Motor bearing replacement

[1carwash1]

Is it worth the time and effort to change the bearings on twenty year old 3 hp Baldor motors? Replacement motors are around $1000 and a set of replacement bearings cost around $20. The motors are currently installed on a plant that I am rebuilding and will put into service so it would be ideal to service them now. When operational, the motors worked fine. I just thought new bearings would extend their longevity. if Is worth it, what bearing type is best, unshielded, shielded, or sealed?

 

[MEP001]

It's not hard to replace the bearings. Ideally you would do it with a press, but I've done it with hand tools and a piece of aluminum C channel. I keep meaning to get a 12 ton hydraulic press from Harbor Freight, which is only $170, but they're always out.