Replacing the clutch hub

SteveBorland · Jul 9, 2014

Going through my 850, I noticed that the clutch hub was a bit notched, so I bought a new from Andover Norton (I was pleasantly surprised at how competitive their price for a box of bits was relative to other Norton pushers such as RGM by the way).

Question is, how to remove the hub ? I've removed the 2 cir clips locating the bearing, but I don't really want to start walloping the inner race of the bearing if it can be avoided.I do have a replacement bearing if necessary, but surely there is a recommended way of removing the inner hub without destroying the bearing?

Thanks,
Steve in Denmark

L.A.B. · Jul 9, 2014

SteveBorland said:
Question is, how to remove the hub ? I've removed the 2 cir clips locating the bearing, but I don't really want to start walloping the inner race of the bearing if it can be avoided.

If I remember correctly, when I did that, it wasn't a particularly tight fit.

auldblue · Jul 9, 2014

Hi

Sit it on the vice and tap it out firmly with an ally drift , takes 2 ticks.

Here's one I did earlier.

SteveBorland · Jul 10, 2014

Hmm, this is not working for me. Even after giving it some serious thumps with a hammer & drift, the little bugger is not budging. Time to find a press I think.

ML · Jul 10, 2014

When you finally get to re-fit the new centre, push it in as far as it can go and then hold the clutch chain wheel in one hand and press and rotate the new centre. If there is any grinding or contact, the clutch will drag badly when hot. This has happened to me with a new centre on a chain wheel and also on a belt wheel. The solution is to remove the centre and either lathe off minimum 0.5mm or grind off around the inner flange of the centre.

auldblue · Jul 10, 2014

Steve

Have you tried some lubricant or penetrating oil , and even leave it steeping overnight.

You don't need a press use ur vice and a few bits of wood , after all that is what they used in the factory building them!

kerinorton · Jul 10, 2014

Am I missing something here. Even on my very low mileage 750, that hub all but falls of the spline. If its tight, there are 2 threads in it where bolts can be screwed in to enable pulling it of the shaft [ after releasing the clutch cable to let the pushrod go right into the g/box. ]

pete.v · Jul 10, 2014

kerinorton said:
Am I missing something here. Even on my very low mileage 750, that hub all but falls of the spline. If its tight, there are 2 threads in it where bolts can be screwed in to enable pulling it of the shaft [ after releasing the clutch cable to let the pushrod go right into the g/box. ]

The clutch center is somewhat of an interference fit in the bearing. You should be able to drive it out with a wood dowel from the back side.

L.A.B. · Jul 10, 2014

kerinorton said:
Am I missing something here. Even on my very low mileage 750, that hub all but falls of the spline. If its tight, there are 2 threads in it where bolts can be screwed in to enable pulling it of the shaft [ after releasing the clutch cable to let the pushrod go right into the g/box. ]

I think perhaps you are, as this thread is about separating the hub (centre) from the clutch basket, not about removing the clutch assembly from the mainshaft.

auldblue · Jul 10, 2014

My back wheel 69 bolt job comes off easy peasy, but the first time I tried I couldn't get it to budge I looked everyplace to see if there was something holding it, nothin. Ended up with wooden wedges and a lump hammer and belted seven shades out it but it came off with no damage. No damage to the bike anyway ,

J

Torontonian · Jul 10, 2014

Hardened center. Wood knocks yes .

SteveBorland · Jul 11, 2014

Thanks for the replies. I did try using a vice , but my vice is not deep enough to get a centered push on the hub. Going off to the summerhouse tomorrow for 2 weeks, so when I get back, I shall visit a press-owning friend. Less likely to damage the bearing and bits that way rather than thumping away with a hammer.

olChris · Jul 11, 2014

kerinorton said:
Am I missing something here. Even on my very low mileage 750, that hub all but falls of the spline. If its tight, there are 2 threads in it where bolts can be screwed in to enable pulling it of the shaft [ after releasing the clutch cable to let the pushrod go right into the g/box. ]

Im with you.. Think we are talking apples and pears here. Im confused as to what is to be removed.. eg the clutch drum or the clutch centre as per olblue's pic.. A few pic would be nice......... "The summer house" :lol: :lol: :lol:

pete.v · Jul 11, 2014

olChris said:
kerinorton said:

Am I missing something here. Even on my very low mileage 750, that hub all but falls of the spline. If its tight, there are 2 threads in it where bolts can be screwed in to enable pulling it of the shaft [ after releasing the clutch cable to let the pushrod go right into the g/box. ]

Click to expand...

Im with you.. Think we are talking apples and pears here. Im confused as to what is to be removed.. eg the clutch drum or the clutch centre as per olblue's pic.. A few pic would be nice......... "The summer house" :lol: :lol: :lol:

Both.

The clutch hub must be removed to remove the clutch retaining clip from the backside, and then drive the center out. Perhaps while your are there, the bearing outer clip and the bearing can be replaces.

auldblue · Jul 11, 2014

Hi steve

It takes 10mins and 5 of that is looking for the circlip pliers and another 3 to stage the photo my pizza takes 19 -21. A know this is a stupid thing to say but are you going the correct way when tapping the bearing out , steve you can do it .

Pizzas ready bye

Copper rawhide mallet and drift
Is it just me or is somebody talking the Michael .

The postie just arrived as I was finishing my tex mex.

New clutch hub in the belt drive.

SteveBorland · Jul 11, 2014

I certainly hope so ;-). I'm trying to drive the hub through the inner bearing race, i.e. towards the gearbox side.

/Steve.

pete.v · Jul 11, 2014

SteveBorland said:
I certainly hope so ;-). I'm trying to drive the hub through the inner bearing race, i.e. towards the gearbox side.

/Steve.

WRONG!
Wait a minute. Is the clutch hub off the bike with the center in place? The clutch hub, with the center, should just slip off the main shaft, unless you have jump a sheared clutch locating clip.

SteveBorland · Jul 12, 2014

Hmm. I think you have misread the whole thread

Let me repeat - this is _not_ about removing the clutch and clutch basket (as one unit) from the gearbox shaft. Please try sitting with the basket & hub in you hand, then remove the hub from the bearing in the basket.
Not quite the same thing.

Chris · Jul 12, 2014

Hi

I had a similar problem a few years ago with a rebuild & found a bearing locktight had been used. Presumaby the previous owner thought the fit was too loose

Chris

auldblue · Jul 12, 2014

Steve

Speak to time warp !!

Replacing the clutch hub

SteveBorland

L.A.B.

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