Dura Ace 7850 front hub grinding/washer problem, help needed

bing gordon

I decided to give the hubs a strip down as they were starting to sound a bit rough bit gritty. I noticed one side bearing cup was slightly rough under the bearings so I gave it a light sanding with wet & dry just to take the edge off it. Although it looks a tab rough in the picture it's quite smooth . It was then I noticed that one side has a black insert type black washer under the bearing rack and the other side doesn't (please see pictures)

https://www.flickr.com/photos/101456316@N07/


Is that normal or has is there a black washer missing that kinda tucks into a recess ? when I put it back together no matter how much twiddling I do I just can't get it to run smooth although all the bearings and cups are fine. And if there is a missing black washer what's it's actual title or were can I get one (any links would be helpful) .

bing gordon

Sorry, I forgot to ask , I can't seem to find 5/32 ball retainers for the front hub
like this ;-
http://www.ebay.fr/itm/Shimano-Dura-Ace-WH-7850-1x-Retainer-Ball-Bearings-Y4BN98030-Front-Hub-Part-/251618716790
Also , do I need the retainer or can I use loose bearings ? if loose are OK do I use the same size and how many ?

dgunthor

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19639211#p19639211]bing gordon[/url] wrote:

Sorry, I forgot to ask , I can't seem to find 5/32 ball retainers for the front hub
like this ;-
http://www.ebay.fr/itm/Shimano-Dura-Ace-WH-7850-1x-Retainer-Ball-Bearings-Y4BN98030-Front-Hub-Part-/251618716790
Also , do I need the retainer or can I use loose bearings ? if loose are OK do I use the same size and how many ?

loose should be fine, as many as will fit in.

have a look on shimano tech docs to see exploded view of hub/axle if you want to check parts that should be there and/or part numbers

bing gordon

Thanks, I took a peek but there's no mention of any washer "under" the bearing retainer so I don't get why one side has one hasn't. I changed the bearings for new and for now kept the retainer and re-greased and they seem fine now.