Crank removal

[ian slater]

Hi everyone
I am fitting a conversion kit to a specialized hardrock, came to fit the pas sensor and tried to remove the crank.Have a crank extractor which outer part screwed in fine then screwed inner part in but it just bottomed out.Looked through the crank but hollow. Do you have to have a different tool to extract crank on this particular bike.
Thank you

 

[Sturmey]

I am assuming that your bike has the square taper type bottom bracket/crank. Some crank extractors come with a cap as shown below but I have seen the caps a little too large for the square hole. I always use a small m6 bolt with the head filed a little smaller. But a nail with large enough head or washer with a small hole should do the trick. It should be just big enough to go flat through the square hole in the crank.

 

[ian slater]

Evening Sturmey
I'm pretty sure i know what you mean, so just need to put something inside for the centre part of crank extractor to push against when tightening it and this will then release the crank
Thanks

 

[saneagle]

Hi everyone
I am fitting a conversion kit to a specialized hardrock, came to fit the pas sensor and tried to remove the crank.Have a crank extractor which outer part screwed in fine then screwed inner part in but it just bottomed out.Looked through the crank but hollow. Do you have to have a different tool to extract crank on this particular bike.
Thank you

Yes, there are special ones for that, which have a larger part that presses against the end of the crank.

I've done it by inserting a washer or two into the hole, but it really needs to be a thick strong washer, otherwise it'll bend.

 

[ian slater]

Hi Saneagle
On hand again to help me,thank you once again
Regards
Ian

 

[Raboa]

I have never used the company in the lists but it gives you an idea.

Park Tool CCP-22 - Cotterless Crank Puller

The benchmark crank puller of the cycle industry for over 25 years The CCP-2.2 uses a long comfortable handle and extra fine thread that provides the leverage required to remove even the tightest cranks Unique floating-tip design has been updated over the CCP-2 and ensures even smoother...

www.bikeparts.co.uk

Park Tool CWP-7 - Crank Wrench and Puller

The CWP-7 is a compact crank puller with a built-in 8mm hex for removing crank bolts Includes two rotating tips (11.3 mm and 16.3 mm) so it can be used to remove splined Octalink and ISIS Drive crank arms, as well as square-holed crank arms A must have multi-fit crank puller for the home...

www.bikeparts.co.uk

 

[ian slater]

Morning Raboa
Thanks for sending these,can you remove crank arms individually only i want to remove non drive one just to fit a pas
Regards
Ian

 

[Waspy]

Be careful, it's easy to strip threads on this job.

 

[Raboa]

Yes, you can remove each arm individual.

When I remove my crank arms, I give the end of the bottom bracket shaft (square bit) and the square hole in the middle of the crank a quick wipe with isoprayal acholol. It's worth removing both arms at once for this reason.

Some of the crank extractors (2nd picture in message) have less threads on them. I found the Park one to be better as it has more threads, both of the Park tools are good.

 

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