966 steers slow to the right

I just bought a 966C that steers slow to the right, works fine to the left but is slow turning to the right. It does not make a diffrence if you rev it faster, doesn't labor the engine, almost seems like the valve is not opening enough. I talked to a couple people, one suggested the snubber valve may be stuck, sounded like a great idea, but this machine does not have one. Looking for ideas on what it could be. I am in the process of changing the fulids, hydraulic oil was milky, most likely water in it. Machine is s/n 76J9076

966 steers slow to the right