NAV wrote:
Oh and the bearings have only been in a year or so so shouldn't be worn.
it is not how long they have been in or how many miles. it is the fact that there was insufficient lubrication and/or misalignment due to improper torquing of the nut. they will likely last a little while if you remedy said issues, but i can guarantee they will be stuffed before long.
I love bearings. they are cheap and do wonderful things for the price, but only if you keep them lubricated and aligned properly.
I used to work in a factory where some machinery was installed with the grease nipples in the wrong place in the housing. The maintainers religiously pumped grease into the bearings at the recommended intervals, but it simply fell to the side of the bearing. needless to say we detected abnormal vibration and temperature in those bearings in about 3 months. It was only when we pulled the housings apart that we discovered the mistake. A couple of new bearings, moved the grease nipples to the right place and those bearings are probably still going strong today because they were regularly greased.
Another bit of machinery had a similar problem, but in this case it was made worse by white spirit used in the machine washing the grease out of the bearings. These required regreasing on a daily basis, but again the grease nipples were in the wrong place meaning the grease did not get to the bearing. They were lasting a matter of weeks when the loads they were experiencing would not have worn them out in 2000 years if they had proper lubrication.
get new ones when you can mate
cheers
michael
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