Harvester
Guest
I suspect the new rotor in the 9790 will behave similarly to the 8780, in that the rotor knives on the rotor can cause the straw to break up and overload the shoe in dry conditions. The rotor knives are nice in that they prevent material from wrapping around the rotor. If you started with the IH rotors in the 70s, you probably know what I mean. The great thing about the new rotor in the 9790 is that it seems the rotor knives are less necessary than before, because there are more rasp bars that run to the back of the rotor for separation. I would start with all the rotor knives removed and only start adding them from the rear if necessary when going into green weeds. That will give maximum shoe performance and lowest straw break-up. Remove the concave overlap (left side, 2 front doors) and rotate the rotor by hand (rotor in neutral) to remove the rotor knives. The rear ones you can loosen through the grates and just push to the front of the cage to remove through the overlap opening. Takes 30 minutes or so. Set your concave deflectors wide to start with, as the 9790 has a wider shoe than the 8780, so use it. loosen the two 1_4" bolts and slide the deflectors open. Adjust as necessary to uniformly load shoe. If you are running the corn concaves with wires installed (5_8" spacing),you'll probably want to start with at least one blanking plate over the first concave, and possibly two, depending on conditions. These are stored under the left side panel of combine and install easily. Set chaffer at 5_8 - 3_4" and sieve to about 1_4". Start with rotor at 1000 and back off if necessary. Faster is better. Run fan wide open or nearly so. Should impress you, in more than performance. These are just simple, forgiving, and inexpensive to own combines. The longer unloader is something I was told at a show to expect pretty soon. The variable speed feeder they said may take a while longer, but is probably coming. Good luck and keep us posted!