2Phat4Rapha wrote:Brucey wrote:2Phat4Rapha wrote:NGAT.JPG
Never mind NIG, how about no gears at all?
I've seen that happen a few times. What usually causes it is either no lube or no hardening. When it does happen you normally still have the middle gear, but not 1 or 3.
BTW that axle is a NIG SA 3s one made by SunRace in Taiwan. The design is inherently stronger than the old AW axle (with a riveted sun pinion) but I am not sure the current QA is quite as good as it could be. I've seen a few duff parts, more than I'd like.
Thanks as always Brucey. Internals were dry as a bone. I would have expected the planet pinions to be damaged also but they were fine. Even measured them with a Mitutoyo micrometer against new ones. Perhaps also points to insufficient hardening. There might have been a middle gear but it was just a hub on its own as an eBay purchase for refurb so can't say for certain.
BTW its worth noting that even if the axle is as hard as the pinions, the sun pinion would still be expected to wear about x4 as fast; it has four pinions bearing against it, so it is somewhat outnumbered.