Design Corse rear hub failure - MVAgusta.net
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post #1 of 9 (permalink) Old 06-16-2018, 05:28 PM Thread Starter
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Design Corse rear hub failure

Anyone had one fail? Axle moved to the right and the sprocket carrier rubbed the face of the hub. Also ruined the "hat shaped" spacer that's right after the sprocket carrier. Failure was because of the central spacer between the bearings. It's aluminum.. why? It's shorter than it used to be. One face is mushroomed and grooves are cut or imprinted into both faces where the bearing races used to contact it. I can't tell if it's because the bearings spun against it or if it's just crushed. Maybe it became crushed first, allowing the stack of bearings and spacers to become so loose that it allowed the bearings to spin against it. All 3 bearings still look good. So, it looks like the spacer was the culprit. I've torqued the nut 3 times in the last, each time to the prescribed 200-220Nm. The only way I see this happening is if I over-torqued or if this spacer is a piece of crap because it's made of aluminum. Has anyone else had this aluminum spacer problem?

...I thought posted this already, but I guess I didn't. Sorry of this is a duplicate.
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post #2 of 9 (permalink) Old 06-16-2018, 06:34 PM
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moocowman;
All 1st Gen MVs have an aluminum center spacer, without issues
I only know of 1 needle bearing failure....the inner seal was cut and all the grease went into the center
of the hub

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post #3 of 9 (permalink) Old 06-16-2018, 10:47 PM
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I shouldn't say anything but here we go.
My hubs use a aluminium spacer.
Just sold number 202.
How many failures 0.
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post #4 of 9 (permalink) Old 06-16-2018, 11:19 PM
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My confidence in my Mitch Hubs?
Presently approaching 32,000mi on #6 and haven't looked at it yet.....#2 isn't on the road yet (~1,000 test miles)

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post #5 of 9 (permalink) Old 06-16-2018, 11:25 PM
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Wow,big mileage Noel.


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post #6 of 9 (permalink) Old 06-16-2018, 11:26 PM
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moocowman;
I'm in Redondo Beach, I have everything to get you back on the road tomorrow by noon, text me!
Everything is installed on a 2nd Gen axle mounted in my vise for you to see
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Last edited by theknurl; 06-16-2018 at 11:28 PM.
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post #7 of 9 (permalink) Old 06-16-2018, 11:33 PM
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Quote:
Originally Posted by moocowman View Post
Anyone had one fail? Axle moved to the right and the sprocket carrier rubbed the face of the hub. Also ruined the "hat shaped" spacer that's right after the sprocket carrier. Failure was because of the central spacer between the bearings. It's aluminum.. why? It's shorter than it used to be. One face is mushroomed and grooves are cut or imprinted into both faces where the bearing races used to contact it. I can't tell if it's because the bearings spun against it or if it's just crushed. Maybe it became crushed first, allowing the stack of bearings and spacers to become so loose that it allowed the bearings to spin against it. All 3 bearings still look good. So, it looks like the spacer was the culprit. I've torqued the nut 3 times in the last, each time to the prescribed 200-220Nm. The only way I see this happening is if I over-torqued or if this spacer is a piece of crap because it's made of aluminum. Has anyone else had this aluminum spacer problem?

...I thought posted this already, but I guess I didn't. Sorry of this is a duplicate.
Sorry to hear about your failure,but it seems like the sprocket nut has been under tensioned to start with and that is when the damage has occurred,then you have re-tensioned the nut and caused the spacer to collapse further.If the stack is tensioned correctly the aluminium spacer will do its job just fine.It all rotates as one piece.
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post #8 of 9 (permalink) Old 06-17-2018, 12:41 AM Thread Starter
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I should have taken the hub apart earlier to service it. I might have noticed the damaged spacers. The times I've had it apart, I've only rolled the bearings to make sure they're not binding or making noise. Noel, thanks for the offer. I had my machinist turn some new steel spacers for me. I suppose it doesn't matter what material it is. If it spins, any type of material will get damaged. I try to analyze what caused it, but i guess that doesn't matter neither. Important lesson I've learned. Watch the gap behind the sprocket carrier and inspect the hub every time I have the wheel off.
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post #9 of 9 (permalink) Old 06-17-2018, 12:46 AM Thread Starter
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Funny, we were supposed to go to the Redondo Pier for seafood today, but too many people flaked.
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