Have I Destroyed My Rear Hub - MVAgusta.net
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post #1 of 161 (permalink) Old 05-31-2017, 02:21 PM Thread Starter
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Have I Destroyed My Rear Hub

Good Evening.

So this afternoon while riding the bike home from work I thought that something wasn't quite right, as every time I backed off the throttle to slow down for a bend it felt like rear wheel was skipping, almost like in gravel or something. Anyway, when I got home I wasn't happy with the way it felt so I stuck it up in the abba stand to get the rear off the ground so I could give it a good wobble to make sure all was well. Unfortunately there was a lot of play in the wheel but even worse I could see that the back side of the break disc had been rubbing against the calliper hanger. Upon closer inspection and to my total horror I discovered that the wheel nut on the sprocket side was really loose, I mean it only took about 4-5turns and it was off!!!!! It looks like the locating pin was not correctly seated and that is how it has worked loose.

Now, as for as I am aware the only person to have been anywhere near the rear end of my bike since I bought it was the asshat, so called, mechanic that changed my tyres for me prior to my trip to the Isle of Man Classic TT. I know he was messing about because of all the hassle I had trying to get him to accept that it was a 55mm socket he needed. So I am wondering if he made a utter arse of it and it has gradually worked loose. I am hoping to take apart the whole rear axle over the next few days to inspect the damage, I will follow up with pics of what I find.

What I am wondering is what are the chances the the rear hub is goosed, or could it just be the loose nut that has allowed some play in the axle resulting in the the rotor rubbing in the inside.??? Also I wonder how much come back I have on the mechanic that potentially caused this as it has taken so long to manifest.??

More importantly I could have bloody died!!
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post #2 of 161 (permalink) Old 05-31-2017, 02:24 PM
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I am left wondering why a Mechanic would touch the Sprocket Side nut during a tire change.

There have been cases of that side nut backing off and loosening as things where in the hub assembly.

Torque the nut to spec and check your play in the hub.

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post #3 of 161 (permalink) Old 05-31-2017, 02:30 PM Thread Starter
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I also wondered why he wold be messing about at that side, but he also couldn't work out the size of socket he needed, even after he was told by myself and another garage that it was 55mm. Trust me when I say he will never see my custom again!! He is just a little local mechanic I was pointed to my a friend that uses him for his bike. never again!

I did tighten up the nut and the play certainly got less, but I have lost my adapter to make the 55mm socket fit my socket set so can't set the correct torque. Have one ordered so hopefully tomorrow.
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post #4 of 161 (permalink) Old 05-31-2017, 03:54 PM
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My advice is remove the hub,check for damage.
Service the hub if there is no damage and replace the disc caliper bracket.
Buy yourself the correct wheel nut tool.
A standard socket is not correct because the nuts are tapered.


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Last edited by mitchy; 05-31-2017 at 03:57 PM.
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post #5 of 161 (permalink) Old 05-31-2017, 03:58 PM Thread Starter
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Thats was my thinking also, I am looking to replace the chain and sprockets anyway. so may as well get them done at the same time while everything is apart.
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post #6 of 161 (permalink) Old 05-31-2017, 04:03 PM Thread Starter
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would I be right in thinking that this is the right kind of grease for the hub.

https://www.amazon.co.uk/Mobil-Mobil...um+soap+grease
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post #7 of 161 (permalink) Old 05-31-2017, 04:43 PM
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Yes,that looks OK.


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post #8 of 161 (permalink) Old 05-31-2017, 04:45 PM Thread Starter
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thanks, i tried to find as close a match to the specs in the manual as I could, but often not all the information is presented.
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post #9 of 161 (permalink) Old 06-01-2017, 06:01 PM
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Thumbs up ?

My vote......
the 3810-2RS died, allowing the axle to go left into the caliper mount and making the sprocket nut seem loose

If the sprocket nut was loose, and the bearing good the axle/wheel assembly will go right away from the caliper mount

A complete disassembly and inspection will tell you what's wrong
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post #10 of 161 (permalink) Old 06-02-2017, 01:58 AM Thread Starter
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Would I be right in thinking that 3810-2RS refers to the bearing inside the hub unit? I am not familiar with that part number. I had wondered if the spacer and gone allowing the wheel move. But as you say a complete deconstruction will hopefully yield the answer. I hope to get started this evening if the rain holds off.

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