Good thinking with the timken bearings! Would you be able to post the part numbers? With all these bearing stories I think I better have a spare set handy for next year.The second time my bearings went out on my 8120 I went to my local bearing shop and got good timken bearings, with real locking collars. That was 800 hrs ago, never touched them since. I think the problem is those expensive crappie bearings case is selling, they have a tin ring for a lock collar, if your chopper is out of balance at all that tin works out then the bearing goes. The 88 series ran regular bearings on choppers, the cr combines run regular bearings on their back beater, but the flagship case has these funny crappie ones, and guess witch one ***** up all the time.
Don't own one and haven't paid much attention to the chopper area of one either at a dealership or at a farm show, but what's the inner shaft driving? Might make for a cleaner looking machine to eliminate a separate shaft but if its going to cause expensive and damaging failures sounds like it would be better to run that shaft somewhere else.The ideal situation would be to figure out a way to run a separate jack shaft across the combine, to eliminate the need for the shaft within a shaft.
Wow that's a lot... Probably would take a totally separate shaft running through somewhere else to cure that problem, and while they are at it make it a bit larger so its not going to bend. I know metals have changed over the years but on old combines anything pulling those kind of loads that shaft sounds like it takes would have been 2" themselves. Reason I say that is years ago they wouldn't have had a shaft that big for the elevators, but that was 1/3 the grain running through them also. Same with all those other components.Basically everything on the right side of the combine is driven by that shaft inside the chopper shaft. Though I think the rotary screen is driven from a pulley on the engine itself. But the shaker, rethresher, and elevator are all driven by this shaft. Though oddly enough the shaker is powered on the left side, but it gets power from the tailings auger, which in turn is run by the big pulley on the right-hand side. Clear as mud?