The Wolf wrote:
Replaced the arbor bearings a few weeks ago and now they are making noise
again. They can't be worn out already, what else could cause the noise?


Was the noise gone immediately after replacement but now it's back again?

If so, I'd say you either have a severe misalignment, _way_ too much
belt tension or similar problem causing a premature failure or as Lew
says, screwed 'em up in the replacement process....or, the bearings
weren't and aren't the noise in the first place. But, what specifically
was a noise is pretty much indeterminate from here w/o knowing what it
sounds like or anything else--perhaps, it's simply normal or the motor or...

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