I assume I have Hynautic steering as there is a cylindrical reservoir with a sight glass and pressure gauge. My question is where to add fluid? The bicycle valve is threaded into a large (7/8?) nut but that is all there is on the top. I tried loosening the nut and the valve but both were extremely tight and I stopped before I broke something as I did not have the correct sockets available only adjustable wrenches. The fluid is about half full and the pressure was at 15 psi.

I searched this forum and read a lot about the choice of fluid and was surprised to see in my Hatteras owners manual they advise ATF type A not the hydraulic fluids (Mil spec or Teleflex) that I have used in previous boats.

Paul
FREEWAY
48YF Oxnard CA