What exactly does it do? - BMW Luxury Touring Community
 
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post #1 of 15 Old Mar 19th, 2013, 7:38 pm Thread Starter
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What exactly does it do?

I'm talking about the hydraulic knob under your seat that supposedly adjusts your suspension. I don't see how it could affect the spring pre-load for carrying heavier weights because screwing in the knob doesn't affect the spring at all it is pushing hydraulic fluid some where to adjust something. So it must only affect the dampening. Anyway would one of you mechanical guru's explain in detail so I know what it does, Thanks
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post #2 of 15 Old Mar 19th, 2013, 8:06 pm
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Re: What exactly does it do?

If it is still full of oil it is pushing a ring piston increasing the pre-load on the spring. If you don't see movement at the top of the spring it needs to have the oil replenished.

John
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post #3 of 15 Old Mar 19th, 2013, 10:57 pm
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Re: What exactly does it do?

what part of the Clymer manual is this in? trying to figure out what the technical name is and where it describes the oil levels, etc.how do you check it for fluid level? and what's the fluid in it?

Mike Hammel (My Camel) [WB9GMO/4]
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post #4 of 15 Old Mar 20th, 2013, 6:12 am
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Re: What exactly does it do?

Mine is not working either. I would love to know how to service this.

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post #5 of 15 Old Mar 20th, 2013, 6:26 am
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Re: What exactly does it do?

Quote:
Originally Posted by Craigmri
Mine is not working either. I would love to know how to service this.
Good read starting here.

Last edited by Dick; Mar 20th, 2013 at 10:05 am.
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post #6 of 15 Old Mar 20th, 2013, 6:38 am
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Re: What exactly does it do?

or this:

http://www.bmwlt.com/forums/showthread.php?t=8406

Cheers, StClair

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post #7 of 15 Old Mar 20th, 2013, 8:17 am
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Re: What exactly does it do?

Quote:
Originally Posted by Dick
Dick,

Cut and paste got you on this one.

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post #8 of 15 Old Mar 20th, 2013, 9:57 am
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Re: What exactly does it do?

Quote:
Originally Posted by johnbaker15
Dick,

Cut and paste got you on this one.
Yeppir, sure did, John. Thanks for the headsup. Still getting used to an iPad touchie thang over my good laptop keyboard. My bad.
I think I fixed it - thanx again, John.

Last edited by Dick; Mar 20th, 2013 at 10:06 am.
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post #9 of 15 Old Mar 20th, 2013, 11:00 am Thread Starter
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Re: What exactly does it do?

Thanks for the explanation, after reading the different posts it appears mine is low on fluid so I will attempt to fill it as the procedure seems simple enough. Thanks Guru's
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post #10 of 15 Old Mar 20th, 2013, 11:23 am
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Re: What exactly does it do?

Quote:
Originally Posted by mycamel
what part of the Clymer manual is this in? trying to figure out what the technical name is and where it describes the oil levels, etc.how do you check it for fluid level? and what's the fluid in it?
You won't find it in the Clymer manual. But look at Dick's post and go to message 16 if it doesn't take you there. It has instructions along with pictures. I do mine at least twice a year. Sometimes it needs oil, sometimes not. I use hydraulic jack fluid available at any auto parts store.

"Uncrank" it all the way and ride around the neighborhood, especially two up and you'll see what it does. Then crank it down and do it again. Then you really see the difference. Uncranked it feel like you have a flat tire.

Chris Ehlbeck
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post #11 of 15 Old Mar 20th, 2013, 11:29 am
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Re: What exactly does it do?

The key to making this work is to push the follower plate in through the hole. That will allow maximum fluid to be added.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #12 of 15 Old Mar 21st, 2013, 11:13 am Thread Starter
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Re: What exactly does it do?

Where does the fluid go if it is a closed system?
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post #13 of 15 Old Mar 21st, 2013, 11:26 am
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Re: What exactly does it do?

Quote:
Originally Posted by norton
Where does the fluid go if it is a closed system?
That seems to be a mystery. I have to turn mine in about 1.5 turns before feeling resistance and that's where I left it for solo riding without additional load. I assume cranking in more preload will raise the rear end / seat height which I want to avoid. Is that right?

Jim
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post #14 of 15 Old Mar 21st, 2013, 11:36 am
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Re: What exactly does it do?

Quote:
Originally Posted by norton
Where does the fluid go if it is a closed system?
It's something we've been wondering for a long time.

Chris Ehlbeck
2002 BMW K1200LTE Toscana Green Retired with 85,391 miles
2014 BMW R1200RT Quartz Blue Metallic

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post #15 of 15 Old Mar 21st, 2013, 7:19 pm Thread Starter
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Re: What exactly does it do?

Does anyone know how much it will pre-load the spring ie: 1/4" 3/8" ?
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