Originally Posted by rbw156
It it essential to replace the outer bearing race as I found this quite difficult on my trailer? Can I get away with leaving it in place and replace the bearing with the same make?
You should really replace the inner and outer. They will be matched at manufacture. However, I've seen two bins at Indispension, one holding the inner races and the other containing the outer tracks and they just pick one from each bin.
You shouldn't have too much difficulty changing the outer. You need a drift with a nice flat end so it doesn't slip from the bearing when you tap the little you can see of it. The hub may have recesses for positioning the drift. Chap the rear of the bearing track at opposite sides, one chap at a time. Replace it by tapping the outer on opposite sides until it is caught firmly in the recess, check it for level, place the old bearing on top of the new and place a block of hardwood on top of them both. Whack cleanly and check for straightness after each whack. If the old bearing gets set into the hub a short distance, it's an easy matter to turn the hub over and use the drift to remove it the same way as you originally did. Use the drift to give a final tap on its rim on opposite sides. It should sound very firm.
It goes without saying that you should never drive the outer into place by applying pressure to the inner. This will cause the rollers to damage the surface of the outer and inner tracks. You probably wont be able to see the damage but the the bearing will have a short life. If you have a suitable press to refit them, all the better.
An extra precaution. The edges of the bearing recess can be very sharp. If you wipe out the grease with you finger, take care. Personal experience.