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Old 07-08-14, 07:07 PM   #1
kurtp13
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Got the cotters out...Can't remove the crank arms

I used the Harbor Freight tool to get the cotter crank pins out of my '64 Hercules but the crank arm are stuck on the spindle. I hammered a bit on a drift positioned on the inside of the arm where there seemed to be a divot location. But they are frozen pretty solid. I tried to heat up the arm a bit with a heat ***. And I sprayed PB Blaster on the inside bore and around the spindle to arm interfaces. Now I will give it some time and let it soak. Is there something else that I can do?

I expected a fight from the cotters, but not the arms themselves.
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Old 07-08-14, 07:38 PM   #2
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use something that transfers a hit over a longer period than a hard metal hammer, use a block of wood or a dead blow hammer. A sharp hit from a metal hammer has too quick of an impulse to move the crank arms easily where a dead blow hammer or hitting a piece of wood (along its length) transfers a longer impulse and helps get it off. Get the NDS off first to give more room for getting the DS off
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Old 07-08-14, 07:43 PM   #3
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Go for a bike ride leaving the pins out. Guaranteed to fall off. Bring a phone so you can get a ride home.
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Old 07-08-14, 08:01 PM   #4
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Go for a bike ride leaving the pins out. Guaranteed to fall off. Bring a phone so you can get a ride home.
Beat me to it. Not just funny, but true. Worked for me.
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Old 07-08-14, 08:30 PM   #5
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Beat me to it. Not just funny, but true. Worked for me.
Actually no, this will at best free one crank arm. But you're on the right track. Bring two new cotters with you; when one crank arm breaks free, put the cotter in and keep riding. When the second one breaks free, put on the other cotter and head home.
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Old 07-08-14, 08:31 PM   #6
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Go for a bike ride leaving the pins out. Guaranteed to fall off. Bring a phone so you can get a ride home.
Might as well ride to the bar and have a few if you're gonna get a ride home anyway......
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Old 07-08-14, 09:13 PM   #7
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I would try using either a gear puller


or a ball joint fork


Harbor Freight has gear pullers for $14 and ball joint forks for $10 on their website.
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Last edited by John Hood; 07-08-14 at 09:20 PM.
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Old 07-09-14, 07:25 AM   #8
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I had a Nissan pick-up that I drove to Belize, and ultimately left there. The trailer hitch had, at some point become one with the insert. We had it chained to a tree with a large tractor pulling it the other way, and someone wailing on it with a sledge hammer. It never budged. In your case I'd go with the ball joint fork, and hope for better luck that what I had.
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Old 07-09-14, 08:38 AM   #9
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Yeah! Pullers or forks can get you some excellent resulsts:
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Old 07-09-14, 09:08 AM   #10
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A bearing splitter may enable the use of a puller without damaging the crank.



Otherwise I like the idea of putting two spare cotters in your pocket and going for a ride. DON'T however, stand on the pedals!!!
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Old 07-09-14, 09:14 AM   #11
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Quote:
Originally Posted by rhm View Post
Actually no, this will at best free one crank arm. But you're on the right track. Bring two new cotters with you; when one crank arm breaks free, put the cotter in and keep riding. When the second one breaks free, put on the other cotter and head home.
This^ best advice (short of the special/modified/kludged automotive/machinist tools)
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