> Over lubrication is the primary cause of premature bearing failure.
> > Check out lube recommendations on the bearing or grease manufacturers
> > web site. Depending on the capacity of your grease gun usually a
> > couple of shots periodically will suffice.
>
> Is that true? What damage does it do to the bearings? The worst I've
> seen is for the excess grease to squirt out and make a mess.
Too much greease in a high speed bearing can very easily cause it to overheat. Small 1800 rpm motors will have no problems with overgreasing other than the mess.
> Best wishes,
>
> Chris