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Topic: Georotor shaft key breaking on my White 2-155
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big roller

08-15-2015 05:58:57

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I have a later Series 2 with the updated georotor. The original bevel gears got damaged after the nut fell off the main pump drive shaft.

So I ordered a shaft and drive gear from Rock Valley Tractor Parts. We noticed the shaft used a 3/16x 3/4 woodruff #9 key instead of the 3/16x 1 1/8 #16 key the shaft we took out used. We installed them and it worked fine for a few days but then sheared. We replaced it again with a hardened key from agco and it sheared again. Turns out the shaft and gear we bought were from the earlier 2-155 tractors. Now I have learned that the later production georotors are 1.5 thick instead of 1 and the later shaft and gear have 24 to 26 teeth (ratio of 0.92) instead of the 26 to 24 teeth (ratio of 1.08) the older ones have. So it turns out that, it is now turning 17% faster and running a pump 50% bigger. It appears that bigger load is most likely the reason the smaller key shears.

Now I am looking for a solution. Can a shop cut the key way to the longer/bigger size? And if so, would it handle the load after?

Would also using loctite (preferably blue) on the shaft help?

Failing that could I get the later 26 tooth shaft with the bigger key and match it up to the 26 tooth drive gear now on the gear pump drive shaft? If the tooth size and pitch are the same adjusting the spacing should work. Has anyone tried doing any of this and does anyone know what will work or not?

I really don't want to take everything apart and change that drive gear all over again.

Notes: The key way is tight and not worn so that's not the problem either.

The shaft seems to be hardened so I do not know how difficult it will be to cut that keyway bigger.

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