I had to fill and bleed my hydraulic steering system. My 1988 32' system has a hynautic two helm system. All of the bleeding instructions I found on-line were slightly off because there are several types of systems. I found the real information printed on the side of the reservoir which is under the cockpit. I had to stick a camera down there and take enough pictures until I could piece together all the text. Hynautic has changed hands several times. If this is your system here are the bleeding instructions.
SYSTEM PURGING INSTRUCTIONS (From side of reservoir unit)
1. Fill reservoir to within 2” of the top. Pressurize to 30-40 PSI.
2. Loosen valve screws on relief valve under reservoir.
3. Using bleeder screws or cylinder fittings bleed both ends of cylinder until solid oil appears.
4. Go to highest helm and turn slowly 40 time in one direction
Repeat in the same direction at each successively lower stations.
5. Again bleed at cylinder as in Step 3.
6. Go to top station and turn slowly 40 time in the opposite direction. Repeat in the same direction at
successively lower stations.
7. Again bleed at cylinder as in Step 3
.
8. Purging should be complete at this time.
9. Close valve screws on relief valve. Check turns H.O. to H.O. from owners manual.
No manual- mine was 4 and 1/2 turns
10. Leave system pressure at 25-30 PSI, and top off the reservoir half full.
I didn't have to rebuild my unit but I did find a lot of information on this site. What you do all depends on what kind of steering unit you have.
http://www.boatered.com/...opic.asp?TOPIC_ID=138635