Rear hub issue - 550 k3

[hunterso]

Hi Gents

Have decided too pull the back wheel to replace the sprocket and have noticed a couple of issues.

There is quite a lot of movement on the sprocket hub/flange behind the bearing retainer ring.
So much so, that the sprocket side plate is wearing a groove in the collar that holds the oil seal.
Feels like the retainer ring needs to snug up a bit more but it seems tight





You can see the movement in the above 2 pics - look at he gap at the top part of the ring.
The gap opens if i push the top of the sprocket.
It would appear that when under load the sprocket would be pulled down, allowing the sprocket cover plate to contact the collar and wear a groove into it

Can anyone confirm that the correct retainer ring is installed as all the others i have seen have 4 holes - this has 2



Any tips for removing the ring (the tools i see being sold have 4 prongs) - and i take it this is a left hand thread - right = loosen

I need to get this off  to see if there is anything amiss inside

Anyone got a decent spare retainer ring hanging around?

Can anyone shed any light on what's going on - all help very much appreciated

thanks

[hairygit]

Could well be knackered cush drive rubbers, over the years they harden and shrink, which would allow the symptoms you are describing. The retainer ring doesn't look like a standard part, but it's purpose is to hold the wheel bearing in place

[hunterso]

That would make sense - need to get the retainer ring off to check it out.

Any tips for removal without a proper tool - don't just want to start hitting it with a drift.

[Trigger]

I just drift mine out. Took me a while to find out that it was a left hand tread and when you put it back in, if you do it too tight it stops the bearing from rotating  because the axle collar is pressing on the inside of the bearing. And the bearing retainer puts pressure on the outside if tight. 

[MikeM]

mine had 4 holes when I changed bearings in mine

used 2 studs welded to bit of rod ... bit of a home made tool but cant recall where I put it

was left hand thread

[MikeM]

could try 2 bolts through a bit of plate

bit like this

[LesterPiglet]

Don't forget to drill the stakes out before you try and remove it.

[LesterPiglet]

I certainly needed to take a drill to mine.

[matthewmosse]

On my bike I even tried welding a steel bar to the retainer and it wouldn't work - I ended up making a special jig to hold the hub in the lathe to re line the brake with the bearings in situ. I hope I never need to do the bearings, if I do I think I'll be practicing turning left hand threads on my lathe.

[hairygit]

Pattern ones are available, exact copies of the original (4 holes) from cmsl, but it' 57 euros (ouch!) Dave Silver may be worth a try for a pattern one

Sent from my GT-S5839i using Tapatalk 2

[hunterso]

Hmmmmm - bugger

Ok i have tried removing it with a drift - not budged it one bit 

I think i might take to a local motor engineers to see what he can do.
It cant be used without seeing what is going on behind the retainer - i'm in agreement with hairygit that the cush rubbers are knackered.

If i cant get the ring off, then worst case scenario - i have to source another hub and re-lace my rim.

So it looks the  hunt could be on for a spare hub/wheel that anyone may have lying around (preferably without the retainer ring in place!!)

Oddjob  - thanks for the offer of the retainer ring - i will come back to you

[matthewmosse]

Although it didn't work for me, try welding a bar to it and then use a bit of heat plus precussion and it should move- I wasn't that determined to move mine and weling a bar on is easily reversible, just grind the welds back and dress with a file. That way the retainer is re usable.

[hairygit]

Another way that has worked for me in the past is 2 bolts in a bench vice, then place the retainer on to the bolts and try turning the wheel. Make sure the vice is sturdily mounted, you'd be surprised how much force you can impart by turning the wheel, and most times it will work, good luck

[hunterso]

Just had a go at hairygits vice suggestion.

I need a bigger vice as the bolts are to close to the edges of the jaws for my liking.
Gave it a go and i swore i felt it move - nope just bent the bolts 
Had another go with the bolts much lower but the wheel started to get a bit too heavy to keep level and turn it at the same time.

Wife not much help either!

[hunterso]

Ok its off!!

Got a small bike shop in Leeds to have a look at it (carl ward motorcycles) - he said he hadn't done one for about 15 years and it was a real bugger to do.



This is the type of cush drive inside - need to find replacements i think



The one part that doesn't look good to me is the sprocket carrier
It looks like its been ground down on the top part - would explain the sideways movement i was getting.





Picture from inside



Does the height of the top part look right?
Can anyone confirm the height so i can check if its ok






Oddjob will pm you

Thanks