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S&S Swan Maintenance - Krueger mark II Backstay adjuster maintenance
17 July 2014 - 23:13
Join Date: 19 October 2012
Posts: 44

Krueger mark II Backstay adjuster maintenance
Hi Lars and everybody,

Pippus after 2 months continuing cruises, has the Mark 2 hydro tensioner leaking from the pump axle. Probably after our recent threads on what tension giving to the adjuster I have used it more than in the past.
In fact in the last half year cruising I have tensioned it up to 4000/4500 lbs. (as suggested with you) before each cruise and when moored I decreased to a lower charge of 2000 lbs. in order not to give too strength to the whole boat (is it right?)

I have red in a 2011 threads about the same problem in a 57, that you suggested to refer to an American company able to renew the Krueger.
Do you have some address in Europe too?

Many thanks

Pippus 44-011

18 July 2014 - 19:15
Join Date: 02 January 2008
Posts: 1547

Dear Alberto
It would be advisable not to keep the full backstay tension when carrying a spinnaker off the wind in broaching conditions, because the high compression in the long top mast above the upper shrouds may make the top unstable sideways.
It is appropriate to reduce the tension in harbour, and you may go to lower numbers, 500 would be fine.
The USA company suggested for Krueger service had a connection to the original manufacturer.
In Europe there are no such companies, but very skilled service is available at
Kind regards

18 July 2014 - 19:35
Join Date: 19 October 2012
Posts: 44

Many thanks Lars, you are a living Encyclopedia !

Pippus 44-011

20 August 2014 - 18:38
Join Date: 23 February 2008
Posts: 15

Hi, Alberto,

You should be able to service your Kreuger backstay tensioner yourself with off-the-shelf O-rings & seals. I have done ours on our Swan 44 a few times in the last 20 years. Once you open the unit carefully (there is a tiny spring in the bottom), it is pretty obvious. I tend to do ours in a bucket to contain the oil. Just be sure to orient the body exactly the same during reassembly. I have attached a list of seals I got from Mr. Kreuger many years ago before he retired but understand the drawing is NOT to scale. I hope this helps.

Kreuger Backstay Seals

21 August 2014 - 13:44
Join Date: 19 October 2012
Posts: 44

Thanks Candy for your suggestions.

But where is it still possible to find those seals man o-ring?

Bst Rgrds


23 August 2014 - 21:35
Join Date: 29 January 2007
Posts: 1025

Dear Alberto,

Candy kindly sent me a high definition file of the above drawing and I have uploaded it in the Maintenance section

Fair winds!

matteo (38/067 Only You)

24 August 2014 - 17:42
Join Date: 31 January 2007
Posts: 52

Thanks, Matteo!

28 August 2014 - 02:02
Join Date: 23 February 2008
Posts: 15

Hi, Alberto. Since the O-rings & seals are standard items, the part numbers are for Parker seals, not a Kreuger part number. Any good shop that carries this type of thing should be able to cross-reference for an equivalent part that meets spec if they don't carry Parker. I see Matteo has uploaded the better image I sent him so if you can print it out & take it to a shop, they should have no problem.

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