allow pressureized oil to flow back to the reservoir when the hydraulic valves were returned to netural.
Red power magazine did a story on this hydraulic system a number of years ago. They explained it very well. I wish somebody would do a story on how the power steering was added to the hydro touch system explaining in detail how all the valves work.
I will have to look back in some of the old magazine to see if I can find the story that the Tractor DR. did. I hope this helps. charlie
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