Gallery, Projects and General > How do I??

How to change grease on sealed bearings?

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PekkaNF:
Situation is like this: I can buy just the right bearing, but it has wrong lubricant and wrong amount of it. I.E. I want low friction sealed bearing with very little high rpm grease.

Industry would just spesify the bearing, seal and grease and order a pallet load of them.

In priciple it is easy: Pop out the seal, wash and a dab of correct lubricant. Wrong. All has to be very clean and I have tried some mildly high speed (like hand routers) stuff and the rubber seal never goes back as good as original. It might look fine, but the lip rubs and generates heat.

This how-to-not:


Although this is interesting:


Starting from new design I could use one sided seal and arrange sealing othervise or put two back to back.

russ57:
 Could you use a hypodermic needle with some solvent to flush the old grease out? Through the rubber seal. Id think it would self-heal sufficiently. Then either inject the new lubricant, or maybe try that vacuum approach.. Hard to control the amount that way though.
Russ

-russ

David Jupp:
Some people make a business out of it...http://www.smbbearings.com/products/bearing-relubrication.html

PekkaNF:
Actually I have heard of that sort of services, that looks pretty specialized. I have heard some cases of a pallet of bearings nearing self life filled with fresh grease and sold. Don't knew if they went on agricultural or consumer stuff or just sold wheere ever.

Anyways, have been working with Ford focus 2006 pissing off cooloant from core plugs - at cylinder head between sparkplugs.

I might need to test this one soon or maybe I get lucky and find the appropriate bearing from the self.

Pekka

awemawson:
I've never tried, but is it not possible to ease the rubber seals out of a bearing and then re-fit them? I would have thought that is was  :scratch:

In which case just flush the bearing with the solvent of your choice (I'd use a WD40  or brake cleaner spray) then re-lube as needed

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