I'm pretty sure this is a pilot operated check valve. the only thing that makes sense. doesn't seem to be a relief valve Won't know for sure until I can pick up a pressure gage & install it on the hyd pump so I can monitor the pressure. If thats the case, it either stock partially open or I'm definitely blowing by the piston. I'll have to machine a test block to take it out of the system so I can do a proper pressure test of the cylinder.
[Linked Image from live.staticflickr.com]


I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.