Hynautic Hydrauliс Controls

SplashFl · Jul 23, 2025

mapism said: ↑

I'm pretty sure that this is possible also with Kobelt levers, because I've seen a sistership of my boat (which was normally powered by MAN mechanical engines, controlled by cable levers) where the first owner wanted electronic throttles instead, and the builder fitted the Kobelt, taking also the opportunity to install the backup cables+levers inside a cockpit locker, in order to make the boat maneuverable in emergency without having to stay inside the e/r.

Anyhow, I'm not surprised to hear that you managed to fix your Hynautic controls, because a boating mate of mine has them on his boat of the early 90s, and so far he only had a minor problem a few years ago, that a mechanic with specific experience managed to fix perfectly.
In fact, as he told me, most if not all the parts subject to wear are just generic hydraulic bits, relatively easy to source.
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The mechanic also told me the hydraulic system was actually very basic and he had access to parts at a local hydraulic supply. He also preferred hydraulic vs. electronic.

Capt Ralph · Jul 23, 2025

SplashFl said: ↑

The mechanic also told me the hydraulic system was actually very basic and he had access to parts at a local hydraulic supply. He also preferred hydraulic vs. electronic.
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Albeit a bit slow, they do still work and are still reliable.
If anybody was to ever document an O ring size list, The hynautic stuff could last forever.

Years ago I purchased up a pile of kits for my best customers. The next time I pull out a kit, I'll match them up and document the sizes,,, If I remember,,, Those slow brain cells are catching up some how..

mapism · Jul 24, 2025

SplashFl said: ↑

The mechanic also told me the hydraulic system was actually very basic and he had access to parts at a local hydraulic supply. He also preferred hydraulic vs. electronic.
Click to expand...

I sympathize with him. Actually, I prefer anything but electronic!
In fact, I just LOVE my very basic cable levers, because they are even simpler than the Hynautic system, which needs to convert hydraulic movements into push/pull cables anyway - albeit much shorter obviously, being inside the e/r.
I believe the main reason why some builders back in the days preferred those to cable levers was that with the latter it's practically impossible to fit a third station.
But also the nicer/smoother movement played a role, particularly on bigger boats.
Regardless, in your boots I'd stick to the system you've got for as long as possible - i.e., probably for a helluva lot of time!

SplashFl · Jul 31, 2025 at 2:05 AM

UPDATE. Will not know 100% until mechanic is all finished but he sounded very confident the problem are some old O rings and dirt in the fluid. Port side one in the actuator on about a 2" piston was sticking and some small ones in the charging valve below the fluid/air tank. Local supply only had one of the size needed for the piston but was available overnight.

Capt J · Jul 31, 2025 at 11:03 AM

Capt Ralph said: ↑

Albeit a bit slow, they do still work and are still reliable.
If anybody was to ever document an O ring size list, The hynautic stuff could last forever.

Years ago I purchased up a pile of kits for my best customers. The next time I pull out a kit, I'll match them up and document the sizes,,, If I remember,,, Those slow brain cells are catching up some how..
Click to expand...

It could but Hynautic doesn't support anything anymore and it's incredibly hard to find stuff, it is a reliable system.

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Hynautic Hydrauliс Controls

SplashFl Senior Member

Capt Ralph Senior Member

mapism Senior Member

SplashFl Senior Member

Capt J Senior Member