Hello, I'm renewing worn parts of my 1971 gearbox and among other things the mainshaft second gear teeth are pitted so I ordered part number 040418 from a shop. On a dry run build up I found the input and output shafts wouldn't turn freely. A process of elimination of new parts lead to finding the new 2nd gear as the problem. As far as I can gather it looks as if I've been supplied with a later gear denoted by the grooves cut into the dogs. Can anyone please confirm from my photo?
Yes I think thats what Mick…
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Yes, the one with the groove…
Yes, the one with the groove is the later gear, p/n 06.4640. It must be used with the corresponding layshaft gear p/n 06.4639 (which has a similar groove).
The one on the right (with the groove) is not a genuine gear but an RS copy, and doesn't look that new either.
The pitting I can see on the one on the left is fairly typical and doesn't look too bad, nearly as good as the one on the right. I'd say either buy a new pair from AN or put it back together as it was and don't worry about it - it's not a Honda.
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Thanks Stan. In fairness to…
Thanks Stan. In fairness to the shop, it was sold as new but shop soiled, with light surface corrosion but not on the gear teeth and I don't think they have been aware of the gear design changes, just as I wasn't. I'll return the gear and do as you say. And you're right, it's agricultural, not Honda. My collection of reamers has increased.
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it's a RSS gear and…
it's a RSS gear and incorrect material and hardening and of questionable dimensions - DO NOT USE IT.
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Thanks Ashley, I appreciate…
Thanks Ashley, I appreciate you warning me of it, a near miss for the unwary.
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Yes I think thats what Mick Hemmings points out in his DVD.