Hynautic Hydrauliс Controls

I have single station Hynautic controls on my 95 vintage Viking. Mine got stiffer over time. I contemplated switching to electric controls and decided against that for a couple of reasons. I then committed to a rebuild of the Hynautic controls. The fluid came out black. The components were sent out for rebuilding. I am really pleased with the results. The controls are much easier to move. I can do both controls with one hand now which aids when docking is challenging. Let me know if you want me to dig up the contact info on who rebuilt them. The guy was in Stuart. There is another guy on the west coast that I worked with on another Hynautic matter and I was really pleased with him as well. He specializes in Hynautics.

I don’t know the name of his business but his name is Wayne Peyton. He is an excellent mechanic and honest to boot. Not cheap but the good ones aren’t. I will private message you with his phone number.

Pm sent

Usually port & stb are on their own system, Same for you?
Different feel from port to stb controls?

Of all the Hynautic controls I have ever operated, None were ever easy to push. The more in a hurry you are, the harder they feel.
But just leaning on them a little will make them move.

Over time, the bottom of the lines get dark/dirty.
I reclaim the fluid and this dark will filter out.
Always assumed old rubber and tarnish.
The last time I ordered the original Hynautic fluid was near 3 years ago, was over 2 weeks to get in, I believe it was the last gallon in Dumbetic inventory.
I've reclaimed every drop since then.

Now everybody is just using cheap glycol.
I was told once, more glycol than water will help. Coolant is thinner than water.

The bottom of your reservoir may have a big nut with a return line to it.
Inside of it may be a rock type filter.
This was an issue on old Hynautic steering systems but the control systems has very little return flow, not a part of the push/pull of operating the slave-servos.

Correct.

If it is dark, somebody added AFT. With a spin on filter, you have/had the old power-assist setup.
Hopefully with the later cylinder system.

I ah ent used by auric engine controls in years but they don’t use ATF or hydraulic fluid. I can’t remember for sure but I believe they use single grade engine oil, don’t they ?

The original part number was HA5455 for the filtered fluid.
I don't think it is available any more or rudely expensive.

The spin on filter was used on the power assist system.
When I disabled past power assisted systems, I leave these filters in line also.
If your filter was under pressure, then yours was still in the system.
No pressure, was just left behind.

I'm not sure of the viscosity between ATF and the factory recommended hydraulic steering fluid. I don't think enough to worry about.
Just IMO, stay with the factory specs when I can. If working now, don't touch.

One bottle should be enough.
Keep the old stuff and filter it clean.
https://www.westmarine.com/seastar-...id-for-engine-controls-1-gallon-14660948.html

Does your steering system look like this?

I remember working on one control system long ago, The compression fittings on the tube ends were tightened down to much restricting the flow a good bit.
If your going to take the system down, Check all tubing ends.
Oh, label the tubing ends well.