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Removal and re-installation of tapered cups/bearings.

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koolio
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PostPosted: 14:25 - 10 May 2013    Post subject: Removal and re-installation of tapered cups/bearings. Reply with quote
I have new tapered bearing and cups in one frame, there is no way to knock out the cup for the tapered bearing as it sits wider than the lip of the head stock tube (unlike the standard OEM cups which you can knock out with a drift).

Question is this, is there a way to safely remove a tapered bearing cup and re-install them? I read somewhere that there is a specific tool for doing so and one that is used for example when people want to send a frame off for powdercoating? Where the cups/races are removed and then reinstalled after the powdercoat.
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Islander
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PostPosted: 14:29 - 10 May 2013    Post subject: Reply with quote
A bearing puller would probably do the job.
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koolio
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PostPosted: 14:53 - 10 May 2013    Post subject: Reply with quote
Herein lies the problem:

The red line is the diameter of the inside of the headstock tube.

And the blue line shows the inner edge (roughly the diameter) of the tapered bearing cup.

There is no way I can see to push out the bearing cup as its diameter is greater than that of the headstock tube, is there such a tool that can deal with this?

https://i747.photobucket.com/albums/xx115/accjnt/Bearing/IMG_3659_zps71c333c0.jpg
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Aff
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PostPosted: 15:00 - 10 May 2013    Post subject: Reply with quote
Cut a groove in it, then hit the groove with a chisel, should relieve the pressure so you can pry it out.

Works really well on external bearings, but I have also removed internal bearin races with this method fairly successfully.
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stirlinggaz
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PostPosted: 16:45 - 10 May 2013    Post subject: Reply with quote
Aff wrote:
Cut a groove in it, then hit the groove with a chisel, should relieve the pressure so you can pry it out.

Works really well on external bearings, but I have also removed internal bearin races with this method fairly successfully.

hi,
unless im not reading this correctly, the op wants to remove the bearing & then re-use it, no?

never done this with bearings before, just tyres,plastic bits etc (& covered up all threaded parts with old bolts) when sending off frames/forks & other bits to be powder-coated.

i also would be interested in any tool that can remove tapered bearings (like those in headstocks) like these https://www.ebay.co.uk/itm/Headstock-Bearing-Set-Suzuki-RG125-UN-92-95-/221014590536?pt=UK_Motorcycle_Parts_13&hash=item33757f0448
due to price & unavailability of some. (as in older bikes which have cups & ball bearings & i want to replace with the above type)

i guess it would be some sort of slide hammer/bearing puller?
tbh, never really looked into it as its the kind of job you do once in a blue moon & the cost of any tool would mean its not a worthwhile investment?

cheers,
GAZ
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Aff
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PostPosted: 16:57 - 10 May 2013    Post subject: Reply with quote
stirlinggaz wrote:

hi,
unless im not reading this correctly, the op wants to remove the bearing & then re-use it, no?


My bad, didn't read the question properly.

Although I don really understand why the OP is trying to remove and reuse a bearing cup, best practice to replace them with the bearings.

The tool used to remove them is kind of like a reverse 3 arm puller with either a thread or slide hammer attachment, and cost about £30-40 so would probably be better to just replace the cup.
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koolio
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PostPosted: 17:24 - 10 May 2013    Post subject: Reply with quote
Aff wrote:
stirlinggaz wrote:

hi,
unless im not reading this correctly, the op wants to remove the bearing & then re-use it, no?


My bad, didn't read the question properly.

Although I don really understand why the OP is trying to remove and reuse a bearing cup, best practice to replace them with the bearings.

The tool used to remove them is kind of like a reverse 3 arm puller with either a thread or slide hammer attachment, and cost about £30-40 so would probably be better to just replace the cup.


Reason being is I have new bearings and new races installed, I am now modifying the frame and would eventually like to powder coat the frame when the project is completely finished all weldings done etc.

Back to the question at hand:

I don't know how a puller is going to work given the photo which shows the very problem I'm trying to to get at.
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Aff
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PostPosted: 17:34 - 10 May 2013    Post subject: Reply with quote
So does the cup need to be removed for any of the modifications? Or just for the powder coating?

If it is just the powder coating then I wouldn't bother, as you will have to plug the hole anyway so may as well just make a plug to cover the cup as well.

If you need to remove for modifications and aren't worried about paint, etc. I imagine it will come out with some heat fairly easily.
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koolio
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PostPosted: 17:49 - 10 May 2013    Post subject: Reply with quote
Well really just the powder coating. But I still would like to know how to do it properly without damaging the cone if its possible.

Removing the standard OEM ball bearing cones with causing damage is fairly easy with the right puller, it was a complete oversight for me when I installed the cones for the tapered bearings Rolling Eyes
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Grubby
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PostPosted: 18:00 - 10 May 2013    Post subject: Reply with quote
You can safely leave the cup in for powder coating. Degrease it thoroughly & mask it off well & you should be ok. If you try to remove it chances are you'll bugger it. When I have to remove bearing cups like that I use a die grinder & burr to cut a groove in it to release the pressure. They come out easy then. Thumbs Up
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yen_powell
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PostPosted: 19:12 - 10 May 2013    Post subject: Reply with quote
https://i853.photobucket.com/albums/ab92/smack_ph/BB/JT5H8825.jpg
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koolio
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PostPosted: 20:00 - 10 May 2013    Post subject: Reply with quote
Quote:
Degrease it thoroughly & mask it off well & you should be ok.


Trouble is the race sticks out higher than the neck of the head stock so masking it over won't be that easy

Quote:
When I have to remove bearing cups like that I use a die grinder & burr to cut a groove in it to release the pressure. They come out easy then. Thumbs Up


Well this I do know how to do but it's exactly what I don't want to do.

Don't know how the image below will help on anything other than standard ball bearing cups.

yen_powell wrote:
https://i853.photobucket.com/albums/ab92/smack_ph/BB/JT5H8825.jpg
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yen_powell
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PostPosted: 20:36 - 10 May 2013    Post subject: Reply with quote
koolio wrote:


Don't know how the image below will help on anything other than standard ball bearing cups.

yen_powell wrote:
https://i853.photobucket.com/albums/ab92/smack_ph/BB/JT5H8825.jpg
I used exactly one of these (with a slide hammer) to remove the race inside an FJ1200 headstock which also has no lip to drive against (Also on an XT225 Serow, must be a Yamaha thing). As the tool is expanded the lip forces it's way under the race, then the slide hammer pulls it out.
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koolio
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PostPosted: 22:40 - 10 May 2013    Post subject: Reply with quote
Ah ok my apologies. Where can I get one and will it damage the cup upon removal?
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Grubby
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PostPosted: 19:47 - 21 May 2013    Post subject: Reply with quote
https://www.ebay.co.uk/itm/BERGEN-Pro-5-Piece-Inner-Blind-Bearing-Puller-Set-NEW-/390404587484?pt=UK_Hand_Tools_Equipment&hash=item5ae5ed3fdc
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