Posted by IH fan on November 17, 2012 at 15:11:13 from (108.246.49.177):
In Reply to: IH hydraulics posted by Al L. in Wisc. on November 17, 2012 at 11:25:31:
hayfarmer said: (quoted from post at 14:25:31 11/17/12) I am more familiar with JD hydraulics but I have a SMTA also. JD went to the closed center hydraulics with New Generation tractors(mostly). Did IH change to closed center also and with what series of tractor?
I can't answer your question as to when/if IH changed, but a closed center system requires a pump that will drop to at, or near a no flow condition, generally just enough to allow a low sensing pressure. Most use a pressure or pressure/flow compensated pump which cams the swash plate of a piston pump back to neutral. Then when a valve is opened in the system, the swash plate is rotated or cammed to an angle to increase the flow. In a presure comp, it generally cams to a set angle, or all the way to a stop... in a p/f comp pump, the angle will vary according to how much the valve is opned. If anyone knows what type of pump is in their tractor, it should tell you if it's an open or closed system.
This post was edited by IH fan at 15:12:28 11/17/12.
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