Just found out a seal in my Hynautic let go and there was steering fluid all over. The clean up took longer than the install of the seal kit.
I had and H20 series Hynautic but I wasn't sure which one. I found out only by removing the steering pump and cleaning it up that the model number is on the unit. It's and H-25 S with a serial number after it. Don't know what the S is or what the serial number is but the seal kit is HS-02.
There is a youtube video for this model which was ok, it helped me figure out which way one of the o-rings goes. Took my time and it all worked out.
https://www.youtube.com/watch?v=6ZMChOzjUiw
$39 for the seal kit.
Just need to bleed it. Does anyone know if you open the two brass hex nuts below the reservoir, does fluid drain from there at all? Not sure if I need a bucket under there or not.
Hynautic Seal Kit Change for 12 Meter
Moderators: BeaconMarineBob, Moderator, BeaconMarineDon
Hynautic Seal Kit Change for 12 Meter
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1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP
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- Location: Lower Chesapeake Bay ,Va
Re: Hynautic Seal Kit Change for 12 Meter
Fluid may leal from them when lose but it does not come out per say . I put a oil absorbent towel under it .
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat

Re: Hynautic Seal Kit Change for 12 Meter
There are usually bleeder fittings on the steering ram or just turn the wheel back and forth several times and it will bleed on its own.
She was a 1969 36 ft wooden beauty with big blue 440s that we'll miss forever.
And thanks to the gang, 2012 Trojan Boater Of The Year
And thanks to the gang, 2012 Trojan Boater Of The Year