Navtec System V Multifunction Panel

[infinitysail]

I have a Navtec System V Multifunction Panel and the pump has started leaking out the seal in the back. We are in Panama and I want to send the pump into the local hydraulic shop, but I want to make sure I can take the pump off the back of the panel.

It looks like I can remove the 3 bolts on the front of the panel holding the pump in place, as well as 4 allen screws on the back holding the pump onto the relief valve/pressure gauge mechanism. Has anyone done this, and do you have any advice? Is there a service manual in existence? The System V manual linked on cruisersforum is just a user manual. Also, are there seals in the selector and relief valve that should also be replaced?

I've attached pics of the front and back of the panel for reference.

Edit: My pressure gauge is broken also. Are these hard to replace?

[infinitysail]

I took the pump off, which was straightforward. What I thought was a seal on the back is just a bearing for the shaft that actuates two pistons that go into the pump housing. I am guessing that these two pistons are sealed by o rings that need replacing. Here is a side pic of the pump showing one of the pistons going into the pump. The pump is on its side and the piston is the horizontal bronze tube.

Does anyone know what the seals for these pistons are and if they are accessed from the top of the pump or from the bottom?

[LeaseOnLife]

just to make sure, do you have the drawings & Service Manual?

http://www.hisse-et-oh.com/system/as...pdf?1321964899

In case they disappear from the web, I can send them as email. Might be worth identifying the seal kit and have it shipped before going to the hydraulic shop.

Dirk

PS: Greetings to G., we were in the same 'taxi' from PC, then helping Elysium thru the canal.

[infinitysail]

Thanks Dirk! That is exactly what I needed. Looks like the piston seals and o ring are all off the shelf items. Sadly, none in stock in Panama. But I'll ship them in from the US and do the rebuild myself!

Now, are the cylinders just as easy? I'll have to find out some day.

Frank

[LeaseOnLife]

Hi Frank

My hydraulic (integral) backstay adjuster was OK to rebuilt per that manual, but I did use a complete kit from Navtec, the kit also had new gaskets, pressure relieve springs and valves if I remember right.

Some of the cylinders (boomkicker?) are filled with pressurized gas on one side of the piston, they could be more problematic to work on.

Cheers

Dirk

[bstreep]

Yeah, be careful on these. Our vang is pressurized to 1000lbs, because we have an inboom furler. They are dangerous at that point. The backstays are no big deal.

[captKarlNorway]

Originally Posted by LeaseOnLife

just to make sure, do you have the drawings & Service Manual?

http://www.hisse-et-oh.com/system/as...pdf?1321964899

In case they disappear from the web, I can send them as email. Might be worth identifying the seal kit and have it shipped before going to the hydraulic shop.

Dirk

PS: Greetings to G., we were in the same 'taxi' from PC, then helping Elysium thru the canal.

Hi Dirk

Still have this drawing??
Now it my turn to change seals around the pistons.. :-)

[LeaseOnLife]

Originally Posted by captKarlNorway

Hi Dirk

Still have this drawing??
Now it my turn to change seals around the pistons.. :-)

above link still works to download the file, at least for me...?!?

[captKarlNorway]

hmm. now it did for me too. ThX.

[Pagan Ways]

Is this NavTec drawing still available? The link doesn't work now in 2024. I would also appreciate know what off the shelf seals you used. I'm in Mexico and the seals just crumbled away when I removed the pistons.
My panel is identical to the author of this post.

[nuku34]

hello Pagan Ways,
I have the complete Navtec service manual which includes all System 5 components.
I can e-mail the 1.4 MiB pdf file to you if you give me your e-mail address.


I haven't taken my System 5 pump apart (yet), but I'm guessing that the piston seals are generic and available from any good engineering supply shop. Probably best to measure the various dimensions and get a buddy in the USA to source them for you.

[Pagan Ways]

Thanks for the offer of the manual. I've sent my email. I expect I can get the parts in Mexico if I can show what I need.
I had custom manufactured seals made for the tensioner cylinders for 500 pesos each, and they were delivered in two days.

[kaivai]

Hello to anyone willing to chime in,

I have same system on 50ft Southerly. I have the rear cylinders although they are removed - hoses cut. Boom vang and control panel still in place.

I'm considering removing and tossing the entire system. Just don't know WHY I would want to mess with it in this blue water cruiser.

Any suggestions?

Tim
CEBU, Philippines

[Pagan Ways]

The system was installed on the boat and I figured it's easier and cheaper to maintain it than replace it. Here in Mexico having custom seals etc. made is cheap and easy. The pump seals were also custom and have been working perfectly for less than $20.

I agree, as I'm not in to racing and and would prefer a zero maintenance option. But it's installed and paid for and so will remain on the boat.