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newvibe

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Reply with quote  #1 
Hello everyone,

Can you please recommend any tools or have any tips of how to remove a fan NDE pillow block bearing (ball/spherical bearings) on an overhung fan? The NDE bearing usually stuck on the shaft and the back of the bearing is only a couple of inches away from the fan housing, make it difficult to use any force to knock it back. The length of the shaft range from 3-5 feet and the shaft size range from 2-4 inches.

At the moment, a grinder is used to cut it off but it usually damage the shaft.

Thank you.
Walt Strong

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Reply with quote  #2 
Have you considered some quick heat and a puller; like taking a coupling hub off shaft?

Walt
Noknroll

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Reply with quote  #3 
you can still use a grinder but don't cut all the way through, stop a mm or 2 before going all the way then crack it with a chizel. Really your mechanical guys should be all over this stuff, pullers and heat as mentioned before should all be in the mechanics repertoire
JuddJones

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Reply with quote  #4 
They can be torched off without damaging the shaft.
fburgos

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Reply with quote  #5 
It depends on the situation I think, multi flame torch, pullers, grinders and chizel are the tools.

As Noknroll said the damage using grinder is because the staff dont knowing when to stop.
Barry

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Reply with quote  #6 
I would never suggest the use of a cutting torch to remove a bearing from a shaft. 
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Barry
Walt Strong

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Reply with quote  #7 
I agree with Barry!

Walt
fburgos

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Reply with quote  #8 
Quote:
Originally Posted by Barry
I would never suggest the use of a cutting torch to remove a bearing from a shaft. 


Agree, Ive seen couple of melted bearings because someone try to cut them using a torch.
newvibe

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Reply with quote  #9 
Thanks very much for your advice and recommendations.

Which bearing puller would you recommend that would be long enough to reach all the pass the NDE that could be up to 4 feet and can work with the shape of a pillow block?

I was looking at the SKF strong back puller https://www.skf.com/us/products/maintenance-products/mechanical-tools-for-mounting-and-dismounting/bearing-pullers/strong-back-pullers but I think the pillow block housing will still need to be cut. I was hoping to get away with the grinder altogether.

Try not to cut into the shaft is still the best way going forward by the look of it.
JuddJones

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Reply with quote  #10 
Quote:
Originally Posted by Barry
I would never suggest the use of a cutting torch to remove a bearing from a shaft. 
If done correctly it doesn't damage or even overheat the shaft. It is definitely a skill though. 
Noknroll

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Reply with quote  #11 
Judd Jones
Agree, I've done a few with a torch when I was a nut spinner, same as the grinder, don't go all the way through
Edit: The torch is a last resort though, followed by grinder as second last resort
Sinski

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Reply with quote  #12 
Quote:
Originally Posted by Noknroll
Judd Jones
Agree, I've done a few with a torch when I was a nut spinner, same as the grinder, don't go all the way through
Edit: The torch is a last resort though, followed by grinder as second last resort

Nok

Used to do the same when I was a fitter. Always try the puller first with some heat and then you can try a grinder through the inner race without going all the way through and then a chisel to remove. The torch has been out in the past in emergency situations.
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