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  1. #1
    Cheyenne Commuter JeffRoss's Avatar
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    New Shimano DH-3D71 is really rough!

    Got my new wheel built around a new Shimano DH-3D71. This is the first time I've ever seen one of these, and the same for my LBS. Man does this hub turn rough. I know that there will be more drag when there isn't a light being driven, but this thing turns hard!

    Is that normal? George at the LBS says it doesn't feel like bearing drag, but it sort of does to me. I haven't been able to find any servicing instructions, so any pointer there would be great.

    Thanks!

    Jeff Ross

  2. #2
    Senior Member kleng's Avatar
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    Its a cup and cone bearing set-up so you should be able to back off the cone a little bit to free up the bearings.

    This is the tech doc

    http://bike.shimano.com/media/techdo...9830608784.pdf

  3. #3
    Cheyenne Commuter JeffRoss's Avatar
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    Right, I found that, too.

    So it's okay if I pack the hub with Phil Wood grease and adjust it like any other hub? Somewhere I thought I'd read that these hubs used sealed bearings, but the pdf shows that isn't the case at all.

    Thanks for the quick reply!

    Jeff

  4. #4
    Year-round cyclist
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    I have replied to another similar message not long ago. It's probably OK.
    Michel Gagnon
    Montréal (Québec, Canada)

  5. #5
    Cheyenne Commuter JeffRoss's Avatar
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    Update--

    After adjusting the hub, it spins way better. When mounted on the bike but without driving a light, it will easily spin 40 revolutions when spun by hand and feels much moe like a normal front wheel.

    When I engage the light, though, the drag on the wheel increases dramatically and I can barely get 4 revolutions when I spin by hand.

    Taking it out for a test spin on the dirt roads around home, though, is fine--lots and lots of light and no noticable drag :-)

    Jeff

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    Hey, I am in the process of having a wheel built around one of these and ran across this thread. I am mechanically inclined but have little bicycle mechanic experience. Can you tell me exactly what you did to get this thing running smooth?

    I very much appreciate any help.

  7. #7
    Scott n4zou's Avatar
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    Quote Originally Posted by JeffRoss View Post

    When I engage the light, though, the drag on the wheel increases dramatically and I can barely get 4 revolutions when I spin by hand.
    Four rev's is right, I only get two and a half or three with my tire driven dynamo.
    Now you need a super bright LED headlight. If you can build your own stuff look here.
    http://pilom.com/BicycleElectronics/...lectronics.htm

    Here is my dual high power LED headlight before attaching the cover.
    Last edited by n4zou; 05-17-08 at 07:53 PM.
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  8. #8
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by RalphMalph View Post
    Hey, I am in the process of having a wheel built around one of these and ran across this thread. I am mechanically inclined but have little bicycle mechanic experience. Can you tell me exactly what you did to get this thing running smooth?

    I very much appreciate any help.
    Check the second post --

    Basically, the cone & cup-style bearings are like anything else; make them too tight and they'll bind, make them too loose and they'll wobble.

    The parts that you'd adjust would be #10 in that diagram (there's one on each side).

  9. #9
    JOH
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    Shimano DH-3D71 Problem - Fix

    Hello - Can you tell me what exactly you did to fix your problem? My wheel wobbles. It is not the spokes/trueness of the wheels. Thanks much!

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