Per my Hynautics Manual, "...the resovoir stores approximately 2 quarts of hydraulic fluid under a pressure of 20 psi.". Purging system, "...use ATF Type "A" (its an old manual from the early 70's) or MIL SPEC MIL-0-5606 Aircraft Hydraulic Fluid...". "The resovoir is fitted with a 10 micron filter (never knew that)...". Fill to within 3" from top of the sight glass...and... pump the resovoir to 20-30psi.
I myself keep it at 30psi. It never lose pressure or fluid, since I had my flybridge unit send into Hynautic and rebuilt. Before that was leaking over the topsides.
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Thread: Lost steering on flybridge
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Re: Lost steering on flybridge
50 Years on the Great Lakes...