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Please dont quote me on the following, its something i am kinda sure about...
These two are the smaller series, only on the 300, 350, 350B crawler and 450B crawler, and not the 500 or 600.
the 92 control valve was offered 3 ways, as an open center, and two closed centers, early and late serial numbers. The 92 was available on the 300 & 400 loader tractor and the 1010 wheel loader tractors
the 9250 was an option for the 300 wheel loader and the 350B & 450B crawlers.
I think there was also like an A and maybe a B series 9250, so like a 9250, 9250A, and maybe a 9250B, but not a 100% sure.
there are a lot of crossover between them and i am not sure what was offered on the 301A, 401A etc etc etc...
Both of these are the smaller series first edition style backhoes, i have a 500, which is the 3020 industrial, with a loader and backhoe, they are a powershift transmission
you may try going to deeres online parts catalog and search for just backhoe, but im pretty sure if you looked for either the 92 or the 9250 you would get what you are looking for.
are are you looking for anyway? i mean something specifically?
I found a complete 500 loader with backhoe for parts for mine, and this winter i am hoping i can rebuild most of it, clean up a lot of issues, maybe put a turbo on it, but save for the fact that it does not have front wheel assist, its a very solid workhorse, and will preform right up there with newer cases and deeres, and it is just about as easy on fuel.
Oh yea, i also have a 400/401 with a front end loader on it and a parts 350 i think.