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Old 07-27-2006, 10:12 AM   #1
Hoff OP
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Rear Axle Nut

As I was Installing the rear wheel on my 950 Adv last weekend and tightening the axle nut to the 110 Nm specified in the owners manual, I heard an ominous crunching sound as the nut was getting tight. Turns out the end of the nut fractured and the axle was poking through. I've had the wheel on and off several times repatching a punctured tube while waiting for a new one. I'm curious to know if anyone else has experienced this problem. I'm also wondering whether the 110 Nm of torque is intended to measure how tightly the axle tightens against the inside of the axle nut (meaning that the nut has to be replaced), or is it a measure of how much clamping force the axle/nut applies to the swingarm (in which case I could still use the fractured nut). Any insights would be appreciated. Thanks...
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Old 07-27-2006, 10:45 AM   #2
cpmodem
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Quote:
Originally Posted by Hoff
As I was Installing the rear wheel on my 950 Adv last weekend and tightening the axle nut to the 110 Nm specified in the owners manual, I heard an ominous crunching sound as the nut was getting tight. Turns out the end of the nut fractured and the axle was poking through. I've had the wheel on and off several times repatching a punctured tube while waiting for a new one. I'm curious to know if anyone else has experienced this problem. I'm also wondering whether the 110 Nm of torque is intended to measure how tightly the axle tightens against the inside of the axle nut (meaning that the nut has to be replaced), or is it a measure of how much clamping force the axle/nut applies to the swingarm (in which case I could still use the fractured nut). Any insights would be appreciated. Thanks...
First I've heard of that problem. Sure you had all of the spacers installed?
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Old 07-27-2006, 11:16 AM   #3
gefr
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Why did it bottom??

The broken nut bottom is of no great concern as is the reason it happened!! What he said: All spacers were in place?? In case of reusing the same nut, it could give you peace of mind to loctite one or two threads!! My 0,02$ Good luck with the findings!!
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Old 07-27-2006, 11:39 AM   #4
Hoff OP
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CP - As far as I can tell, the only spacer for that side is the chain tensioner with the recess for the collar nut facing out.

I suspect that the axle tightens against the bottom of the axle nut as a means of keeping the nut from vibrating loose.

Hoff screwed with this post 07-27-2006 at 11:49 AM
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Old 07-27-2006, 12:11 PM   #5
erider
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Axle Nut Failures

High Cycle Fatigue - taking the aluminum nuts on/off several times - will utlitmatley result in failure. The aluminum thread crests will 'stretch' (deform) when being repeatedly torqued on a steel axle. Sooner or later the nut becomes loose, and then possibly cracks. That's why we make stainless axle nuts for the off-road bikes.

www.erider.ws

Question to the group at large: Should we tool up and start making them for the 950/990 bikes ?
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Old 07-27-2006, 12:16 PM   #6
gefr
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There are several spacers inside the swingarm!!!

Are they all in the right place!! I believe and forgive me insisting, the blind nuts usually are made this way for aesthetic reasons and not to take loads!! The forces are taken by their threads!! If it was ment to be this way, it would be broken from the begining, or KTM wouldn't have put a blind nut there in the first place!! I believe someone is missing the party!!

http://216.165.194.66/munnracing/cat...%20WHEEL%20LC8

I would suggest have a look here!!! Good luck!!!
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Old 07-27-2006, 01:31 PM   #7
cpmodem
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Quote:
Originally Posted by Hoff
CP - As far as I can tell, the only spacer for that side is the chain tensioner with the recess for the collar nut facing out.

I suspect that the axle tightens against the bottom of the axle nut as a means of keeping the nut from vibrating loose.
There are 2 spacers (actually 3 if you count the one in the hub) on the rear axle. I just checked my axle and nut, and there is 5 mm of clearance between the end of the axle and the bottom (inside) of the collar nut threads when torqued to spec. Maybe you should pull the axle out and check to make sure everything is there as per gefr's link. Good news is it looks like the nut is inexpensive
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Old 07-27-2006, 01:50 PM   #8
rider914
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Maybe take a close look at the sprocket carrier / cush-drive assy?

Any chance the axle could get pulled thru the left-side block?

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Old 07-27-2006, 01:53 PM   #9
Hoff OP
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I hadn't intentionally removed any of the spacer bushings from the sprocket support or brake side of the wheel. But, I had the wheel off to take it to the dealer to get it balanced, so it's possible one might have fallen out at the shop or somewhere along the way. The wheel usually just fits between the swingarms when I install it, and I didn't notice any extra room this time, but I'll have to double check. Thanks for the suggestions.
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Old 07-27-2006, 02:48 PM   #10
dirtyboy
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Hopefully you haven't bent the swingarm!

FWIW...I have slammed the axle nut on my 520EXC hard enough to tear open the end. But it still works fine since the threads take the load. The axle should NOT bottom out on the nut. I ended up replacing the nut only for aesthetics.

As a rule, I tighten my axle nuts with the same length wrench/bar as what I would use to remove them out on the trail. 110nm sounds awfully tight to me even if that's what the manual calls for. I don't know about you, but I don't carry an 18" breaker bar in my pack...
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Old 07-28-2006, 09:11 AM   #11
gefr
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New info!!

My mechanic told me the spacer that stays with the axle is actually screwed on it so it could have moved(unscrewed some rounds) leaving the axle long enough to destroy the nut bottom!!! Good luck!!!
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Old 07-28-2006, 09:24 AM   #12
2jet
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110 NM's ?????

that sounds really tight. Just checked my book (05.5) and it says 90NM for the axel nut.
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Old 07-28-2006, 02:07 PM   #13
Hoff OP
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I checked the wheel when I got home last night and the right side spacer bushing was in fact missing. I just got off the phone with the dealer, they had found it next to the wheel balance machine but didn't know who it belonged to. I'll definitely have to be more careful about checking these things in the future.

So in regards to my original question, I think it's safe to say that the axle is not supposed to bottom out in the axle nut, and a cracked nut is a sure sign something is wrong or missing. Thanks again to everyone who encouraged me to look at the obvious, I would have never thought of it.
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Old 07-28-2006, 02:15 PM   #14
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Quote:
Originally Posted by gefr
My mechanic told me the spacer that stays with the axle is actually screwed on it so it could have moved(unscrewed some rounds) leaving the axle long enough to destroy the nut bottom!!! Good luck!!!
You need to find a new mechanic
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Old 07-28-2006, 04:09 PM   #15
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Thanks for the suggestion!!!

Quote:
Originally Posted by Ant Ware
You need to find a new mechanic
It is easy to say but difficult to find!! I try to work it out with what I've got!! Too busy usually to improvise or even to check out some things!! Not a perfect world, I've compromised!!
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