Well......It looks like it worked! I removed the oil tank, cleaned it out, installed a new filter, opened the hoses on the wheel motors, let the system drain, ran it for a very short time, re-connected the hoses and ran the tank return hose into a catch can. I wanted to be sure that any remaining water-fouled oil did not go back into the tank. After purging the air from the system and going through 8 quarts of oil, now only clean oil is being dumped back into the catch can. I'm going to go through a few more quarts just to be on the safe side. Lots of oil used but a lot cheaper than new pumps or motors!