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If you have access to a oxy-acetylene torch you can cut the bearing off, of just heat the race up in a couple of spots red hot(when the cage has been removed)and then let cool for a while. Even though the metal has cooled the race will have stretched and should fall off, or at least come off easy. To get the new bearing on just heat up the race some all over but do not over heat it and it should just fall right on. I usually use the spit test to tell if the bearing is hot enough, spit on the bearing and if it bounces right off, the temperature of the bearing is just right.
I was thinking about open bearings, Ya don't heat the sealed one's. Try a puller to get it off , it helps if you clean up the shaft good. A punch or a bearing driver should work to get the new one on. You just want to hit on the race next to the shaft.
Since you said sealed bearing and collar then I assume your changing the axle bearings on your 9". The way I did it was to use a angle grinder to cut the outer race off. Knocked the ball bearings off and then used a dremel to cut 90% of the way through the inner race. Then just hit the cut with a chisel which will crack the race making it easy to remove. To get the collar off, you just take a chisel and hit it away from the bearing while keep turning it on the shaft.
To get the axle bearing off without a press you can cut with a torch or wrap a rag around the bearing and beat with a big hammer. The bearing outer race is strong but brittle so it will break apart with hammer blows. This isn`t the safest but it does work.
To get the bearing back on use a 4-5 ft long pipe that slides over the axle and use it as a slide hammer to hammer the bearing into place.
No problem, it`s not quite as bad as you think...Almost but not that bad when you`ve done it a few times cause there wasn`t another way to do it and it had to be done.
I`d sooner do that then climb high ladders for a living.
well...after all that, i had thought about the long pipe idea that was mentioned already, but i'd take 'er to someone with the proper tools and have it done right...
I drill a hole in the outer race and then take a chisel over the hole I drilled. This then splits the outer race in half. I do not get flying shrapnel every where. Usually after that the inner race does not take much persuasion to come off with a few taps also.
Putting on a new one I give the inner race a thin coating of grease to help slide into postion. I too use a pipe that fits over the shaft and tap on the pipe to press the bearing into position. The other thing is put the bearing on as far as you can and put in a bench vise with cardboard between the bearing and the vise surface. Tap the hub center of the axle to help drive the bearing in to place. Just have the axle snug in the vise not tight that the teeth will gouge the axle.
These are just some ways I have used. I will eventually get a press and avoid all the hassle.