Problem with Navtech-22 Hydraulic Integral Backstay Adjuster

RJV · 26-07-2009, 04:58

I have a Navtec-22 (part A370-LE-022) Hydraulic Integral Backstay Adjuster fitted to my yacht.

Recently it developed a fault …. although the unit held its pressure OK, and there were no signs of any fluid loss, pumping the adjuster handle had almost no effect, and bleeding possible air from the unit had no effect.

I thus removed the unit from my yacht to have it checked and repaired.

After nearly 3 weeks the unit has still not been repaired, as the repairer has been unable to obtain a technical (section) drawing of the adjuster locally or through the Australian Navtech distributor. The contractor is appropriately equipped and skilled to undertake the repair, but I understand that there is a "grub-screw" or "plug" (at this stage I can't be more specific than this) which has seized on the outside of the cylinder and in the absence of a sectional drawing it is particularly difficult for the contractor to progress the repair without risk to damaging the unit.

Does anyone have or can get a sectional drawing of this unit so that the repair can be progressed? I have emailed Navtech world HQ in the USA to see if they can oblige and I am awaiting a response. I'm in Australia and I'm not hopeful that Navtech will come through on this, sadly.

I am otherwise pleased with the performance of the unit and as it is barely two years old it ought to be repairable. The repairer intends to disassemble the unit and install a new Navtec seal kit which he has on hand.

Thanks.

GordMay · 26-07-2009, 05:46

I don’t know if any of these will help with your Navtec-22 (part A370-LE-022) Hydraulic Integral Backstay Adjuster:

➥ http://www.navtec.net/docs/Series7.pdf

➥ http://en.lewmar.com/pdfs/A370.xls

➥ http://www.americanriggingsupply.com...cBackstay1.pdf

➥ NAVTEC Rigging Solutions

RJV · 26-07-2009, 05:52

Thanks Gord May, but these docs are more aligned to sales brochures/operating instructions ..... and don't show a sectional (or "internal") view that we are needing.
Regards.

bstreep · 26-07-2009, 20:01

Hmm. I THINK I may have some stuff on ours on the boat. Unfortunately, we won't be back down until next weekend...

RJV · 29-07-2009, 16:37

Well, the repairer has managed to disassemble the unit and effect some repairs, and I've installed the adjuster back on my boat.

But I'm not sure it's performing as it should.

When I pump the handle the first 50 to 60% of the handle's stroke doesn't achieve anything - only the last 50 to 40% actually pumps fluid. It doesn't feel like it has air in it - it just feels like the handle doesn't "engage" the pump until late in the stroke.

And it also takes about 25 strokes to retract the RAM's piston about one inch (or 25mm) .... which seems like it's "underperforming". It's doing the job .... but is it meant to be this slow?

The literature says nothing about this.

Can anyone tell me how their RAM performs so I can compare with mine.

Thanks.

donradcliffe · 29-07-2009, 17:08

Mine sometimes works like you describe--I find that if I slow down, it seems to engage sooner. It does take a long time to retract a few inches--probably 100 strokes for 4 inches even on a good day. I had to have it rebuilt about 4 years ago because it leaked, and it was done in Turkey by a non-Navtec-certified rigger.

Don Lucas · 30-07-2009, 04:20

My also takes a while to pump up. I would think it is a better and safer design for it to pump slow instead of fast.

