Guys, thanks for all the help and suggestions. YOU stopped me from buying $500 worth of loader valve. YOU made me check things I didn't think of. A few of you suggested the quick connectors. I just bought and swapped them in December cause my originals were leaking. I replaced almost all of the hoses as well. Things were ok until I bumped the bucket into a snow pile at almost full dump position. At that point I "believe" it back pressure shocked the quick coupler and turned it into a one way valve. I changed the couplers a few nights ago for a set of American Made Summit Hydraulics with a warranty. More than a hundred scoops of snow later....working flawlessly like it has since 1996. the cheap chinese coupler springs are weak and in one the valve will not return on it's own. I can blow thru one way fairly well but struggle to blow thru the other direction. that was enough evidence or me to swap an original coupler "leaker" onto the system and try it. the problem with curling the bucket went away. I did not change the boom couplers and had troubles raising the boom at one point. I dont see evidence of failure in those couplers other than weak springs. At any rate, I now have -8 "Tees' I made and gauges etc. but I'm not sure I need to pursue this unless another problem pops up. Just here to thank ALL of you for helping me.