Gordon, thanks for replying. I will answer on the BB in case anyone has the same problem.
I just had a hole welded in the PS resevoir and filled it with fluid. The PS was working fine for about 20 hours and died fast in about 15 minutes after which I filled the resevoir to the top just in case it was the fluid. It is very hard, almost impossible to steer in either direction unless I lift the front end up with the loader. I have 4000lbs of counterweights on the back end so there isn't too much weight on the front.
Does this help?