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Removing a stuck crank?
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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#2
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Removing a stuck crank?
On Oct 7, 5:26 pm, 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? yes: http://parktool.com/repair/readhowto.asp?id=103 |
#3
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Removing a stuck crank?
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 |
#4
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Removing a stuck crank?
RF 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 |
#5
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Removing a stuck crank?
On Oct 7, 7:06 pm, A Muzi wrote:
RF 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! |
#6
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Removing a stuck crank?
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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