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Old 17-05-2013, 16:07   #1
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Hydraulic Steering Question

On my HR 35, I have hydraulic steering. I have always had a tiller bost, so this system is new to me. One thing I have noticed is a 45 degree either way on the wheel before the ram begins to move the rudder. I have bled the lines a few times with no evidence of air. Is this normal? If you have hydraulic steering, let me know how yours is...Thanx
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Old 17-05-2013, 16:17   #2
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Re: Hydraulic Steering Question

well mine is old and leaky so it creeps, but it responds to the wheel immediately, i regularly increment by 10-ish degrees when hand steering. What you describe does sound unusual - do you know what make the steering pump is? Does the system have a pressure release valve - common on newer systems to protect against back pressure from sea on rudder stress?
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Old 17-05-2013, 17:31   #3
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Re: Hydraulic Steering Question

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well mine is old and leaky so it creeps, but it responds to the wheel immediately, i regularly increment by 10-ish degrees when hand steering. What you describe does sound unusual - do you know what make the steering pump is? Does the system have a pressure release valve - common on newer systems to protect against back pressure from sea on rudder stress?
Ya...It has some sort of valve across both lines. It had another same valve on the dead hydraulic I took out. Do you think it could be the the pressure relief valve? I kept the other one.
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Old 17-05-2013, 18:15   #4
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Re: Hydraulic Steering Question

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Originally Posted by Celestialsailor View Post
On my HR 35, I have hydraulic steering. I have always had a tiller bost, so this system is new to me. One thing I have noticed is a 45 degree either way on the wheel before the ram begins to move the rudder. I have bled the lines a few times with no evidence of air. Is this normal? If you have hydraulic steering, let me know how yours is...Thanx
That's not normal. If it's a Sea Star system, they have pretty good factory support.
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Old 17-05-2013, 18:40   #5
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Re: Hydraulic Steering Question

I'll have to check out the make.
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Old 17-05-2013, 23:19   #6
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Re: Hydraulic Steering Question

i wondered about the pressure valve because its hard to imagine how a closed system could do what you describe - but - i dont know much about the pressure valves - if they are interchangeable you could try the old valve on your new system to see if it makes a difference - hope someone a bit more knowledgeable than me can chip in...
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Old 18-05-2013, 00:21   #7
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Re: Hydraulic Steering Question

Thanx for your input...maybe someone will chime in on this one.
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Old 18-05-2013, 15:52   #8
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Re: Hydraulic Steering Question

Is it 45' before the ram moves, or before the rudder moves? It could be as simple as too much freeplay in the mechanical part of the system, where the ram attaches to the quadrant. Once you've gotten all the air out, there really shouldn't be any freeplay in hydraulics.

An easy way to find out is to try pushing the rudder from side to side. Ideally it shouldn't move at all.
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Old 18-05-2013, 17:18   #9
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The valve between the two lines is to allow the use of an emergency tiller.


Ps what's the dead hydraulic line you removed.

I would check for mechanical play firstly

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Old 18-05-2013, 19:54   #10
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Re: Hydraulic Steering Question

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Is it 45' before the ram moves, or before the rudder moves? It could be as simple as too much freeplay in the mechanical part of the system, where the ram attaches to the quadrant. Once you've gotten all the air out, there really shouldn't be any freeplay in hydraulics.

An easy way to find out is to try pushing the rudder from side to side. Ideally it shouldn't move at all.
I checked all that...no play

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The valve between the two lines is to allow the use of an emergency tiller.


Ps what's the dead hydraulic line you removed.

I would check for mechanical play firstly

Its a check valve...not a mechanical by-pass which I also have.

Do either one of you have hydraulics?

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Old 18-05-2013, 20:00   #11
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Its air, Bleed exactly as per Sea Stars instructions , especially if you have any "uphill" piping


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Old 18-05-2013, 21:52   #12
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Re: Hydraulic Steering Question

Is this the instructions?
Sea Star Fill & Purge Instructions and Troubleshooting
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Old 18-05-2013, 22:35   #13
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Re: Hydraulic Steering Question

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Those instructions look like they should do. If there is no backlash in the system there should be NO backlash in the wheel. Air compresses, oil does not. So, every movement of the wheel should get you positive movement at the rudder.

This one of the reasons I went with hyd steering, no backlash. I even have gauges P/S that tell me how much feed back/weather helm I'm getting on the rudder.
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Old 18-05-2013, 23:33   #14
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Re: Hydraulic Steering Question

Ok...good...My system is the original Vetus system.
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Old 19-05-2013, 20:31   #15
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Re: Hydraulic Steering Question

Aloha Martin,

Let us know what the solution is. Just like your engine problem dilemna, "inquiring minds need to know."
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