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Bottom bracket/crank question

Old 05-05-13, 04:55 PM
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Bottom bracket/crank question

Alrighty, I'm a new bike mechanic and I got a pretty basic question.

I'm tearing down an old rockhopper. On the bottom bracket, there's a bolt on the left. I took it off. A threaded piece on the right. I unthreaded that. Now what? I 'm not really sure how to get the cranks off.

Do I need a ecial tool or can I bang it off? I didn't want to mess anything up with my hammer unless I had to.

Thanks in advance for any help.

-jeremy
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Old 05-05-13, 05:08 PM
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How old? Do you know the model of the bottom bracket?
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Old 05-05-13, 05:11 PM
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Would help it you can ID the BB type you have, from your description, it sounds like square taper, if so, mallet, hammer, deadblow, take you pick, and hit it, it will come off.

You can read more here https://www.parktool.com/blog/repair-.../crank-service on crank service / removal. though, unless you have an external type, with the safety pin, there is normally only one bolt to remove on each side for Square taper, or ISIS/Octalink.
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Old 05-05-13, 05:13 PM
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Originally Posted by hamster
How old? Do you know the model of the bottom bracket?
bike is late 80s/early 90s. Cranks suntour. Bracket unknown. It looks like the left crank would slide off, but like I said I don't wanna just start whacking it with a hammer.
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Old 05-05-13, 05:16 PM
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Originally Posted by Jbone78
Alrighty, I'm a new bike mechanic and I got a pretty basic question.......
I agree with the new part

https://www.parktool.com/blog/repair-.../crank-service
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Old 05-05-13, 05:21 PM
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Old 05-05-13, 05:22 PM
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Originally Posted by Bill Kapaun
hardy har har.
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Old 05-05-13, 05:44 PM
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You need a crank puller. The Park tool page linked to above will cover all the details.

- Joel
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Old 05-05-13, 08:49 PM
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Thanks gang!
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Old 05-05-13, 09:15 PM
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That's a square taper crank and you need a crank puller for square taper. $10 to $15 and an easy job. Or...whack with a hammer and maybe get a new BB. Your choice.
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Old 05-05-13, 09:30 PM
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Sometimes I find it hard to comprehend how certain questions make their way to the forum. I would think that if you know the term bottom bracket it would be an obvious next step to search for repair/disassemble/remove/overhaul bottom bracket.
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Old 05-06-13, 05:53 AM
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Originally Posted by cny-bikeman
Sometimes I find it hard to comprehend how certain questions make their way to the forum. I would think that if you know the term bottom bracket it would be an obvious next step to search for repair/disassemble/remove/overhaul bottom bracket.
Yeah, people these days. Geez.
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Old 05-06-13, 11:07 AM
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Alrighty, I got it!
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