My 1969 1850 apparently leaks hydraulic oil past the valve which in turn pressurizes the coupler ends. I find I have to use some sort of pin or bolt to remove the pressure before I can connect the coupler. Is there something that needs to be adjusted or do I have to tear into it and replace a valve. This tractor does not have the Hydra-electric couplers on it but I think those were replaced with standard Pioneer couplers at some point. I was going through the parts that were sent with the tractor when I purchased it last spring and there is a set of the hydra-electric couplers in the box. I can install the Pioneer couplers that will connect under pressure but the issue is the couplers leak out oil when they get under pressure. It also seems like both hoses are building pressure.