prob sealed for life bearings and effective lubrication is not possible .... never use WD-40 to lubricate anything ... it has usages but lubrication ain't one of them ( sold lubricants for Big Oil for 20+ years).
prob out of balance and I have had success correcting the problem with the balance kits about 75% of the time.
if it is one of the basic white builder grade fans that came with the casa ..... their is a very good chance that if the 75% balancing success rate comes through for you ... it is still only a matter of time before it is once again (and permanently) outta balance (bearings shot) and you will need to replace it.
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