Change the ball bearing? This should be done, when …
the bearing clearance caused by wear has reached an unacceptable level, for example, when the shaft “sags”.
the cage is worn and in danger of falling out.
Grease or lubricating oil is essential for installing metal ball bearings. With xiros polymer ball bearings you can enjoy 100% lubrication-free ball bearings made of plastic. No grease No oil No residues on hands or machines!