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17 Jan 2002
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Contributing Member
Veteran HUBBer
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Join Date: Jan 2001
Location: Gerrards Cross, Bucks, UK
Posts: 150
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Bevel Drive Pivot Bearing Failure
Whilst servicing my 1989 R100GS two days ago I discovered some free play in the back wheel. Upon closer inspection I found that the tapered roller bearing on the bevel drive pivot stub (left hand) had failed and was about to disintegrate.
Does anybody have any idea what may have caused this other than component failure (the bike's only done 35000 miles)?
I'd like to avoid a repeat of this as finding BMW parts in Southern India is proving somewhat tricky and I hate to think what might have happened if it had failed whilst fully loaded trundling along a Goan road...
Harvey
www.chasingthesun.org
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17 Jan 2002
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Registered Users
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Join Date: Aug 2001
Location: Sicamous,Canada
Posts: 133
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hi harvey
those bearing can go as early as 35,000miles keep a close eye on the front uj on the shaft as they are can go as well nobby
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17 Jan 2002
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Registered Users
HUBB regular
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Join Date: Nov 2000
Location: Hampshire
Posts: 23
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Having spent three memorable hours back in the UK trying to help Harvey refit the bevel housing back onto the drive shaft - and looking forward to the repeat experience when we finally manage to get hold of the bearings - I was wondering how you can check up on things like that without removing the bevel housing each time (a complete pain in the preverbial)? It was the outer casing of the bearing that failed which you cannot see without taking it all apart. Also any tips on keeping an eye on the front universal joint - is it as difficult to see into as the rear one?
Cheers
Lisa www.chasingthesun.org
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18 Jan 2002
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HU Founder
Veteran HUBBer
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Join Date: Dec 1997
Location: BC Canada
Posts: 7,323
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Checking the housing bearing isn't possible without taking it apart, other than checking for looseness in the wheel.
It's not a very common problem, but it does happen. On the non-paralever model it's extremely rare.
Checking the u-joint on the front is a hassle, not worth getting in there to do. Just spin the wheel slowly and listen/feel for roughness - in both directions. You can squeeze the rubber boot at the front and feel the shaft rotating. The rotating bumps are the u-joint. If it starts getting lumpy/rough there is a problem coming. Get a spare driveshaft and carry it from then on, or replace if you are heading off into the boonies. It can fail suddenly. Consider the paralever driveshaft a standard maintenance replacement item - 30-60,000 miles.
The non-paralever driveshaft will probably never fail.
------------------
Grant Johnson
Share the Dream!
at: www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.
------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
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