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Main
Date: 07 Oct 2007 22:26:30
From: RF
Subject: Removing a stuck crank?
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Hi Experts,
I want to clean out and regrease the crank bearings of my bike. However,
one crank is really stuck. I forced a steel wedge in behind the hub of
the crank with a hammer but it won't budge.
It might be possible to whack the axle that joins the cranks, but I
doubt that the ball bearings would like it.
Is there a puller for these, just like a pulley puller?
TIA
RF
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Date: 07 Oct 2007 18:45:05
From: landotter
Subject: Re: Removing a stuck crank?
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On Oct 7, 7:06 pm, A Muzi <a...@yellowjersey.org > wrote:
> > RF <R...@Den.con> wrote:
> >> I want to clean out and regrease the crank bearings of my bike. However,
> >> one crank is really stuck. I forced a steel wedge in behind the hub of
> >> the crank with a hammer but it won't budge.
> >> It might be possible to whack the axle that joins the cranks, but I
> >> doubt that the ball bearings would like it.
> >> Is there a puller for these, just like a pulley puller?
> landotter wrote:
> > yes:!!
> >http://parktool.com/repair/readhowto.asp?id=103
>
> I was impressed that a Campagnolo ACH is shown as the archetype! Cool!
Stronglight was also represented. I suggest a pirouette!
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Date: 07 Oct 2007 19:02:36
From: A Muzi
Subject: Re: Removing a stuck crank?
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RF wrote:
> Hi Experts,
>
> I want to clean out and regrease the crank bearings of my bike. However,
> one crank is really stuck. I forced a steel wedge in behind the hub of
> the crank with a hammer but it won't budge.
>
> It might be possible to whack the axle that joins the cranks, but I
> doubt that the ball bearings would like it.
>
> Is there a puller for these, just like a pulley puller?
If it is a right with a classic loose-ball BB, yes, it is possible to
remove the left crank and left cup then screw in a scrap m8x1 bolt and
smack the spindle out while the crank rests on the right cup. Watch for
chainring on chainstay if you try that.
A left may be removed with cup and spindle complete and similarly bashed
apart over a vise. A heat gun may be helpful.
I'd consider that a 'last option' when nothing else has moved it and as
noted on many setups it cannot be done at all.
Have you tried a good crank puller firmly mounted in clean threads and
with oil on the puller's bolt? A heat gun and/or tapping the side of the
arm while the crank puller is tight may help.
Wedging an arm off with a auto tie rod 'fork' can be done. We find the
tool's slope is to steep as delivered, lower (file, disc grinder) the
angle if you can.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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Date: 09 Oct 2007 02:57:56
From: RF
Subject: Re: Removing a stuck crank?
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A Muzi wrote:
> RF wrote:
>> Hi Experts,
>>
>> I want to clean out and regrease the crank bearings of my bike.
>> However, one crank is really stuck. I forced a steel wedge in behind
>> the hub of the crank with a hammer but it won't budge.
>>
>> It might be possible to whack the axle that joins the cranks, but I
>> doubt that the ball bearings would like it.
>>
>> Is there a puller for these, just like a pulley puller?
>
> If it is a right with a classic loose-ball BB, yes, it is possible to
> remove the left crank and left cup then screw in a scrap m8x1 bolt and
> smack the spindle out while the crank rests on the right cup. Watch for
> chainring on chainstay if you try that.
>
> A left may be removed with cup and spindle complete and similarly bashed
> apart over a vise. A heat gun may be helpful.
>
> I'd consider that a 'last option' when nothing else has moved it and as
> noted on many setups it cannot be done at all.
>
> Have you tried a good crank puller firmly mounted in clean threads and
> with oil on the puller's bolt? A heat gun and/or tapping the side of the
> arm while the crank puller is tight may help.
>
> Wedging an arm off with a auto tie rod 'fork' can be done. We find the
> tool's slope is to steep as delivered, lower (file, disc grinder) the
> angle if you can.
My thanks to everyone for their inputs.
Landotter, those were very good pictures and, while viewing them, I
vaguely remembered having bought a puller. I rooted through my bike
drawer and sure enough I unearthed one. It has the brand " Sugino, Chain
Wheel" and it worked extremely well. I had both cranks off in less than
10 mins. What the right tools can do! :-)
Thanks again.
RF
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Date: 07 Oct 2007 16:40:43
From: landotter
Subject: Re: Removing a stuck crank?
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On Oct 7, 5:26 pm, RF <R...@Den.con > wrote:
> Hi Experts,
>
> I want to clean out and regrease the crank bearings of my bike. However,
> one crank is really stuck. I forced a steel wedge in behind the hub of
> the crank with a hammer but it won't budge.
>
> It might be possible to whack the axle that joins the cranks, but I
> doubt that the ball bearings would like it.
>
> Is there a puller for these, just like a pulley puller?
yes:
http://parktool.com/repair/readhowto.asp?id=103
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Date: 07 Oct 2007 19:06:26
From: A Muzi
Subject: Re: Removing a stuck crank?
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> RF <R...@Den.con> wrote:
>> I want to clean out and regrease the crank bearings of my bike. However,
>> one crank is really stuck. I forced a steel wedge in behind the hub of
>> the crank with a hammer but it won't budge.
>> It might be possible to whack the axle that joins the cranks, but I
>> doubt that the ball bearings would like it.
>> Is there a puller for these, just like a pulley puller?
landotter wrote:
> yes:
> http://parktool.com/repair/readhowto.asp?id=103
I was impressed that a Campagnolo ACH is shown as the archetype! Cool!
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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