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Bearings keep loosening up on coaster hub

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Bearings keep loosening up on coaster hub

Old 12-12-12, 12:29 AM
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sbs z31
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Bearings keep loosening up on coaster hub

I have a single speed Shimano coaster hub on my winter bike and the bearings keep loosening up after each ride. I have adjusted the bearings three times already and even adjusted the reaction arm twice. The reaction arm is strap next to the cahinstay and does not move when back pedaling. Is the coaster hub junk now?
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Old 12-12-12, 09:27 AM
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Coaster brakes do have a rough life sometimes. Possile issues with loosening up are. The lock nut/cone was never tightened enough against each other, this includes the left side too. The reaction arm is moving WRT the frame with each application of the brake. When tightning up the axle nuts (after setting bearing adjustment) the axle is spinning within the cones. The bearings are failing. One or more bearing was installed backwards so that the retaining ring is slowly collapsing. The rolling surface the bearing contacts (cones, driver shell) are wearing out. The axle is failing.

Have you taken apart this hub and looked at each part free of grime? This would be my next step. Andy.
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Old 12-12-12, 09:32 AM
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Wouldn't surprise me either if it turns out the drive side locknut is stripped.

Check that as well...

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Old 12-12-12, 10:28 AM
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Shimano is notorious for not tightening the non-drive side nut, allowing the hub to become loose after every ride. A stripped lock nut can cause the same problem. An entire rebuild kit shouldn't set you back more then $25.
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Old 12-12-12, 10:42 AM
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Thanks for all the suggestions and I have overhauled this hub before using. I adjusted the bearings again last night and rode into work finding the bearings be loose again. I'll just go pick up a brand new coaster wheel and be done with it.
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