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Old 09-12-12, 06:14 PM   #1
Dayton Duo
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Sachs 3x7 Internal Hub

I am posting here since many folding bikes have internal geared hub and I got no help in the bicycle mechanics forum. I am looking for someone who has worked on a Sachs 3 x 7 hubs to answer a question about re-assembling one of these hubs. I have an extra flat washer that does not show up in any schematics I have found for the hub. If anyone comes forward as having some knowledge / experience, they can either reply to my post in mechanics or let me know and I can post more details in this forum.
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Old 09-12-12, 06:48 PM   #2
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Did you check at hubstripping?
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Old 09-12-12, 08:49 PM   #3
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& Aaron's bike repair in Seattle is up on doing IGH repairs.
You up to some shipping?
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Old 09-12-12, 11:32 PM   #4
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http://hubstripping.wordpress.com/20...le-dynamo-hub/
A quick search here gave me nothing but you could try yourself and also read if somebody asked about it on the page.

Arons bbikerepair: Yes, absolutely but I doubt it is nescesary to mail it to him if you managed to do that much yourself. Aron is a member of the Yahoo group for hub geared bikes http://groups.yahoo.com/group/Geared_hub_bikes/

There are other sites also http://www.all-about-hubs.com/start....=naben_galerie but I suggest you start at the Yahoo group. I would be suprised if you can not find a "exploded wiew" drawing of this hub (or one that is close enough) on the net, it is just about being smart or being lucky. Maybe some sort of name/number of the hub could be useful for searching.

Edit: Could this be what you need? http://www.greenspeed.com.au/pdfs/sachs_3x7.pdf

Keep us updated!

Last edited by badmother; 09-12-12 at 11:38 PM.
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Old 09-13-12, 04:40 AM   #5
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Thanks for all the good leads.
I can do the work myself, but ran into the problem of having a washer that is not shown in the exploded drawing that Sachs / Sram have in their manual. The same drawing that badmother linked to is posted on Aaron's along with the exact hub in pieces http://www.rideyourbike.com/sramIGH.shtml (scroll down to 3x7 Sachs). The washer in question is shown right below the axle. I wrote to Aaron's, but being in the business of fixing hubs, they charge for answering questions.
I'll try the yahoo group next, maybe some has run into the same situation.
I'll keep you updated.
Mike..
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Old 09-13-12, 10:01 AM   #6
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let me get this right, they know the anser, have emailed you back and asked for money ? I cant believe that, than again ....
email Sram, who bought Sachs ..they should get you an answer for free ....
If I would be sure what Ia m talkin about I would gladly help ...free

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Old 09-13-12, 03:02 PM   #7
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OP: Could you produce a good picture of the hub for us (do you have a fairly good camera)?
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Old 09-13-12, 03:23 PM   #8
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Do you want the outside of the hub or the parts? If you go to http://www.rideyourbike.com/sramIGH.shtml and scroll down to Sachs 3x7 it is exactly this hub. The washer is the one just below the axle. I'll take a photo of the outside.
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Old 09-13-12, 06:22 PM   #9
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Here is a picture of the hub. I roughly put it back together, didn't want to leave the parts in the dirty garage.
Attached Images
File Type: jpg DSCI0021.jpg (95.3 KB, 3 views)
File Type: jpg DSCI0023.jpg (89.2 KB, 2 views)
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Old 09-14-12, 12:57 AM   #10
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Edit: Sorry. Realised I looked at the 2x7 on Arons page. Need to look and think again.

Same suggestion as when I looked at the wrong picture. Is it a "stopper" in one end of the small (slim) spring in the picture? If you slide it onto the axel, where does it stop?

Last edited by badmother; 09-14-12 at 01:13 AM.
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