[PUP] Rudder failure while underway.

[lali...@alum.rpi.edu]

Today, while underway, my hydraulic ram cylinder separated from the coupling that it is attached to which is attached to the rudder post.

Had the Nav alarm simultaneously with the “thud” from the lazarette.

Tried to jury rig but no dice.

So, while in neutral, banged out the pin holing the coupling to the rudder ram post, screwed the coupling back on to the threads of the hydraulic cylinder ram till about 5 threads were showing, tighten the lock washer nut, and reassembled.

But for the life of me, cannot figure out how the ram unscrewed itself, unless it can slowly rotate when under hydraulic power?

Can anyone give to me a hint?

And, if you have such a unit, is your fully screwed in or are their threads showing?

And this lock nut is kind of thin (original equipment) and by fighting it, I am unloading the threads of the ram and loading the threads of the locking nut.

Is that really what I should be doing?

Lee

Ayvaklik Tu
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[Ken Tischler]

Lee,

In my previous life I worked for a company that manufactured hydraulic
steering systems for commercial marine vessels; everything from tugboats to
175' yachts. During installation, we always specified that the clevis MUST
be pinned to the cylinder rod. This was accomplished by drilling a hole
through the clevis and rod in the threaded area, then driving a small
stainless pin in to it. Lock nuts were not enough to stop the rod from
backing out of the clevis. We actually had a lawsuit as a result of
steering loss due to the clevis coming off, as yours did. The shipyard had
not pinned it, as specified on our installation drawings.

The rod and piston can, and will, rotate as it moves in an out of the
cylinder. Unless something prevents it.

--
Ken Tischler
Microship
DeFever 49RPH
Bay St Louis, MS

[LAL]

Here is a slide show that may add some clarity to the first email
http://youtu.be/f9pLNY3ShLo
Lee
Ayvaklik Turkey

On Tue, Aug 5, 2014 at 12:13 AM, lalicata--- via
Trawlers-and-Trawlering <traw...@lists.trawlering.com> wrote:
> Today, while underway, my hydraulic ram cylinder separated from the coupling that it is attached to which is attached to the rudder post.
>
> Had the Nav alarm simultaneously with the “thud” from the lazarette.
>
> Tried to jury rig but no dice.
>
> So, while in neutral, banged out the pin holing the coupling to the rudder ram post, screwed the coupling back on to the threads of the hydraulic cylinder ram till about 5 threads were showing, tighten the lock washer nut, and reassembled.
>
> But for the life of me, cannot figure out how the ram unscrewed itself, unless it can slowly rotate when under hydraulic power?
>
> Can anyone give to me a hint?
>
> And, if you have such a unit, is your fully screwed in or are their threads showing?
>
> And this lock nut is kind of thin (original equipment) and by fighting it, I am unloading the threads of the ram and loading the threads of the locking nut.
>
> Is that really what I should be doing?
>
> Lee
>
> Ayvaklik Tu
> _______________________________________________

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[LAL]

Sorry, fixed that!

Lee

On Tue, Aug 5, 2014 at 3:40 PM, Paul Weakley <pwse...@gmail.com> wrote:
> This video is private.
>
> Sent from my iPad

>
>> On Aug 5, 2014, at 7:42 AM, LAL via Trawlers-and-Trawlering <traw...@lists.trawlering.com> wrote:
>>
>> Here is a slide show that may add some clarity to the first email
>> http://youtu.be/f9pLNY3ShLo
>> Lee
>> Ayvaklik Turkey
>>
>> On Tue, Aug 5, 2014 at 12:13 AM, lalicata--- via
>> Trawlers-and-Trawlering <traw...@lists.trawlering.com> wrote:

>>> Today, while underway, my hydraulic ram cylinder separated from the coupling that it is attached to which is attached to the rudder post.…

[LAL]

Dear All.

I fixed the video. It is now no longer private.

Thanks to all who noticed.

Lee