Crank Nut Coming Loose

They do that. Keep an eye on it and keep tightening it.

You could give it a good clean and put some threadlock on it. That'll
help but they still sometimes just come loose.

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nickjb
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Keldridge said:

Is there something else I could use to keep it in place?

[image:
http://ec3.images-amazon.com/images/P/B0002KKTHM.01-ADG953YR6NRBF._AA280_SCLZZZZZZZ_.jpg]

LOCTITE THREADLOCKER

Make sure to get medium strength (242). If you get anything stronger
you'll have a very hard time getting the nut off in the future.

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maestro8

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thread locker will help

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picado

###unicycle for JAH RASTAFARI###

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Thanks all... I'll give it a try...

🙂

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Livewire Unicycles has a 'technical guide on how to install square taper
cranks' (http://tinyurl.com/blcbl). It explains a proven method for
getting square taper cranks tight so they won't come loose. He says to
go to 40 foot-pounds. I don't go above 35 foot-pounds.

The secret is the torque wrench and the use of Loctite. That
combination will get the cranks tight and they will stay tight. You
can get a suitable 'Craftsman torque wrench' (http://tinyurl.com/w8abn)
for $25 or less if Sears is having a tool sale.

I have not had a crank come loose on me since using the torque wrench
and Loctite method.

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I've always used a rubber mallet to pound the cranks on before
installing the nut (this is primarily on bikes). I just do it to seat
the crank fully onto the hub's taper. Is this a bad idea? I've not
needed loctite, either, but maybe that's due to luck.

--
pkittle

*========
Peter Kittle
Chico, CA
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pkittle said:

I've always used a rubber mallet to pound the cranks on before
installing the nut

One problem with using a hammer or mallet to do such an installation is
that you're applying forces that are not parallel to the hub, possibly
damaging the cranks (i.e. creating "slop" between crank and hub). This
is why a press is the recommended method of installation.

Of course, using a rubber mallet is better than using a mallet, and
using a mallet is better than nothing, but it's not the ideal solution
to the problem.

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Had that exact problem on my 36.
Changing the cranks didn't help at all; riding about 5km was enough to
bring the cranks from 'set on and torqued on hard at the LBS' to
virtually falling off, on the second cranks, twice; the first one, it
got loose at a gathering after a short bit of riding to get used to it,
the cranks were set on and torqued on hard while I was there, and the
crank fell off riding the 1k home.
Me, UDC, and the LBS finally decided it was some flukish defect in the
hub, UDC replaced the wheelset and i've had no issues since.

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JusticeZero
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