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PF-30: running out of ideas on removing DS crank arm

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PF-30: running out of ideas on removing DS crank arm

Old 12-10-16, 01:05 PM
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cuski
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PF-30: running out of ideas on removing DS crank arm

So, after my last CX race in gruelling conditions, I decided to clean and regrease the bottom bracket. I removed NDS crank arm, there was a crap load of gunk in there, cleaned it. This is a FSA Gossamer crank.

Now, theoretically, I should just be able to push the DS crank arm out, but... no dice. I'm assuming it's perhaps seized against the bearing? I tried freezing the axle, and hammering it out, I also tried spraying some WD40 between the axle and the bearing. I hammered the crap out of it. Eventually I gave up.

The good news: after putting it together, it's running fine now. The bad news: it irks the crap out of me, and I'm running out of ideas on how to remove it, for when I'll decide to replace the BB. Taking it to LBS is the last resort.

Any other ideas? Am I missing something?
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Old 12-10-16, 01:15 PM
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Sounds like the LH bearing is pretty tight on the spindle, really tight. Maybe corroded. There are small tolerance differences between different brands of cranks (and their spindle diameters) and Bb bearing IDs. Shimano spindles (of the same "size") tend to run slightly smaller in actual diameter then others do, as example.


We've had some really tight combos where we've had to really wail on the spindle before it started to move within the bearing. A block of wood between the spindle and the hammer is a good idea. We try to match up the brands between crank and BB whenever possible to limit this. Andy.
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Old 12-10-16, 04:22 PM
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Originally Posted by Andrew R Stewart View Post
A block of wood between the spindle and the hammer is a good idea. We try to match up the brands between crank and BB whenever possible to limit this. Andy.
That's basically what I've been doing, I didn't want to damage anything. This is the factory set up, so it's probably an FSA bottom bracket to match the crankset. Problem is I don't have a "feel" for how hard is should be hammering the thing, especially since it's a carbon frame.

I guess I'll be taking it in...

Thanks, Andrew!
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Old 12-11-16, 09:55 AM
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I may be wrong here but if it's a PF30 then the method of removing the BB is to use a slide hammer. So worst case beating really hard on the crank spindle should only remove the BB. So I think I'd just be careful of damaging the crank and hit it harder.
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