Final Drive Issues- Chapter 2

Are ya having a problem with your rig? We'll try to help. Share your tech tips and experiences here. Dr. Billy Glaser, author of the "Unofficial 750 Ural Service Manual" site myural.com, is moderating this section.
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gobium
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Re: Final Drive Issues- Chapter 2

Postby gobium » Mon Mar 14, 2016 9:17 am

New FDs don't come with bent over taps.
Taps are NO longer available .
Lock taps are one time use, not wise to re use them

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Msblu79
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Re: Final Drive Issues- Chapter 2

Postby Msblu79 » Mon Mar 14, 2016 9:40 am

From what I have seen and experienced the usual failure mode in the FD is the bolt heads shearing off and leaving the threaded stud loctited in the ring gear. Torquing the 10.9 bolts to 24 lb./ft. will stretch and preload the shank and prevent it from moving and developing a fracture under the bolt head.
2010 Black Patrol

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propwash
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Re: Final Drive Issues- Chapter 2

Postby propwash » Mon Mar 14, 2016 10:15 am

VWK75S wrote:From experience?
John

Yes, from experience. I would not make a statement like that without direct experience. I have seen this on 2 other bikes as well.
Bolts stretch and loosen.
On 1WD models, (if you check the fluid level often) you will notice the fluid has become silvery. If you attend to the issue at that moment, you will find the fold-over tabs have failed and the bolt heads are rubbing against the outer case. The aluminum particles make the final drive fluid silvery.
Attending to this early, avoids catastrophe.
BTW - these tabs are still available from overseas suppliers.
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Re: Final Drive Issues- Chapter 2

Postby gobium » Mon Mar 14, 2016 10:28 am

Msblu79 wrote:From what I have seen and experienced the usual failure mode in the FD is the bolt heads shearing off and leaving the threaded stud loctited in the ring gear. Torquing the 10.9 bolts to 24 lb./ft. will stretch and preload the shank and prevent it from moving and developing a fracture under the bolt head.

+1.
Never saw bolts back out, only heads shear off

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VWK75S
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Re: Final Drive Issues- Chapter 2

Postby VWK75S » Tue Mar 15, 2016 4:44 am

propwash wrote:Yes, from experience. I would not make a statement like that without direct experience.

Good to know that makes the advice more valuable.
Thanks, John
The Ural's made Maine a much bigger state.

2009 GearUp 125,000kms
2007 Retro 20,000kms
1991 VWK75S


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