26-07-2009, 04:58	#1
RJV Registered User Join Date: Jul 2009 Location: Australia Boat: Beneteau Oceanis 50 Posts: 10	Problem with Navtech-22 Hydraulic Integral Backstay Adjuster I have a Navtec-22 (part A370-LE-022) Hydraulic Integral Backstay Adjuster fitted to my yacht. Recently it developed a fault …. although the unit held its pressure OK, and there were no signs of any fluid loss, pumping the adjuster handle had almost no effect, and bleeding possible air from the unit had no effect. I thus removed the unit from my yacht to have it checked and repaired. After nearly 3 weeks the unit has still not been repaired, as the repairer has been unable to obtain a technical (section) drawing of the adjuster locally or through the Australian Navtech distributor. The contractor is appropriately equipped and skilled to undertake the repair, but I understand that there is a "grub-screw" or "plug" (at this stage I can't be more specific than this) which has seized on the outside of the cylinder and in the absence of a sectional drawing it is particularly difficult for the contractor to progress the repair without risk to damaging the unit. Does anyone have or can get a sectional drawing of this unit so that the repair can be progressed? I have emailed Navtech world HQ in the USA to see if they can oblige and I am awaiting a response. I'm in Australia and I'm not hopeful that Navtech will come through on this, sadly. I am otherwise pleased with the performance of the unit and as it is barely two years old it ought to be repairable. The repairer intends to disassemble the unit and install a new Navtec seal kit which he has on hand. Thanks. Last edited by RJV; 26-07-2009 at 04:59. Reason: typo

26-07-2009, 05:46	#2
GordMay CF Adviser Join Date: Mar 2003 Location: Thunder Bay, Ontario - 48-29N x 89-20W Boat: C.L.O.D. (Cruiser Living On Dirt) Posts: 13,472 Images: 233	I don’t know if any of these will help with your Navtec-22 (part A370-LE-022) Hydraulic Integral Backstay Adjuster: ➥ http://www.navtec.net/docs/Series7.pdf ➥ http://en.lewmar.com/pdfs/A370.xls ➥ http://www.americanriggingsupply.com...cBackstay1.pdf ➥ NAVTEC Rigging Solutions __________________ Gord May ~~_/)_~~ (Gord & Maggie - s/v"Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?" Custom Search CF ➥ http://www.google.com/cse/home?cx=01...%3A2lb6ozabif0

26-07-2009, 20:01	#4
bstreep Registered User Join Date: Oct 2007 Location: San Antonio, TX/Corpus Christi, TX Boat: 1990 Macintosh 47, "Merlin" Posts: 853	Hmm. I THINK I may have some stuff on ours on the boat. Unfortunately, we won't be back down until next weekend... __________________ Bill Streep San Antonio/Corpus Christi, TX

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26-07-2009, 05:52	#3
RJV Registered User Join Date: Jul 2009 Location: Australia Boat: Beneteau Oceanis 50 Posts: 10	Thanks Gord May, but these docs are more aligned to sales brochures/operating instructions ..... and don't show a sectional (or "internal") view that we are needing. Regards.

29-07-2009, 16:37	#5
RJV Registered User Join Date: Jul 2009 Location: Australia Boat: Beneteau Oceanis 50 Posts: 10	Well, the repairer has managed to disassemble the unit and effect some repairs, and I've installed the adjuster back on my boat. But I'm not sure it's performing as it should. When I pump the handle the first 50 to 60% of the handle's stroke doesn't achieve anything - only the last 50 to 40% actually pumps fluid. It doesn't feel like it has air in it - it just feels like the handle doesn't "engage" the pump until late in the stroke. And it also takes about 25 strokes to retract the RAM's piston about one inch (or 25mm) .... which seems like it's "underperforming". It's doing the job .... but is it meant to be this slow? The literature says nothing about this. Can anyone tell me how their RAM performs so I can compare with mine. Thanks.

29-07-2009, 17:08	#6
donradcliffe Registered User Join Date: Mar 2007 Location: Caribbean for the winter Boat: Beneteau First 456 Posts: 720	Mine sometimes works like you describe--I find that if I slow down, it seems to engage sooner. It does take a long time to retract a few inches--probably 100 strokes for 4 inches even on a good day. I had to have it rebuilt about 4 years ago because it leaked, and it was done in Turkey by a non-Navtec-certified rigger.

30-07-2009, 04:20	#7
Don Lucas Registered User Join Date: Jul 2007 Location: Salem MA Boat: Cal 39 - D & D Posts: 765	My also takes a while to pump up. I would think it is a better and safer design for it to pump slow instead of fast.