JeffRoss

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

kleng

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

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

JeffRoss

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

Michel Gagnon

I have replied to another similar message not long ago. It's probably OK.

JeffRoss

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

RalphMalph

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.

n4zou

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.
https://pilom.com/BicycleElectronics/...lectronics.htm

Here is my dual high power LED headlight before attaching the cover.

BarracksSi

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).

JOH

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!