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hydraulic O rings?

O

old-9

Well-known Member
I am trying to install a hydraulic top link on my NAA . Am having trouble getting the valve to seal onto my tractor. It fits but seems like the o rings leak and the piston on the top link cylinder leaks back.
Does anyone have a part number or size for the " quad" rings to fit this valve? I am getting good at taking the valve off and reinstalling it.
Thanks for your help, joe
 
New cylinder and new to me valve. I also took the valve to a good hydraulic repair place. At first the cylinder would go to full extension or to full retraction and when valve returned to neutral, cylinder would return to no load. Whatever if extended , would settle till implement was on ground. I removed valve and changed o rings and then cylinder would hold position but only in one direction.
Valve is real fun to R&R so wanted the right quad o rings. My parts book doesent show the optional valves. thanks for your help. joe
 
If the spool or housing is pitted pr the orings don't fit correctly, then yeah, I agree its gonna leak down. Almost sounds like time for a 2nd valve, cheap oc logsplitter plumbed in, fed from that one. Let the cheapy ls valve wrangle with the toplink.
Tie the other valve open as a source.
 
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