Roller axle bearings are lubricated by the gear oil in
the axle housing. Therefore, only a seal to protect the
brakes is necessary with these bearings. These bearings
are typically pressed into the axle housing and not onto
the axle. To remove them, the axle must first be removed
and then the bearing pulled out of the housing. With the
axle out, inspect the area where it rides on the bearing for
pits or scores. If pits or score marks are present, replace the axle.