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dura ace bb maintenance Q..(6 posts)

dura ace bb maintenance Q..joe mudd
May 12, 2003 10:36 AM
anyone have some good info on maintenance proceedures for a splined dura ace sealed cartridge bottom bracket?

since this unit is sealed, i'm not certain of which areas to clean and lube (besides threads).

also , any good installation techniques/tips ( other than described by shimano)?
thanks for reading!
Are you sure it is sealed?LC
May 12, 2003 11:01 AM
The only ones I have seen is for track racing are not very common. If you have a 7700 then it is not sealed, but does have "seals" that don't really work at all.

Try pulling it appart by grabbing each side of the shell and pull! Might want to hold it over a container to catch the water that will come pouring out ;)

If it really is sealed then just make sure all the threads have grease and reinstall it.
That was going to be my answer,TJeanloz
May 12, 2003 12:04 PM
Except that there is a fully sealed, non-track, cartridge Dura-Ace bottom bracket - BB7703 - for the Dura-Ace triple crankset. BB 7700 is sealed, but not cartridge as the original poster said his was, so I presume he's operating either with the track (7710) or triple (7703) bottom bracket, which has no maintenance requirements beyond proper installation.
its a 7700...joe mudd
May 12, 2003 2:13 PM
thanks for the correction on the bearing type( mutli bearing , not sealed).
shimano europe has a pretty good section on bb maintenance.

i'm transferring components to a new frame, and would like to properly clean,lube and install bb. any hands on advice
would be much appreciated.

one thing to note on the d-a bottom bracket is the lock ring continually loosened up every few months last season after installation from LBS .

this also happened on my girlfriend's bike, and to many other cyclists i've talked with who are running dura ace.

one person said he switched to an ultagra bb and the problem resolved.

anyone find a good set up to properly torque lock ring
and should grease or (medium) locktite be used on lock ring?
The seal is a joke, pops off easily. Have to be careful withPaul
May 13, 2003 5:16 AM
the BB. I've taken it completely apart, bearings and all. cleaned it, re-greased, and re-installed. Bearings are held in by a retainer ring, easily removed but if not careful, bearings all over the place. I took out the needle and rollar bearings, just sit in a plastic cage, greased the cage/bearings, and they will stick in place.

I wouldn't take it apart if it's running okay, for 45.00 I would just replace it if it's giving you problems. Actually, better off with the Ultegra version.
yep, i've heard that about going with ultegra..joe mudd
May 13, 2003 9:50 AM
as it proves more reliable, and requires less maintenance over the d-a version bb (and the lock ring remains secure!).

since the bb on my bike is still in fine condition, i plan to swap over to new frame, yet i'd like to regrease bearings prior to installing if it looks needed.

thanks for the sound advise! i'll definitely use caution on disassembly of bb from the old frame, and inspect the unit to determine if maintenance is needed prior to installation on new frame.

also,wondering if you had the prob with with the lock ring loosening on your d-a bb
-ds