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2001 CR250 Rear Wheel Bearing issue

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My rear wheel (brake side) bearing has stopped spinning smoothly only a few weeks after having installed it correctly. This problem has occurred twice now. The rubber seals seem to be in good shape and I have made sure the bearings are well greased before riding. I have been using brake cleaner to clean my wheel hub and bearings... Is using brake cleaner okay on bearings? Is there something better? Should I be removing the bearing seal and cleaning/greasing the inside often? 

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Just covering the basics here but are you using water proof grease? If not, that could be part of it as well. I do agree with Jtrain too

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Does it feel tight but smooth or rought with hard spots? Once you take the seal out it will never seal right again and makes the bearing susceptible to contamination . I keep the axle dust seals in good shape and dont pressure wash or the bearing area and I many many years of life out of wheel bearings with the original grease. I ride I. California though and there is not much mud or water .and as mentioned already keep solvents away

Edited by mec500
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Yeah that part is in place, however it's not totally secured in the hub... There is a tiny amount of play side to side. The bearing has totally seized up now. I'm thinking the rubber seal needs to be replaced even though is looks okay, I didn't replace the seals the second time I installed new bearings; they seem to fit loosely now. Could I redeem the bearing if i was to open the bearing seal and re-grease/clean?

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