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1440 seperator gearbox


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Hello!  I'm chasing the leak at the input shaft into the engine.  Tonight I'm lifting the gearbox+hydro out of the combine.  So far I've learned to plan on replacing the rear main, bushing in the flywheel, the shaft it self and of course the seal.  

My main question is, is there any reason I should have major trouble getting the bevel gear off the shaft?  And are there any other parts I should be looking at replacing, and if there are what am I looking for in terms of wear?

I do plan on pulling the hydro off as well to inspect the shaft and coupler.  

I want to learn as much as I can and do as much preventive maintenence as possible, within reason obviously so any input you have on this project I would love to hear.  If you know of other posts in this forum about this project please link me to them aswell.  I've not had a lot of luck searching but that could be my error lol. 

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