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02-09-2017, 04:39 PM
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#1
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Hynautic steering (antique)
I am having problem with my steering - can not keep the air pressure. It supposed to be 20 psi at all time, but I do not see any hydraulic fluid leaks. Oil level constant. The H-21 pump does make some noise but work. I have "hard time" to locate the reservoir - I think that there is my problem. I did replace the copper lines and bypass the auto pilot to eliminate the leak. It is 1973 Gulfstar 36. From what I read - the air pressure is there to keep any bubbles away, but should not affect the steering if the system is "tight". I got good steering from the bottom, but got sloppy from top.
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02-09-2017, 07:30 PM
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#2
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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If you're not leaking hydraulic fluid, then it's likely losing air at the reservoir. You can use a soft brush and soap suds to check for air leaks once you have re-pressurized the system. The Schrader valve in the filler cap is a likely suspect, as well as the filler cap o-ring.
The noise in the h21 helm is not uncommon, as it is a rotary piston pump.
Imho Hynautic is a quality product, I sold, and installed them for many years.
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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02-09-2017, 07:47 PM
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#3
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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I did replaced the valve, but still no luck. I notice that the valve house is damage and the relief valve can not be screw properly - thread damage. Where I can find the reservoir?. Mine have plastic tube ( fluid level). The others I saw have section fluid level.
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02-09-2017, 08:04 PM
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#4
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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I sent a private message with info that should help.
From you photo, yours is the older style with the the built in air pump. Any of the Hynautic steering reservoirs will work as a replacement.
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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02-10-2017, 07:29 AM
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#5
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Got it. Thanks.What is that "thing" on left of gauge?. The bottom of that "thing" have a thread but will not tight down. I believe that is mess up.
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02-10-2017, 08:43 AM
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#6
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Senior Member
City: Oriental, NC
Vessel Name: M/V Major Award
Vessel Model: Senator 35 w/single Lehman
Join Date: Oct 2007
Posts: 423
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My bet would be the pump is leaking air if no other leaks visible elsewhere. Soap mix with water and look close for bubbles. Where air goes in air can come out.
__________________
It is not who is right...it is who is left.
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02-10-2017, 08:59 AM
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#7
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,235
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Quote:
Originally Posted by nodestination
Got it. Thanks.What is that "thing" on left of gauge?. The bottom of that "thing" have a thread but will not tight down. I believe that is mess up.
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That is a small finger pump which does not screw down. You should be able to pump it up and down and it will add pressure. It could very well be that the valve at the bottom of that is worn and leaking air back out.
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02-10-2017, 12:17 PM
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#8
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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That's the air pump. The pump assembly should unscrew from the reservoir top plate. You may be able to locate, and replace the entire pump assy. if that is where your air leak is. Or if you can remove the pump assy., then simply fit a solid plug into the hole, you can use a bike tire pump to pressurize the reservoir. many of the Hynautic system reservoirs were configured this way.
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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02-10-2017, 01:23 PM
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#9
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Senior Member
City: Oriental, NC
Vessel Name: M/V Major Award
Vessel Model: Senator 35 w/single Lehman
Join Date: Oct 2007
Posts: 423
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I use a Harley Davidson pump (same for my shocks and air bladder police seat). It is small, has a mechanically flexible hose/connector and best of all attaches and detaches with no loss or change in pressure. It has a gauge attached which is very accurate and readable. I highly recommend for this application.
__________________
It is not who is right...it is who is left.
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02-11-2017, 11:51 AM
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#10
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Thanks for the info on that pump. I have 3 manuals, but none of them mention the punp. I will block it and see what happen.
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02-13-2017, 12:06 PM
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#11
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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I did remove that air pump - it was leaking. The whole assembly is "mess up". I did block the hole, but still , somewhere, I have a leak. What is the purpose of the air in system. Can I drive without?. Someone told me that the air pressure is there to pump the fluid to upper station. If that the case, would be more easy to just put the reservoir in upper station?. Thanks.
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02-13-2017, 01:32 PM
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#12
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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You DO need the reservoir pressurized to provide fluid to both stations. The replacement solid plug with Schrader valve is hp6040 (Teleflex SeaStar).
The complete reservoir is hp5810hy.
Hope this helps. You can see photos on sea mar.com website.
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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02-13-2017, 03:52 PM
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#13
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Something wrong with the mar.com website.
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02-13-2017, 04:09 PM
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#14
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Can I just replace both pumps with BayStar 1.1 HH4311-3 and get raid of the reservoir?.
I had those pumps on my 1974 Marine Trader 34.
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02-13-2017, 04:41 PM
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#15
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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That would probably work, keep in mind the displacement should be close to what you have currently, I believe the h21 is a 2.0 cu in. Pump, also you might make sure the steering wheel's will fit the new pumps. Good luck!
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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02-13-2017, 06:49 PM
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#16
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Guru
City: Walkabout Creek
Join Date: Jan 2013
Posts: 8,601
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The Hynautic systems are pretty good, and the pressurized reservoir makes bleeding a bunch easier. If I were you I'd track down the leak, and perhaps rebuild the two helm pumps.
__________________
MVTanglewood.com
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02-15-2017, 10:38 AM
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#17
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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I eliminated the reservoir as source of a leak. The pressure gauge do not shows any fluid leaks. If the gauge will leak, it will shows a fluid leak, but is none. If I am correct, the gauge register fluid pressure and not air pressure. If any pump would leak, will the fluid shows or the air will leak without fluid leak?. Thanks.
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02-19-2017, 07:12 AM
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#18
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Senior Member
City: Green Cove Springs,FL
Vessel Name: No Destination
Vessel Model: 1972 GulfStar Trawler 36
Join Date: Apr 2016
Posts: 199
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Victory after all. I found the source of the leak and now I have steady pressure. It was the 2 bolts that hold the reservoir - were leaking on back, that is why I could see. I use small mirror and found the bubbles. All work fine now.
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02-19-2017, 07:17 AM
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#19
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,235
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Good job!
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02-19-2017, 12:30 PM
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#20
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Senior Member
City: Anacortes
Vessel Name: Salish Nomad
Vessel Model: American Tug 34
Join Date: Jan 2017
Posts: 317
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Glad you were able to fix it!
__________________
Dave Thompson
American Tug 34-109
Home Port Anacortes Skyline & Sitka AK
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