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TR2/3/3A Hub Bearing Adjustment for TR3 w/Disc Brakes

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Tropical TR

Jedi Hopeful
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I saw this discussion before but couldn't find it. Is the TR Service Instruction of Oct 56 (attached) the best guide for hub bearing adjustment/tolerances for the disc brake TR3s? Regards, Walter



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Seems as good as any other procedure to me. Some later Triumph and other manuals suggest torquing to a whopping 5 lb./ft. then backing off as needed to find the hole for the cotter pin. I'm guessing most "fingers" could probably achieve that 5 lb./ft. figure without much difficulty. ;)
 
FWIW, you can find a more legible version of the above TSB at https://www.tr3a.info/PDFs/1956bul.pdf (scroll down to pages 13-14)

If you are installing a new felt seal, then I prefer the instructions given in the TR4 workshop manual. Basically the same as above, except you do an initial setting without the felt installed. Mark the position of the nut, pack the bearings, install the felt, then put the nut back to the mark.
Fronthubassembly.jpg~original


Also FWIW, the later procedure with the 5 ftlb says to back off a full flat, which leads me to believe that they don't expect you to do 5 ftlb with your fingers (I know I can't, on a nut that size). I believe the intent was to ensure the felt got compressed enough, but even that is not always enough.
 
Thank you very much, gentlemen. Happy New Year. - Walter
 
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