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Old 05-24-08, 12:30 PM   #1
mkauffman
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Fork won't hold air

So I have an 04 (I think) Rockshox Duke SL Air. I did notice that it was leaking air very slowly, meaning I'd have to pump it up once a month or so, but recently it won't even do that. Now it doesn't hold air at all.

So how difficult would it be to replace the seals? I do all of the work on my bikes, but have never even attempted to play with a fork like this. What sort of tools and fluids would I need? Should I just say screw it and bring it to the shop?

Thanks,

Matt
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Old 05-24-08, 12:45 PM   #2
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Check out the service manual here.

If you have the needed tools (or want to buy them), just changing out the O-rings for an air leg is really not tough.
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Old 05-24-08, 01:00 PM   #3
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So will I just need an O ring service kit? It sounds easy enough to do that. Thanks!
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Old 05-24-08, 04:29 PM   #4
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If they are JUST Orings then you can get replacements at most decent hardware stores. Orings use an odd number convention for sizing so take out the old ones and use it to compare the new ones to so you get the right ones
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Old 05-24-08, 05:12 PM   #5
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So will I just need an O ring service kit? It sounds easy enough to do that. Thanks!
Yes, although you may find many of the O-rings at a hardware store, I'd still buy them through RockShox. It'd be a real hassle if you missed spec on one of them and had to tear the fork down again. Some forks will also include proprietary parts that you won't find anywhere but RockShox.
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Old 05-25-08, 02:27 PM   #6
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I went ahead and ordered the o-ring replacement kit, figured I may as well just replace them all.
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Old 06-19-08, 10:22 AM   #7
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(Apologies in advance for cross posting...)
I have been having the same problem with my Duke. Recently left the bike hanging upside down in a friends garage adn the oil leaked out. Would this be an indication that seals need to be replaced, or that the air valve is loose...?
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Old 06-19-08, 01:33 PM   #8
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I have been having the same problem with my Duke. Recently left the bike hanging upside down in a friends garage and the oil leaked out. Would this be an indication that seals need to be replaced, or that the air valve is loose...?
I hung my Reba upside down and lost the oil. After finding all the drained oil, I discovered the top cap on the right leg was slighty loose. Don't know if this was from the factory, or from using the PopLoc, or some other evil...

My LBS suggested that I take it apart, clean everything, and replace the oil before replacing any seals. The fork is less than a month old and I didn't want to send it to RockShox. I'll be taking it apart this weekend.
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Old 06-19-08, 03:45 PM   #9
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did you try tightening or replacing the schrader valve core first? start cheap....
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Old 06-24-08, 02:30 PM   #10
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I actually rebuilt the fork. No new o-rings but a new valve (the stem was broken). Took it all apart, cleaned, reseated the boot on one side (which I think may have been a problem). Now I have an issue where when compressed it sounds/feels good. If I am just rolling over washboard I get a clunking that sounds like a loose headset. It is like the fork is topping out hard. It is like it isn't 'acitivating' over the little bumps. Was rattling like mad during last nights short track race! Any ideas, suggestions? (Sorry for hijacking "kauffman" - I'll start a new post if folks think it is more appropriate.)
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