Originally Posted by Pascal
what steering system do yuou have? If hynautics, like most hatts of that vintage, you should have a reservoir, usually in the engine room. You refill the system there, add some air (about 20psi using a hand pump). Turn the lowest helm one way until you build pressure and get to the stop. turn the other way till it stops. it can be as many as 50 turns... repeat and the highest helm and you should be done.
If air got in the system near the rams, you may need to bleed at the rams.
there was a thread on that on the hatterasowners.com forum a couple of weeks ago.
The easiest way to do it is to just add fluid, pump up the system, then crack the lines on the tower and let the air bleed out until you have fluid. Air always rises to the top of the system.