Bill, The seals in your control valve only control external fluid leakage. I would suspect an issue with your quick disconnects. With tractor not running, disconnect and reconnect disconnects. Bob
Thank you Bob - This is a big help.Hmm, Let me first say I'm not at all familiar with the 2305 or the 260! BUT, I am familiar with hydraulic systems in general.
So! If everything works as it should when the hoses are connected to the 3-pt, that means nothing is wrong with the hoses or disconnects...possibly. I'd try one more thing. Tractor not running, loosen the disconnect on the tractor side of the return line from backhoe valve... not sure which hose that would be, but typically the line with the male connector on the hose. Start tractor and I would think you should have a good leak at that fitting. If so, that guarantees the disconnects are OK. That only leaves the linkage and the 2 relief valves. I can't figure out the linkage from the part catalog, but I'll suggest trying to open one up to determine if the spools are actually moving. I find it hard to believe that all 6 spools stopped working at once, but who knows! The only other item would be the 2 relief valves. Contact your dealer and ask if he can test the relief valves... when removed.
'Bout all I can think of. Sorry I can't be more specific. Bob