Need help replacing a JD 850 SCV

ceb5

Member
I'am replacing the SCV on a 850 with P/S. From what I have seen this valve is no longer available and if you do find one it is expensive. The one that I am working on has a valve that is wore out. I would like to replace it with https://www.surpluscenter.com/Hyd...PACT-10-GPM-JOYSTICK-CONTROL-VALVE-9-7401.axd
The problem is the three lines going to the valve. I know that one is the in, 1 is the out and the third one is a BYD which I do not know what that is. Any help would be appreciated in how to plumb this valve
 
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