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final drive wedge bolt falling out


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#1 nicktulloh

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Posted 01 January 2015 - 11:49 AM

2011 GearUp with 3,000 miles.

I don't get how this can happen if it was correctly indexed and shimmed at the factory. However it happened, I need to fix it but I'm having a hard time figuring out where the shims are and I can't find a parts listing for them.

Any help?

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#2 sallen

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Posted 01 January 2015 - 08:16 PM

New to the Ural bikes, but on my Dnepr I replace all the wedge bolts with grade 8 bolts filed to fit

#3 Vance Blosser

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Posted 01 January 2015 - 08:40 PM

I believe Terry Crawford has them, and can probably tell you why it came out. My '94 did this about 16 years ago but I can't remember the cause.

#4 nicktulloh

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Posted 01 January 2015 - 11:44 PM

View PostVance Blosser, on 01 January 2015 - 08:40 PM, said:

I believe Terry Crawford has them, and can probably tell you why it came out. My '94 did this about 16 years ago but I can't remember the cause.

Thanks, I'll try him. Any idea why it's a wedge bolt and not a regular bolt?

#5 Russ Noe

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Posted 02 January 2015 - 04:44 PM

View Postnicktulloh, on 01 January 2015 - 11:44 PM, said:

View PostVance Blosser, on 01 January 2015 - 08:40 PM, said:

I believe Terry Crawford has them, and can probably tell you why it came out. My '94 did this about 16 years ago but I can't remember the cause.

Thanks, I'll try him. Any idea why it's a wedge bolt and not a regular bolt?
A regular bolt will always have some slop between it and the hole it occupies.  This leads to increasing slop and eventually failure.
A Wedge bolt binds into the hole, and prevents any motion/slop built-up....unless it comes loose as has the one on your bike.  This is a vary rare event.  Like Vance, I've only seen this happen twice in 15 years of Uraling.  And the failure Vance noted was one of those!
~RN

#6 BigJames

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Posted 03 January 2015 - 08:02 AM

Why do I have this sinking feeling that Nick is about to find there is something a miss in his FD or just might get lucky and normal wear in makes it need just one more shim?
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#7 nicktulloh

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Posted 03 January 2015 - 10:51 PM

View PostRuss Noe, on 02 January 2015 - 04:44 PM, said:

View Postnicktulloh, on 01 January 2015 - 11:44 PM, said:

View PostVance Blosser, on 01 January 2015 - 08:40 PM, said:

I believe Terry Crawford has them, and can probably tell you why it came out. My '94 did this about 16 years ago but I can't remember the cause.

Thanks, I'll try him. Any idea why it's a wedge bolt and not a regular bolt?
A regular bolt will always have some slop between it and the hole it occupies.  This leads to increasing slop and eventually failure.
A Wedge bolt binds into the hole, and prevents any motion/slop built-up....unless it comes loose as has the one on your bike.  This is a vary rare event.  Like Vance, I've only seen this happen twice in 15 years of Uraling.  And the failure Vance noted was one of those!
~RN

Do you recall the cause then? I can't find anything indicating how to set the shims, any hints?

#8 Vance Blosser

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Posted 05 January 2015 - 07:28 PM

No, but Terry will know.

#9 lobofuego

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Posted 06 May 2015 - 12:39 PM

Well , the wedge bolt as standard functions as a device to set preload on the pinion...you will note it has three...sides...and that it is also directional that is fitted to a specific side...this is so that with the application of a specific shim and the fitment of the bolt  a set preload is established....this is clever !!....the bolt escaping would indicate, a new shim  is needed, otherwise, pinion  could be damaged.....

#10 Norm O

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Posted 06 May 2015 - 07:32 PM

Have a look at this thread on SS. It clearly explains what you need to know:

t:

http://www.sovietste...php?f=5&t=24720

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