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Old 10-04-10, 02:07 PM   #1
Xilliah
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Stuck with Disassembling Nexon Gear Hub

Hey guys,

I have a Nexus Inter 7 7R42 gear hub.

It was acting up, it wouldn't "grab" the gear, or stick inbetween. Can I fix this by simply adjusting the cable?

Either way, I was already on my way to grease the entire thing, and I read that I should disassemble it, clean it, dry it, and grease it with Nexon hub grease.

I can't find any good explanation on how to remove the outside chain gear. It is absolutely stuck, and I think I have to get it off before I can remove the dustcap and get in deeper.

I am using these manuals:
http://techdocs.shimano.com/media/te...9830728738.pdf

This isn't exactly for my model but I understand it is almost the same:
http://www.sheldonbrown.com/nexus8/pages/12.htm

Pictures of my (lack of) progress, I can move the axis and the insides around, but the gear is totally stuck:
http://www.antoon-groenewoud.com/Dow...icture%201.jpg
http://www.antoon-groenewoud.com/Dow...icture%202.jpg
http://www.antoon-groenewoud.com/Dow...icture%203.jpg
http://www.antoon-groenewoud.com/Dow...icture%204.jpg

Back side, where the roller brake used to be:
http://www.antoon-groenewoud.com/Dow...icture%205.jpg


Sorry for the newbie question, but I don't have the money to go to a shop.

Thanks,

Antoon

Last edited by Xilliah; 10-05-10 at 06:05 PM. Reason: Mispelt
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Old 10-04-10, 04:53 PM   #2
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Most likely all you had to do was go through the cable adjustment as per instructions.

Those hubs are very durable and don't need service often. The bad news is if you damage or lose any parts while trying to service it, you may have a tough time sourcing them.

By the gear being "stuck", do you mean it won't turn or you can't remove it? It should only move in one direction anyway. It is held on by a snap ring that must be pried off, then the cog just lifts off.
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Old 10-05-10, 10:15 AM   #3
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Most likely all you had to do was go through the cable adjustment as per instructions.

Those hubs are very durable and don't need service often. The bad news is if you damage or lose any parts while trying to service it, you may have a tough time sourcing them.

By the gear being "stuck", do you mean it won't turn or you can't remove it? It should only move in one direction anyway. It is held on by a snap ring that must be pried off, then the cog just lifts off.
As you say, it is probably just adjustment, so I will put it back together immediately and see if that does the trick.

The gear works fine, I just couldn't pull it off to get to the insides of the hub. I'll try this snap ring ring prying idea out before putting the wheel on again.

Laters
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Old 10-05-10, 10:35 AM   #4
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no ''Nexon'' winning this spelling bee..
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Old 10-05-10, 06:07 PM   #5
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Oh I meant Nexus, sorry.

Well I didn't take the whole thing apart, I just put it back on. The entire bike is back together, but the cassette joint won't pull itself back... ??
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Old 10-07-10, 04:20 AM   #6
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The cassette joint is where the gear-cable attaches. The cable can obviously pull, but it can't "push" the lever back. I suppose the lever should pull itself back?
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Old 10-07-10, 10:05 AM   #7
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There is a return spring the single cable pulls against, that is the pull back.
on the hub end, spring missing or weak?
cable run have binding anywhere in its path..
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Old 01-24-13, 03:42 PM   #8
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I don't know if any of you will read this, but thanks for the help. That old bike lasted another 2.5 years!
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Old 01-24-13, 03:55 PM   #9
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Of course it's stuck with that PILE of dirt on there. Get out the WD40 and clean the outsides for starters.
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Old 01-24-13, 04:33 PM   #10
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Of course it's stuck with that PILE of dirt on there. Get out the WD40 and clean the outsides for starters.
I have a feeling you're responding to a query from several years in the past...
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