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Rage10
Posted on Tuesday, December 24, 2019 - 07:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey all, so my service manual has penciled in for then rotor nut torque,
210 ftlbs, back off 720
210 ftlbs, back off 720
300 ft lbs final.
What are the 210 for? I assume to set the rotor on the shaft but shouldn't the 300 set that?
The only other place I can find this spec is on twin motorcycles site. I trust their judgment on this but what's it for?
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Anakist
Posted on Tuesday, December 24, 2019 - 08:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Never done it but my guess is the rotor is a friction fit, so if you just do it up once everything binds up and it is tight and good to go. Then the bike starts and everything rattles and changes temp so it relaxes and moves further onto the shaft and the nut is then loose.

And there is friction on the thread engagement too. Doing it up to 210, then releasing then going to 210 again will do the nut up more since you aren't fighting the rotor going on as well as the nut spinning.

Usually (on draglines and power stations) we just rattle gun them up freaking tight (as tight as you can get it with a 1.5" drive air gun or a flogging spanner and a sledge hammer) and it is fine because they are designed for way more abuse than we can dish out. Or we end up having to do bearing caps at 30%, 60%, 100%, 100% of 127lbsft with a 3/8" drive thin wall socket and hope you don't break more than they have in the store!

James
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Rage10
Posted on Tuesday, December 24, 2019 - 10:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah that's about what figure. The rotor slips right on. I'm going to put 609 on the splines to take the play out.
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Rage10
Posted on Wednesday, December 25, 2019 - 12:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

All on and tightened. Since I dont have a 300 ft lb torque wrench, I used the ole, measure so far from the pivot of the 24" wratchet fortunately i gained a few lbs since the last time I had to do this.
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