So i'm the next guy with a hydraulic steering install problem. Putting add-on steering system on ('88 fountain with twin TRS). Everything bolted up and plumbed fine. Connected one end of one ram to the opposite end of the opposite ram, teed each set to the original control valve on the transom, at the end of the valve. Removed the brake line type hoses that connect the valve to the old ram on the transom. Problem is, when you turn the wheel, it takes off and goes to full lock, and there's no stopping it. The only way to get it to go back the other way is to turn the wheel the same way. For example, when I turn the wheel left, the whole system turns left and locks there. only way to get it to go right is to bump the wheel LEFT, then it takes off to the right till it locks. And so on. Did this a bunch of times hoping it was air, but it's not making any difference. Gotta be something stupid.
Also I used the boat with the stock steering system last week, everything worked fine so the valve should be ok.