" That one will be a press fit onto that eccentric shaft. Small bearings like that are easy to drive off with a suitable punch or mandrel. Simply stand it up in the jaws of a vise so the jaw edges contact the outer rim of the bearing and use a hammer to drive it out. Put a washer or similar bit of metal between the shaft end and the punch to protect the face."
Make sure before you put the new bearing on that the shaft is clean and smooth.