1. Check the front bearing.
Rotate each bearing by hand while applying an axial force towards the center of the armature.
If excessive resistance is felt when the bearing rotates, or if the bearing seizes, replace the bearing.
2. Replacing the front bearing (if necessary)
A) Remove the bearing using a puller.
b) Using a press and a drift, press in the new front bearing.
3. Check the rear bearing.
Rotate each bearing by hand while applying an axial force towards the center of the armature.
If excessive resistance is felt when the bearing rotates, or if the bearing seizes, replace the bearing.
4. Replace rear bearing if necessary.
A) Remove the bearing using a puller.
b) Using a press, press in the new rear bearing.