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Tractor Talk Discussion Forum

Bearing advice needed (kinda long)

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MH

01-13-2006 06:39:43




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I have an off-brand lite utility vehicle that I had to pull one side of the rear axle recently. The problem is that one of the axle bearings that pass through the frame was very difficult to remove (but I did without damage to the bearing). I see no way of putting it back on in its current state. To put it on I would need to press it on the axle. Unfortunatly I cannot put the axle back in the frame with the bearing on. Can I take the bearing to a machine shop and have the inside diamater increased by .001"? (to make it easier to slide on the axle) Or should I look for one that I can clamp down on the axle (the axle is 1" dia.)? Suggestions.
Thanks,
MH

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Don-Wi

01-13-2006 23:08:02




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
I'm guesing it's paint and rust that are your enemy here. I work at a machine shop, and we NEVER heat a bearing, doesn't matter what kind it is, just bad practice far as we're concerned. I'd polish the shaft first, that does the trick 99.9% of the time, the other .1% the bearing is junk and needs to be replaced. Bearings are made to slide with no clearance on the shaft, so any nicks, burrs, rust or paint will cause it to bind. The shaft has to be smooth. Could even have a machine shop put it in a lathe and polish it. It'll only take a minute and they'll MAYBE charge you $5, unless you are friends or a good customer, then they'll shrug and say "don't worry about it"

Once in a while we make a shaft to press fit into the ID of a bearing, but that is few and far between and something that fits in a press with ease.
Donovan from Wisconsin

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wdtom

01-13-2006 18:09:49




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
What the others have said, I agree with. You might also put the axle in the freezer for an hour or so before you heat the bearing, then work quick. Have all parts ready to go. The heat transfer can be quick and you want to have everything in place before it happens much.



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kenojoe

01-13-2006 10:28:18




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
Most bearings have a shrink fit of a few thousandths. If you are sure that the bearing is good, you can put the bearing in an oven and heat it up to 275-300 degrees and try it that way. Make sure that you have a pipe or something handy that will fit over the shaft that is no bigger that the inner race in case you have to swat it home. Some never-sieze on the shaft may help.



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MH

01-13-2006 08:02:18




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
Thanks for the advice so far. I might look up a couple of bearing houses. Paint could be the issue, I will take a look and see what cleaning up the shaft will do.

Thanks again.
MH



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Bob - MI

01-13-2006 07:06:48




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
It would be good to know what kind of bearing it is. I am going to assume that is a roller bearing. Yes, you can get it honed out at a machine shop but remember the inner race is very hard and will have to be honed or ground. You may have luck by finding a bearing house in your area that may be able to come up with a larger ID to allow you to slip this on. They deal with a zillion different sizes and I have found the counter guys to be pretty helpful. Overall bearings are pretty cheap.

Don"t know how this fits in the assembly but it may be possible for you to make a slide tool to help you seat the bearing. This would essentially be a sleeve that will clear the shaft OD but with enough clearance to slide freely. The od on this would contact the inner and maybe the outer race and allow you to tap the bearing into wherever it needs to go.

good luck with this

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supergrumpy

01-13-2006 06:58:32




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
if you are talking about the kind of bearings I see, the material will be very hard

why not turn down the axle shaft?, probably much softer metal

if you have some way of rotating it, you could use wet type sandpaper and reduce the size yourself, might just be a layer of paint or rust causing your interference issue

on 2nd thought, you might need that interefernce to keep the bearing in place unless there are snaprings or such

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Mike M

01-13-2006 06:57:13




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 Re: Bearing advice needed (kinda long) in reply to MH, 01-13-2006 06:39:43  
You should be able to take some off the axle so the bearing slides on. Try some emery cloth.



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TimS

01-13-2006 07:56:51




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 Re: Bearing advice needed (kinda long) in reply to Mike M, 01-13-2006 06:57:13  
Was the paint put on after the bearing was in place originally? You may have to remove a bit of paint to get it back in place ( as others have mentioned ).

You can also try heating the bearing a bit and then seeing if it will slip in place.



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