Rear Hub Sprocket Disassembly

rockitdoc · Feb 21, 2016

So, the shop manual didn't help much here. How does one get the rear sprocket/brake drum separated from the backing plate assembly?

kerinorton · Feb 21, 2016

It should just fall apart, unless the shoes have rusted to the drum. From the looks of it, you may find the brake lever can be moved easily back and forward a bit. It should spring backwards if all is ok. If not the shoes have seized to the drum and you are going to have to prize it apart. Some heat may help, or maybe squirting diesel fuel into where the shoes are. If the bearings are shot then soak it in diesel. If you have access to an acetylene torch, then heat it up evenly and it should let go.
Dereck

pete.v · Feb 21, 2016

Yes,remove the nut, washer, spacer from the stub axle it should just come/fall apart.

rockitdoc · Feb 21, 2016

It turns easily like bearing is good. But it ain't falling apart.

pete.v · Feb 21, 2016

rockitdoc said:
It turns easily like bearing is good. But it ain't falling apart.

Put the nut on until flush, put a block of wood against it and give it a bit of a pop with a mallet. Nothing too crazy.
Is the spacer off? It may be rusted or stuck on the stub axel. Just checkin.

kerinorton · Feb 21, 2016

Try dropping it with the nut screwed on at least 8 turns, and the nut facing down [ rotate it clockwise 90 degrees according to your picture ]. Helps if its dropped onto something really solid. Keep dropping till it comes off.
Dereck

rockitdoc · Feb 21, 2016

Is this the idea?

I tried a couple of good wacks but it sounds really solid, like I haven't removed a retaining ring or something. :?:

pete.v · Feb 21, 2016

That 1/2" spacer(Part number 14 http://www.oldbritts.com/1972_g17.html ) is frozen on the stub axle. Heat it up and try it again. And put a piece of hard wood in between the nut and that hammer.
Don't hit it the way you have it sittng like that. You're just driving the stub axle into the snap ring on the hub. Set it on its side like in your first photo or hold it up by the brake lever or the like. The stub axle is part of the hub, not the brake plate #13.

kerinorton · Feb 22, 2016

that's definitely a NO NO. you will end up deforming the nut to an unusable state. Better to do as I suggested.

Hint. use a small hammer to rivet things over. use a big hammer to move things.

In your case, the brake back plate and shoes are effectively the hammer if you do as I suggested.

If it's that tight, then you will run the risk of damaging the bearings whatever you do. That's life though.

Dereck

Rear Hub Sprocket Disassembly

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