Just found a parts manual online for your machine. I didn"t see the relief valves you were looking for, but the pressures you give for them being around 1000 psi seems way too low for the actual port reliefs for the various functions. Usually the pressures on these machines is closer to 2500 psi. That said, take a look at the parts book at the link. I don"t know what your serial number is, but take a look at the picture and parts list on pages 25-26. According to the parts sheet number 14 is a relief valve tube. I"m assuming that means there is a relief valve either in that tube or attached somehow to that tube. On the roll forward side it looks like the relief is part number 5.
I work on equipment like this for a living and to me, like I said, the reliefs in the circuit your talking about seem to have way too low of a pressure setting to effect the function your having problems with. Beyond that the only other suggestion I can give is to start at the cylinder and tee into the line and check pressures there. If it"s high enough then backtrack the system and check it at ever point possible until you find the problem. You should find that the hoses going to the cylinders on both sides eventually Tee back together and have only one port off the valve. Somewhere between the valve and the cylinder should be a port relief that acts to dump pressure even if the valve is in the closed position. In other words if you can tee in directly at the valve port and get high pressure, and aren't getting it at the cylinder, that will help pinpoint the problem.
Wish I could help out more but it"s hard to troubleshoot something like this without actually having the machine in front of me. That said, now that I"ve got a parts diagram in front of me it makes things a lot easier. If you run into any more problems and can possibly post pics of the part/area your checking it will make things a lot easier.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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