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  1. #1
    Arschgaudi Mayonnaise's Avatar
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    Breaking Down A Proton Cassette

    Iíve got an older pair of Campagnolo Proton wheels. The freewheel cassette has frozen bearings that need to be replaced.

    I have successfully removed the outer sealed bearing cartridge (the one furthest from the hub) but cannot remove the second, inner bearing cartridge. I donít know how to get it out and I donít want to start using force.

    Iíve searched the campy website for directions but found nothing.

    Iím wondering if maybe I have to separate the cassette body from the piece that holds the pawls and spring.

    Anyone know how I should proceed.
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  2. #2
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    Sad to say but the freehub is not serviceable. They make it so you cannot remove the innermost bearing. Thats why you dont see the freehub bearings as a spare part on Campys website.

  3. #3
    Mr. Dopolina Bob Dopolina's Avatar
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    Correct.

    The bearings are not replaceable. If, however, you have the first bearing out, just remove the seal from the other bearing, flush and re-lube.

  4. #4
    Arschgaudi Mayonnaise's Avatar
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    fortunately for me, the frozen bearing is the outer bearing, so my problem is pretty much solved.

    My thinking was, if I’m going to the trouble of removing and ordering one bearing, why not do them both, as they are my cyclocross wheels and have been subject to hard use.

    Still, the cassette has to come apart somehow. Unless the piece that holds the pawls and the cassette body have been somehow bonded. Campy doesn’t authorize it but I bet there’s a way.
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  5. #5
    Mr. Dopolina Bob Dopolina's Avatar
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    Quote Originally Posted by Mayonnaise View Post
    fortunately for me, the frozen bearing is the outer bearing, so my problem is pretty much solved.

    My thinking was, if Iím going to the trouble of removing and ordering one bearing, why not do them both, as they are my cyclocross wheels and have been subject to hard use.

    Still, the cassette has to come apart somehow. Unless the piece that holds the pawls and the cassette body have been somehow bonded. Campy doesnít authorize it but I bet thereís a way.
    I'm a bit confused, here. The cassette (gears) will come off of the freehub when you undo the lockring. You can remove the freehub body from the hub pretty easily. The pawls and springs can be removed from the freehub body as well. The bearings inside the freehub body aren't meant to be serviced. (I really need to see your freehub as I am still having my morning coffee and my mental picture is a bit blurry. I also haven't had my face inside a proton freehub body in a while).

    If I recall correctly, you may be able to get the first bearing out with a puller. There is a spacer underneath that will fall out. Then there is a circlip holding the inner bearing in the freehub body. This is a PITA to remove. Once you get that out, you can just pop the two seals on the bearing, flush and lube. No need to remove the second bearing.

    This is not so easy to do. Have a look at what you have (pics would be nice) and see if that all makes sense.

  6. #6
    Arschgaudi Mayonnaise's Avatar
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    your mental image is precise.

    I tried removing clip but gave up as it was driving me crazy.

    Instead of going through the cassette body, I was considering going the other way. This would entail removing the piece that holds the pawls and spring; if the thing comes off. Which I don't know if it does. At one time they were two different pieces, so logic suggests they had to go together. Meaning, they can come apart.

    Perhaps they're bonded or otherwise secured so that ruining the piece could be easy to do if force were employed.

    I'm ready to give up and leave the damn thing as it is.
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  7. #7
    Mr. Dopolina Bob Dopolina's Avatar
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    Quote Originally Posted by Mayonnaise View Post
    your mental image is precise.

    I tried removing clip but gave up as it was driving me crazy.

    Instead of going through the cassette body, I was considering going the other way. This would entail removing the piece that holds the pawls and spring; if the thing comes off. Which I don't know if it does. At one time they were two different pieces, so logic suggests they had to go together. Meaning, they can come apart.

    Perhaps they're bonded or otherwise secured so that ruining the piece could be easy to do if force were employed.

    I'm ready to give up and leave the damn thing as it is.
    I had a look at a freehub body after I posted (at work). Nice to know I am not forgetting everything!

    As far as I know, the portion of the freehub body that holds the pawls and springs is not removable from the rest of the body. I have not tried this so I am only speculating but I am pretty sure about this.

    Oh, removing the circlip is a PITA isn't it?. I'd flush and lube the bearing you have already removed and see how it feels after that.

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