Posted by IH fan on September 16, 2013 at 13:38:36 from (174.70.169.139):
In Reply to: Hydraulics.... posted by John M on September 16, 2013 at 11:47:30:
John M said: (quoted from post at 13:47:30 09/16/13) Thats he says in one of his problems, when he moves it lever to the center position, it drops all the way down, it wont hold anything up in that position, and says he cant control how far he needs to lift his cutter for like heavy spots. I havent heard back from him in the last little bit as to what hes going to do yet.
If I understand these old H and M systems right, with an auxiliary valve, the main hydraulic lever needs to be locked back in place to supply the aux. valve. Then if it's working the way you say, there is something wrong inside the valve, because it appears to be plumbed correctly. The one port being deadheaded will not make any difference, it will just dump over the main relief valve when the valve is operated in that direction. The aux. valve does not need a separate relief valve. However, for the 3 point to remain stationary in the center (neutral) position, the spool configuration needs to have the work (A&B) ports blocked in neutral. If it worked before and not now, it had the right spool. I agree that something is either leaking badly or broken inside the valve. The pump/relief valve on these old systems should not be capable of "breaking" the cast body of the aux. valve as the valve should be good for 2000psi or better, but it still appears something is broken in there.
This post was edited by IH fan at 13:39:43 09/16/13.
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