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How to get a seized threaded crank bearing cup out of the frame

Still working out it with no luck and a lot of fustration tried breaker bars wont move but can see the frame twist tried punching with the brass punch and hammer anybody got ideals

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  • charles beach
    charles beach Apr 21, 2014

    dont no what else to say or to do i wonder if this would fall under schwinn life time warranty if it wont come out it makes the frame useless



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Which side is the cup?

If it is gear side, don't forget that it is likely LEFT HAND THREAD so will come undone clockwise ...

Posted on Apr 23, 2014


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SOURCE: So my Dynacraft Next turbo

the little balls are the bearings, ie: ball bearings, so they are the size, take them to a bike shop and get a replacement kit.
Your crank is probably not bent , it takes a big crash or something to bend one. there is an adusjment nut and lock nut to set them back up. could be LH thread on the left hand side

Posted on Jun 03, 2011

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The crank on my bike is bent so im trying to get the pedals off of my schwinn z force bmx bike but i dont know how. was wondering if you could help?

Hi, As your BMX has 3 piece cranks. Here is how to go about it:

1. Unscrew the plastic cap on the side of the crank - driveside.

2. Take your 14 mm socket and ratchet, unscrew the bolt that holds the crank to the axle. Remove the bolt of both cranks(Left and Right). You can squeeze the handle of the ratchet and the crank together like pliers to give you more leverage.

3. Take the puller and screw it's socket inside the threaded hole of the crank. Hold the crank and turn the puller handle clockwise until the crank arm falls off from the axle by itself. Remove both crank arms.

4. Go to the left side and with the pliers firmly held with both of your hands(This is where the pictures differ, I'm taking a picture at the same time.), unscrew the lockring from the bearing cup.

5. Now again firmly with both hands, grab the bearing cup with the pliers and slowly test the resistance. You do not want to slip here since this will definitely strip the thread on that cup. Hold those pliers hard and go slowly, it should get it going within a quarter turn and then you should be able to unscrew it with your fingers. If not, keep on going and be careful. Remove the cup.

6. Remove the axle and bearing crowns from both sides.

7. Remove the right side bearing cup by unscrewing it in a clockwise fashion. The notch are not very wide, so might have to hold the pliers on the cup with one hand and the handles with the other. Be aware that this cup is often very hard to remove. Again, you can always purchase a specialised wrench just for that purpose.

8. Clean and inspect everything. What you are looking for is a clean and even line on the axle and inside the bearing cups. Any pits in that line will damage the bearings and they will eventually self destruct. Replace any parts that need replacing.

9. Regrease everything, the axle, the cups and the bearings. I use regular green axle grease with a touch of white teflon grease. Make sure that everything you've pulled out of that frame is extra clean, including the hole in the frame where it came from. The most minute piece of dirt can ruin your repack job.

10. Start by installing the right side bearing cup. Screw it in counterclockwise real tight. Insert the bearings and the axle. Insert the bearings in the left bearing cup and screw on the frame. Screw it until you feel resistance. Test to see if the axle turns freely and tug it up and down to see if there is any play. No play? Turns freely? If the answer is yes to both questions, install the lockring on the left bearing cup.

11. Reinstall the crank arms tightly. I would check them again in a few weeks to be sure. When you think it's tight enough, tighten some more. That's it, you're done.

Hope this helps and please vote if so :)

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If you have no clue of what the first part of the directions are please don't try this. Taking everything apart can just make a bad problem worse.


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