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Rear wheel stub axle

Submitted by peter_brown1 on Wed, 23/12/2020
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Nortons - General

I may have over elaborated on my featherbed Twins post on rear drum assembly. All I need to know is when tightening the LH wheel nut (the stub axle one) does it tighten onto the small shoulder on stub axle (where the flats terminate) and the inside of the swingarm fork end, the shoulder seems very small? On my bike this leaves the brakeplate and spacer very slightly loose. Or is the spacer and brakeplate supposed to be firmly trapped against the swing arm fork inner face. I see on some spares site there are various shims available to fit between the stub axle shoulder and inside face of the brake plate. Fitting a shim here would certainly trap the brakeplate and spacer when the nut is fully tightened. Wish I could find a sectioned view of a fully assembled hub!

Thanks

Submitted by john_holmes on Thu, 24/12/2020

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If the spacer is not trapped the bearing inners are free to spin on the axle, they wear the axle diameter smaller locally and the axle then becomes extremely hard to remove. So whatever the fix is the spacer must end up being locked.

Submitted by philip_hannam1 on Thu, 24/12/2020

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All of the locking forces should act on the large shoulder of the Stub Axle. Not the shoulder where the flats terminate.

Looking from the rear end left hand side.......there should should be in order left to right.

Axle Nut>>> Large Washer>>> Swinging Arm Slot>>>Large Round Spacer>>>Brake Plate>>> Stub Axle.

The base ring of the Stub Axle is pulled-up firmly against the twin ball bearing outer race by the right-side main axle.What some people get wrong is the order of parts in this area. Which should series as Stub Axle>>Shaped Bearing Cover>>Felt Washer>> Pen Steel washer>>Bearing

If the brake plate is flapping about when the Axle Nuts are tight then the most likely suspect for causing this is the large washer inside the swinging arm being too thin. It should sit on the Stub Axle and just reach to the start of the flats for the Swinging Arm Slot. The thickness of the Brake Plate when added to the Stub Axle should take this distance beyond the start of the flats by just enough to make everything lock between the nut and Stub Axle. If the Large Washer does look a bit thin then add a shim between it and the Brake Plate.

Submitted by peter_brown1 on Thu, 24/12/2020

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Hello Philip, thanks for info, thought pulling up on the small shoulder by the flats seemed wrong. I see now that RGM list a washer to go between inner face of brakeplate and stub axle shoulder, states its 0.025” thick which is bang on what it would need to trap the small spacer and brakeplate.

thank you for your help

Submitted by john_holmes on Thu, 24/12/2020

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Wrong spacer

Hello John H, not talking about the spacer between the bearings, thanks for taking time to comment

 

I am not talking that spacer either but there must be a axial force running from the nuts on either side going through the various spacers washers etc that locks the axle to the bearing inners, the spacer between the bearings is only one of these elements. On Triumphs its 2 thin nuts either side of the hub that stay with the wheel when its removed, on BSA's and Norton's it's the nuts either side of the swingarm. If the spacer spins it tells you the axial force is not present.

 



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