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Derbi gearbox bearing replacement.

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Derbi gearbox bearing replacement.

Ongelezen berichtdoor Derbir100 » za 09 jan 2021, 22:44

Hi guys. Sorry to use English. I'm just rebuilding my block and I'm wanting to change out the gearbox bearings. What tool do I need to pull the small roller bearing out of the case?
Many thanks and happy riding
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor 42 » za 09 jan 2021, 23:46

You mean the one you cant get out from the other side ?

There are special tools for that or you can use bread.
Or i was told anyway, didnt try it yet.
You put some bread in the roller bearing and some metal part which fits in the bearing like a cap or something and than you tap with a hammer on it, more bread, repeat and repeat and it should come out.
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor bart_rs2 » zo 10 jan 2021, 10:32

Bread wont work with the rollerbearing. I got out by welding a nut in it, heating the aluminium up and extracting it with a bolt.
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor Derbir100 » zo 10 jan 2021, 12:39

Yes that's the bearing I mean. I may just have to leave it
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor Brommert_01 » zo 10 jan 2021, 23:46

I haven't changed that one myself, but cant you Heat the bearing up, jam a large Bolt in there, let IT cool off to shrink the bearing, Heat the engine casing and try to pul the bearing out with the Bolt?
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor MennoVE » di 12 jan 2021, 16:42

Derbir100 schreef:Hi guys. Sorry to use English. I'm just rebuilding my block and I'm wanting to change out the gearbox bearings. What tool do I need to pull the small roller bearing out of the case?
Many thanks and happy riding


I think you mean a bearing you can't hammer out? if so i think the tool is called a ''blind bearing puller'' i don't know if you meant that.
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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor Brommert_01 » wo 13 jan 2021, 19:21

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Re: Derbi gearbox bearing replacement.

Ongelezen berichtdoor MennoVE » wo 13 jan 2021, 19:51

Yep that's it, you never konw what you might use it for but a cheap set will work for this.
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