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Old 07-15-06, 10:01 PM   #1
MistaMuShu
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stuck shimano nexus 4 speed

I just got a killer bargain from craigslist: a shimano 4 speed nexus with roller brake (? brake actuated with a cable) in a 700c wheel, a grip shifter, and a chain tensioner.

The only problem being the hub doesn't work. I see it as a great opportunity to dig in and see how it's made. The axle does not spin, or requires lots of force to spin. If I grip the cog and try to spin it from there (also requires a bit of force), I think I can feel the freewheel ratcheting because it follows a pattern of spin half circle, click, spin, click, spin...

My more knowledgeable bike buddy made a guess that _something_ might be too tight. We'd like to loosen off and peer in from the drive side. Instead of an axle nut, there's something that resembles a mini-cassestte (slightly larger in diameter than a nut, and has splines). What kind of tool can grip this?

Are there any service manuals for the nexus hubs? Can anyone speak from personal experience? Any online links? Guesses?

I figure $30 was worth the fun in trying to figure it out.
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Old 07-16-06, 05:00 AM   #2
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Is the brake releasing all the way?



Are you sure?
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Old 07-16-06, 06:21 AM   #3
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i got a whole bike with an INTER 4 for 60eu... but the brake is pedal operated... and i had a bit of a sticky prob, but i just cleaned it (with out taking it apart) real well with degeasers and then hit it with WD-40... and then dryied it all up with a cloth, and its much better now...

oh and the brake squeals like a b!t$h when im going real fast, and slow down fast... downhill...

pics???
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Old 07-16-06, 06:40 AM   #4
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Look here for the info you seek.
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Old 07-16-06, 10:46 AM   #5
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Originally Posted by Stacey
Is the brake releasing all the way?



Are you sure?
I tried pulling and pushing the brake cable, but that still didn't work. One interesting thing is the black metal piece that routes the cable will rotate. I'll try to post some pictures to clarify later.
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Old 07-16-06, 11:27 AM   #6
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I tried pulling and pushing the brake cable, but that still didn't work. One interesting thing is the black metal piece that routes the cable will rotate. I'll try to post some pictures to clarify later.
Take a look at the link I provided, that would be the place to start.
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Old 07-16-06, 02:32 PM   #7
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The link was PERFECT!
thanks, if MistaMuShu would rebuild (take apart and put it back to getther after inspection) using those pdfs im pretty sure Mista will find his/her problem and probably fix it... personaly, i dont feel like busing open my only hub... once i get me a fixed rear wheel im all in...
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Old 07-16-06, 06:13 PM   #8
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Look here for the info you seek.
wow thank you so much! This looks very promising.
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Old 07-16-06, 06:34 PM   #9
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You're both welcome. Let us know how you make out, okay?
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