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Old 03-28-2016, 10:23 AM   #1
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Naiad problem

The naiad system on my trawler had been working fine. Yesterday after getting waked from behind they now rotate to one side. In CENTER mode they are centered. When activated they rotate to one side. I thought I may have picked something up on the fins but the problem occurs when the boat is stopped.
Any ideas?


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Old 03-28-2016, 10:48 AM   #2
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Greetings,
Mr. M. Is the oil in the reservoir at the appropriate level? What are your gauge pressures? Do you have a manual?
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Old 03-28-2016, 11:20 AM   #3
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Oil at mark, temp, pressure at correct level. 100 page manual written by engineers for engineers.


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Old 03-28-2016, 12:21 PM   #4
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Greetings,
Mr. M. Well....



Sorry...
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Old 03-28-2016, 02:18 PM   #5
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Not sure what you mean by "rotate".
Do they work when underway? Are you making sure you have them on when underway?
Where are you located? I know a few good Naiad techs along the east coast.
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Old 03-28-2016, 05:55 PM   #6
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Check for loose wires on the position sensor on the top of the fin.
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Old 03-29-2016, 09:11 AM   #7
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Meridian

Did you do a re-boot where all power to stabilizers was shot off? What does the manual say under the trouble shooting tips?
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Old 03-29-2016, 09:41 AM   #8
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Quote:
Originally Posted by meridian View Post
The naiad system on my trawler had been working fine. Yesterday after getting waked from behind they now rotate to one side. In CENTER mode they are centered. When activated they rotate to one side. I thought I may have picked something up on the fins but the problem occurs when the boat is stopped.
Any ideas?


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So, to be clear, with the system on and when set to center the fin center?

When underway with the system active the fins work correctly?

When the system is off and the boat is not working the fins flop over to one side?
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Old 04-03-2016, 11:57 AM   #9
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Hi Bill:
Never really paid much attention to the Naiad positions on my trawler while in the water, but when stored out of the water for the Winter, they did "droop" after a while. One seemed more "droopy" than the other. I figured it was the result of a slow hydraulic pressure release (not a fluid leak) past the hydraulic pump or perhaps there is some non-return valve in each line. Nevertheless, they operated just fine when Summer came around again and all indications were normal.
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Old 04-03-2016, 12:13 PM   #10
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I have another problem but they may be related. Either the stbd piston or the actuator is leaking. The tank is drained. I'll fix that first then see what happens.
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Old 04-03-2016, 12:23 PM   #11
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Greetings,
Mr. m. Ahhh...Could it be a seal popped when you were waked? THAT would make some sense.
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Old 04-03-2016, 07:50 PM   #12
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Never thought of that.


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Old 04-03-2016, 09:42 PM   #13
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" I thought I may have picked something up on the fins but the problem occurs when the boat is stopped.
Any ideas?"

The fins flop over to one side only when the boat is stopped?
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Old 04-03-2016, 09:57 PM   #14
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When you say the boat is stopped, do you mean the engine is stopped or still idling??
Stopped engine means no hydraulic power to activate fins. Idle means you probably have leaking pistons/seals etc preventing sufficient pressure build to set fins.
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Old 04-03-2016, 10:00 PM   #15
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I once had a Niad hydraulic cylinder piston come loose from the shaft. The fin went over to one side, but wouldn't come back. I could tell oil was flowing because the hose was hot.
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Old 04-03-2016, 10:36 PM   #16
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When you say the boat is stopped, do you mean the engine is stopped or still idling??
Stopped engine means no hydraulic power to activate fins. Idle means you probably have leaking pistons/seals etc preventing sufficient pressure build to set fins.

He has pressure or the fins wouldn't center when set to.
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Old 04-04-2016, 08:12 AM   #17
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Bill:
Not saying he does not have pressure, just that the pressure bleeds away when engine (hydraulic pump) not running or running too slow at idle. Look for leaking seals, valves etc in the hydraulic lines. As previous, our fins did this during Winter storage over the course of a few months.
As for centering, the fins would not center if there is a significant pressure leak but will center otherwise when engine (pump) is running.
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Old 04-04-2016, 08:49 AM   #18
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Quote:
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Bill:
Not saying he does not have pressure, just that the pressure bleeds away when engine (hydraulic pump) not running or running too slow at idle. Look for leaking seals, valves etc in the hydraulic lines. As previous, our fins did this during Winter storage over the course of a few months.
As for centering, the fins would not center if there is a significant pressure leak but will center otherwise when engine (pump) is running.
There is zero pressure when the engine is not running. Whether a seal is leaking or not. With the system shut off it is normal for the fins to move around. Unless they are pinned there is nothing to hold them to center.

And you should have full pressure available at idle if the system is working correctly.

"As for centering, the fins would not center if there is a significant pressure leak but will center otherwise when engine (pump) is running."

The only time you have pressure is when the pump is running. So I am not following what you are saying here.
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Old 04-04-2016, 08:58 AM   #19
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Bill:
I think we are actually agreeing!!
All I am suggesting is that a leaky valve or seal in the fin hydraulic system could cause the fins to flop when the engine is not running or running too slowly to provide adequate pressure.
My fins did not flop normally with the engine off, except over an extended period (Winter).
Is this not what Meridian's concern is??
Or have I got the wrong end of the stick completely??
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Old 04-04-2016, 09:19 AM   #20
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Well, the engine speed should not be effecting the pressure under normal operation.

And your fins didn't flop over over time because pressure blead down over time.
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