Leaking hydraulic oil started to come out the valve block so tightened it up to stop leak but when boom goes up it creeps back down maybe it could be spring or ball check valve? Any ideas on what this could be
I think you have an adjustable orifice slow return check valve and while stopping the leak you have adjusted it too tight. Try to adjust it the other way and still have it not leak. Later Bob
if I adjust it the other way it will just come out even more :/