rear hub / axle questions - MVAgusta.net
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post #1 of 20 (permalink) Old 11-27-2013, 07:49 PM Thread Starter
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rear hub / axle questions

In the book titled "I've Never Had a Motorcycle This Far Apart Before", this is Chapter Three, "Rear Hub Failure".

As I exited the freeway on my way to work this morning, I thought that I heard an odd 'creak' coming from somewhere. Three more block to work. Park bike. Go to work.
When I came out I thought it *might* be a good idea to figure out what that noise was before I headed home. Rolled the bike back and forth, listening and homing in on the rear wheel, and our rolls a ball bearing.

As it turns out, those new Ford flatbed tow trucks ride quite nicely.





So what I'm wondering at this point is how bad is this? Do I need a new hub, or can the remnants of the bearings be removed and new ones fitted?
The 'sleeve', nearest the 'top' of the axle (bottom photo) ought to come off, yes? It's pretty firmly fixed in place at this point.
The 'bottom', lighter-colored, sleeve moves freely and I imagine that both need to come off to remove the parts of the bearing that are still on the very bottom of the axle, nearest the rotor.

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post #2 of 20 (permalink) Old 11-27-2013, 07:57 PM
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The picture you show is of the roller bearing side of the hub. Those rarely fail. It's the other side that is shot. Pull the two sleeves off the axle. If the bearing is frozen to the axle, you'll have to cut it off. A cut off wheel should do the trick.

You are correct; that upper sleeve should slide right off. You may not need a new hub, you'll certainly need new bearings. I think Noel has them.
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post #3 of 20 (permalink) Old 11-27-2013, 07:58 PM
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Noel can help you out here. I think you can probably replace all the bearings with better units as recommended elsewhere...again, Noel has the info. If you want another hub, you can't go wrong with a Mitchy Unit...or, I have a nicely kept hub from my 312R sitting here if you get in a bind...no pun intended.
Glad you are alright.

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post #4 of 20 (permalink) Old 11-27-2013, 08:08 PM Thread Starter
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Thanks Carl. I'll break out the Dremel tool.

Here is the other side:


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post #5 of 20 (permalink) Old 11-27-2013, 08:18 PM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
Noel can help you out here. I think you can probably replace all the bearings with better units as recommended elsewhere...again, Noel has the info. If you want another hub, you can't go wrong with a Mitchy Unit...or, I have a nicely kept hub from my 312R sitting here if you get in a bind...no pun intended.
Glad you are alright.
Thanks Chuck. Noel was the first thing I did (pm). :-)

As nice as a new Mitchy hub would be, if I can get away with just 'replacing the bearings' (upgraded), I'd probably prefer that. Thanks for the offer. I will certainly keep it in mind.

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post #6 of 20 (permalink) Old 11-27-2013, 08:24 PM Thread Starter
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Quote:
Originally Posted by CAG View Post
The picture you show is of the roller bearing side of the hub. Those rarely fail. It's the other side that is shot. Pull the two sleeves off the axle. If the bearing is frozen to the axle, you'll have to cut it off. A cut off wheel should do the trick.

You are correct; that upper sleeve should slide right off. You may not need a new hub, you'll certainly need new bearings. I think Noel has them.
Regarding that upper sleeve, am I correct that it is not part of the needle bearing and that it is something that I will need to get in addition to the 'new bearings'?

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post #7 of 20 (permalink) Old 11-27-2013, 08:28 PM
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post #8 of 20 (permalink) Old 11-27-2013, 11:22 PM
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Wink

just spoke with Chris.....

the inner race of the needle bearing shows no wear.....its good to go
and its already moved ~8mm usually there is some stuff in the spline area that hangs the inner race up a bit......out comes the Snap On bearing separator.....the inner race of the ball bearing gets heated with the TIG machine, then it just falls off



I'm just glad he stopped

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post #9 of 20 (permalink) Old 11-28-2013, 03:19 AM
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Bearing separator is the safest way to go,you don't want to slip and cut into the axleA machine shop won't charge you much to pull the cage.I noticed there is not much grease in that hub,lack of service is evident.


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post #10 of 20 (permalink) Old 11-28-2013, 03:43 AM
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Quote:
Originally Posted by mitchy View Post
Bearing separator is the safest way to go,you don't want to slip and cut into the axleA machine shop won't charge you much to pull the cage.I noticed there is not much grease in that hub,lack of service is evident.

+ 10..I read on other bike forums about guys waving around Dremels and even angle grinders to get inner races off..

No way..Tig it like Noel said or use the tool like Mitchy said..but keep the Dremel in it's box.

A side point with Dremels..Be careful with htem they can inflict some nasty injuries and look like harmless little gadgets. I once had a cutting wheel fly off one and zip past my eye..How close ? very close. I have a friend whose thumb doesn't work right as he sliced into the nerve with a Dremel.

I had thousands of hours in the past working with three phase woodworking machinery...The blades were biggish ..Injuries..Nil..but then they look dangerous and Dremels don't...get the point ?
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