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#222871 - 11/10/08 3:20 pm T140 rear hub  
Joined: Nov 2008
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zhango Offline
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I've just bought a rear hub for disc brake off eBay and I want to remove the paint and polish before wheel build. It's in 2 halves although it is obviously made in 3 pieces. The parts book lists 2 halves but is it ok to separate the middle section and if so is that just a press fit on a spigot location?
Advice appreciated - thanks.

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#222877 - 11/10/08 4:54 pm Re: T140 rear hub [Re: zhango]  
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justrob Offline
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Milwaukee, WI USA
The rear hub I have on mine is actually 3 pieces. 2 sides that appear to be the same as the front hub and a middle spacer. The spare I have just pulled apart but it may have had some work done to it before I got it

#222878 - 11/10/08 4:58 pm Re: T140 rear hub [Re: justrob]  
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zhango Offline
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Thanks for reply Rob but are you saying you have separated the middle section? According to the Parts book the one half is supplied with the middle section attached so could be joined with high strength loctite for some reason?

#222883 - 11/10/08 5:31 pm Re: T140 rear hub [Re: zhango]  
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RF Whatley Offline
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I would highly advise some small punch marks or indelible marker spots before dis-assembly to help in re-aligning the pieces at assembly.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#222890 - 11/10/08 6:54 pm Re: T140 rear hub [Re: RF Whatley]  
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zhango Offline
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Thanks for advice RF but have you ever separated them?

#222912 - 11/10/08 7:10 pm Re: T140 rear hub [Re: zhango]  
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L.A.B. Online content
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All three pieces of the hub should pull apart (or fall apart?) fairly easily, once the axle/spindle and spokes are removed.


#222961 - 11/11/08 12:28 am Re: T140 rear hub [Re: L.A.B.]  
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Lorenzo Offline
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All the T140 parts books I could lay my hands on in a hurry list 3 separate pieces to the rear hub.
As far as part nos. go, there appear to be several variations depending on the year, and on later bikes whether the speedo. drive is on the left or right of the wheel.
Part nos. for front hub halves differ from rear hub halves; presumably these are actually different parts - anyone know for sure ?
A PO of my TR7 has butchered the left rear hub half; I have a spare front hub, but don't want to dismantle the whole wheel to find out that it won't fit.....

Further study of the parts book reveals that the lockring part nos. differ, so I think I may have answered my own question !

Last edited by Lorenzo; 11/11/08 12:51 am.

1978 T140E
1979 TR7V
1960 Royal Enfield Bullet 350
Waste not, want not.........Thrift is a virtue.
#222962 - 11/11/08 12:32 am Re: T140 rear hub [Re: L.A.B.]  
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zhango Offline
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Originally Posted By: L.A.B.
All three pieces of the hub should pull apart (or fall apart?) fairly easily, once the axle/spindle and spokes are removed.

That's what I expected but they don't, and the sprocket half is supplied as Part No 37-7001 which includes the centre part already attached; the disc half is Part No 37-7002. There is no part no for the centre bit so it looks like it was fitted at the factory as a press fit into the sprocket half. I was hoping to hear from someone who had separated the centre bit but perhaps nobody has? A bit of gentle heat may help.
Thanks for comments though.

#222963 - 11/11/08 1:38 am Re: T140 rear hub [Re: zhango]  
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Lorenzo Offline
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Lorenzo  Offline
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At least 2 of my parts books list 37-7010 for the centre section with left and right halves as listed, but Triumph parts books can be very misleading.....


1978 T140E
1979 TR7V
1960 Royal Enfield Bullet 350
Waste not, want not.........Thrift is a virtue.
#222965 - 11/11/08 12:47 am Re: T140 rear hub [Re: Lorenzo]  
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zhango Offline
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Originally Posted By: Lorenzo
A PO of my TR7 has butchered the left rear hub half; I have a spare front hub, but don't want to dismantle the whole wheel to find out that it won't fit.....

If someone had trouble parting them then perhaps it's best left alone? - so thanks for that and are you saying you have a part no for the centre bit?
My book also lists different part nos for front halves although I've just taken the rear disc half out to my bike and visually the front halves look the same as the rear.
I've just bought a front hub off eBay but not got it yet but when I do I'll take it apart and see what the differences are.

#222966 - 11/11/08 12:48 am Re: T140 rear hub [Re: zhango]  
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zhango Offline
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Ok thanks, you answered my question while I was posting.

#222976 - 11/11/08 3:13 am Re: T140 rear hub [Re: zhango]  
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Bret Edwards Offline
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Canby, Oregon
The painted hub is a front, unpainted is a rear.
The center section should come apart. This one needed a little help due to some oxidation on the machined mating steps. A couple love taps with a rubber malet did the trick.

The front and rear halves of the hubs with the threaded bearing retainer rings (#'s 2 and 4) appear to be identical to eachother. The other two front and rear halves (#'s 1 and 3) are quite different. In the next couple photos you can see the snout lengths and male and female machined mating steps are obviously different.







Cheers, Bret @ Glass from the Past
#223007 - 11/11/08 10:44 am Re: T140 rear hub [Re: Bret Edwards]  
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zhango Offline
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Bret, you're a top man! - excellent post so thanks for taking the trouble. I was starting to think that perhaps the one side of the centre section had a long interference spigot and after 30+ years may be corroded and best left.


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