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DA BB maintenance(7 posts)

DA BB maintenancenuke
Aug 28, 2001 5:15 PM
I know that DA BB are more finicky, etc. But I agree with grz mnky that with maintenance, they can outlast the others. So...my question is...how often should I service my DA BB? And what is the service? Is it - take it apart, clean, regrease and reinstall? Thanks...
re: DA BB maintenanceAtombomber
Aug 29, 2001 7:37 AM
How often you service it depends on the conditions that you ride in. If you only ride in the dry, you could possibly go a few seasons without having to service the BB. If you ride in all weather, then it will be more frequently. I suggest you remove your BB and inspect it. Most greases change colour when it gets old or contaminated. If you have never overhauled your DA BB, the original grease from Shimano is a green transparentish. The grease used when repacking also determines how long you can go between servicing. I use Finsihline white teflon grease for the bearing in my XTR (same design as DA), and then use Bullshot waterproof grease on the spindles (outside the BB shell) to create an extra seal.

Just be aware that there are lots of tiny needle and ball bearings in each cup. Borrow a cafeteria tray, layer it with shop rags and disassemble the BB above that, so that the bearings don't get lost.
Jahgrzy mnky
Aug 29, 2001 9:21 AM
It all depends on your usage and conditions. However, I would advise overhauling it a minimum of once per year. I usually do it during winter when it raining like crazy and I'm bored. The tray tip is a good one - lose some bearings and you're hosed.

I've been turned off by white lithium based grease for a while now. It's really not that bad, but I've seen Lubriplate get dried out and all cakey after a while - especially in harsh environments like salt water - may this never happen to you. Bought a tube of Phil grease years ago and continue to use it for everything. The stuff is almost magical - I've taken to bathing in it. ;-) Remember, a significant amount of water intrusion inside the frame comes from the seat post slot found on most frames and not through the seals on the end.
Jah, jah?Atombomber
Aug 29, 2001 10:02 AM
The grease I put around the spindle helps to keep water from getting inside the BB and into the bearing races. The water that gets in through the seattube etc should not get into the BB if the seals around the clear pastic sleeve are sound.
Jah, jah?grzy mnky
Aug 29, 2001 11:19 AM
That's a big "if" in my expereince ;-)

Having the water (and sand!) collect down in the BB shell makes intrusion possible and likely.
White lithium grease, againalex the engineer
Aug 29, 2001 12:12 PM
People seem to want to use this tuff for all kinds of circumstances which it is just not good for. The lithium "soap" which is a major component of this grease will HOLD water! This is just about the worst thing you can do for a BB bearing! Unless you can ensure that the bearings will always stay absolutely dry, don't use lithium grease! A waterproof grease (such as Phil) will hold up under wet conditions MUCH better.
Makes Sense to Megrz mnky
Aug 30, 2001 8:38 AM
That would explain why I've had such horrible results with the stuff in a marine environment.

Using Phil grease is such a no-brainer.