I copy/pasted the bleeding instructions from a circa 1980s Hynautic manual for the systems that have the pressurized resevoir (accumulator). Hope this helps.
1. Loosen two purging screws. Back off by hand, counterclockwise, until they stop. DO NOT FORCE
2. Fill reservoir 3/4 full
3. Slowly pressurize to 35-40 psi
4. On Bridge, bleed air out of Port & Starboard lines, one at a time. Re-tighten. Check levels, re-pressurize to 35-40 psi.
5. Steps 6-9 can be accomplished (turning wheel 40 times in one directions because the two purging screws are open).
6. On Bridge, turn wheel to port, SLOWLY, 40 times, 2-3 seconds per revolution. Check levels, re-pressurize to 35-40 psi.
7. At lower helm, turn wheel to port, SLOWLY, same as #5 . Check levels, re-pressurize to 35-40 psi.
8. Return to Bridge, same procedure to starboard, SLOWLY. Check levels, re-pressurize to 35-40 psi.
9. At lower helm, same procedure to starboard, SLOWLY. Check levels, re-pressurize to 35-40 psi.
10. At steering cylinder, bleed both ends by (a) back off the socket head cap screw bleeders one turn, let air escape, tighten; OR (b) open the hose fitting connections one at a time.
11. Close the two relief valves by hand, snug with a wrench.
12. Refill reservoir, adjust pressure to 25-30 psi
13. The following fluids can be used: Hynautic Steering Fluid MCO-06 ; Dextron 3 Automatic Transmission Fluid; Aircraft Hydraulic Fluid.