Hynautic Hydraulics--Help Needed

[27739]

Not new to boating, but this is my first hydraulic steering system. Hynautic H82 Helm with K6 cylinder on a 1991 Merc 150XR4 outboard. The system seems "notchy" and doesn't work very well. Many turns of the wheel to get any steering action. I've done several cable steering systems, rebuilt lower units, carburetors, trim/tilt units, etc. I'm not afraid to work on things, unle$$ there are a lot of $pecial tool$ involved. I have a couple of questions:

1) I assume that I'm due for a "purge" of the system (at a minimum). Can someone point me to the proper procedures to do this? Any hints or tricks to make the job go easier?

2) If the "purge" does not restore proper operation, is it viable to rebuild these units, or just better to replace? Do valves, etc tend to wear out, or just seals & gaskets? Can anyone point me to rebuild procedures and/or parts kits?

3) When functioning properly and turned to the "stops", is the wheel supposed to stop solidly (can't turn anymore), or should it be able to "notch" over?

Looking for all the help/advice I can get.

Thanks.

Terry

Thanks.

 

[F_R]

Re: Hynautic Hydraulics--Help Needed

First thing to do is make sure it is full of oil. The filler plug is at top of the helm. Use Teleflex/Morse oil, I suppose they probably have it here at iboats. Or it is ok to just top it off with Dexron ATF.

That may be all it needs. But if it does have to be purged, see those two bleeding nipples on one end of the cylinder? Connect them together with a piece of vinyl tubing. Then crack open the brass hex nuts about a turn or so and then just turn the wheel a whole bunch of times, keeping it full of oil while you do. Retighten the bleed fittings nuts and you are set to go.

The "notch" you feel while forcing it against hardover is normal to a limited amount. Each and every helm was tested at the factory to be in excess of 90% volumetricly efficient at 950PSI. It is the other 10% that allows the slippage or "notch" that you feel. It is impossible to make the pump 100% efficient and still be able to turn it. If it is real loosy-goosy, something is worn out.

 

[F_R]

Re: Hynautic Hydraulics--Help Needed

Forgot to say that Charman Enterprises is the nationwide distributor for Hynautic parts. charment.com Say Hi to Mike for me.

 

[Solittle]

Re: Hynautic Hydraulics--Help Needed

Google their web site for the how to do info.