Have been having trouble breaking the Accelerator roll gears on a 2012 S77. Started last fall and broke 3 sets in a 100 hours. Thought maybe the shafts were bent so this winter pulled both shafts out and replaced them with new ones and put all new bearings in both shafts and also put new straw chopper hammers in too thinking that was causing too much load on the shaft. Took it out to harvest corn in February. Did about 250 acres and it broke some teeth off the gears again. Lugs are timed on it. Does Agco have a bad batch of gears out there or what is the deal? Thanks.