on you tine grates you can add a spacer on the left hand side(drivers ladder) it is about 1 inch to the bolts (8) that hold them to the frame. take all the filler plates out. there is 2 ways to set the rotor slow rpm with narrow concaves or fast rpm with wide concaves.when you have your machine set right the cob will be whole after running through the machine. to check this do a shut down test full load, before the cob runs through the chopper. we run 9770 with 12 row in 220-20 bushel corn @ 18 %- 24% at 3.5 mph . rotor speed at 450 rpm-500 rpm, concaves @ 24-28 air at 900- 1030,round bar, no filler plates and spacers on the tine grates.