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Dura Ace fh-7800 freehub

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Dura Ace fh-7800 freehub

Old 09-01-10, 06:54 PM
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Dura Ace fh-7800 freehub

My freehub body bearings are rough and I would like to replace them ($8.00 ea) rather than buy a new freehub ($130.00) Does anyone know how these come apart? I know the "regular" freehubs are threaded together. Possibly the steel pawl carrier is threaded or pressed into the aluminum body?
Thanks
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Old 09-02-10, 07:31 AM
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Nobody

I know some tech out there has to have broken one of these down just to "see how it works" especially at a shop where you have "old ones" laying around **********???
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Old 09-02-10, 07:47 AM
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FH-7800 hubs weren't that popular since they were 10-speed ONLY so it is quite possible no one here has actually take one apart. Even Shimano's Tech document doesn't show the freehub body details, only as a complete unit.

https://techdocs.shimano.com/media/te...9830608915.pdf

How do you know the bearings in the freehub body are replacable? The cost you quote sounds like they are cartridges but where did you get the price? If that's not the case, just dribble a lot of light oil between the stationary core and the rotating outer shell and that should correct the roughness.

If you are concerned with the hub bearings, they are just loose ball cup-and-cone type.
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Old 09-02-10, 12:10 PM
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The outter bearing is a standard sealed ball bearing available at any bearing supply (6803D). Don't know about the inner without getting it apart.
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