From what you are saying, having changed hoses from a cylinder that works good on the other outlet it leaves only two things I can think of. One of course is the valve spool itself. The other is, do you have a check valve bolted to the bottom of that valve and are the hoses running off that check valve. It was common practice around here to add that check valve to hold heavy loads from creeping down or even up when down pressure was needed for an implement. If the o-ring in there is shot, you will leak down and also have less pressure and flow from that valve. You also said short lever is the one you use. I take it you mean the shorter of the two for aux valves and not the shortest one on the right hand side which is for the fast hitch . Also, checking cylinders for internal leakage gets to be controversial. If you have a double action cyl leaking down and the cyl is hooked so the rod retracts into the cyl when it goes down, you in essence have only the area of the rod holding the load, pressure builds and equalizes on both ends of the cyl and will build to approx six times normal pressure and even a good valve will not hold. So many say to check for leakage , just unhook both hoses and if it holds the load up the cyl is ok. Not true, when that rod goes into the cyl as it leaks down oil is displacled. It cannot go to the other side of the cyl as the rod is coming into cyl . No different than filling a glass with water right to the brim and then inserting your finger into the glass of water. It runs over. If you have a cyl that the oil cannot leak to the outside, where is that oil to go. No place so therefore dia of the rod is actually holding the load. It is pretty easy to prove by drilling a hole in the piston to allow oil to flow to both side in cyl, lift a load , will probably need outside help to lift with that much leakage, and then unhook the hoses. It will hold that load forever or until it blows the hoses depending on weight of load. This is one reason John Deere had relief valves in their hyd cylinders as their hyd vaves sealed positive, no leak down. A leaking piston seal could cause hoses or cyl to blow, and or sitting in hot sun did same thing. Now on a cyl, like often used on the bucket of a loader , where the rod actually comes out of the cyl when it leaks down you have a completely different situation. Disconecting and opening hoses to isolate cyl is necessary on those. On a regular double action cyl, rod retracting when leaking down, you leave hose that is holding load connected, unplug other hose and if coupler gets tight you have a leak in cyl. Actually, you don't even have to unhook from coupler, one hose should be free, loose, if cyl is good.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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