Here are some suggested that we have used in North America. This will help you get a good start and you can adjust accordingly to your conditions.
Suggested Corn Settings
Concaves: Large Wire modules in concave area. (Round bar modules are used by some operators – perhaps very wet corn – just make sure you are threshing kernels off the cob. Personnel experience has shown me that large wire modules seem to give a wider range of operating conditions.) (however, a lot of folks near the Mississippi river and east do use round bars. They seem to work best with easy threshing varieties.)
Grate Area: Use Large Skip Wire in grate area.
Rotor Configuration: Recommend standard rotor rasp bar configuration. Normal AFX Rotor with 8 spike bars on rear half. If separation is concern, 4 straight bars can be used at the rear of the rotor – grate area.
Vanes: Mid Position. In extremely hard to separate corn conditions, the very back 4 vanes can be moved to the slow position.
Rotor Speed: Base line is 380 RPM. Operators manual suggests 350 to 450 RPM. Use 1st range for rotor gear box.
Concave Clearance: Base line is 18 to 25 mm.. The width of a cob should just fit between the rasp bar and the pinch point. This is the most critical adjustment for corn. The idea is to roll the ears through the rotor and not tumble them with too wide of a setting. Too wide of a setting will tumble the ears and cause excessive sieve load with broken cobs. If you have leaf material hair pinning on the concaves, going tighter will let the cobs put a little pressure on the concave to help wipe the leaf material away. Don’t go to tight that you are quartering the cobs.
Pre Sieve: Louver opening should be thickness of a corn seed – 1/4 inch – 4th notch, perhaps 5th notch. (If you ever get grain in the cleaning fan, chances are you have the pre-sieve too wide.) We only want 15% of the grain to go through the pre sieve. If the corn is on the wetter side like 25% plus, you maybe able to use a wider setting (such as 5 or 6th notch).
Chaffer Sieve: Baselines setting is 17 mm. Note: With good dryer corn, a number some folks are using 21 to23 mm.
Shoe Sieve: Base line setting is 15 mm. Can go more if sample is clean. Some may go as high as 18 mm if condition permit.
Fan Speed: Base line is 1050 to 1150 RPM
Chopper: Low Speed (always drop stationary knives for low speed. Never chop in in low speed.)
Residue Spreaders: Adjust speed on residue spreader fans so cobs are thrown to the width of the head. If you have 30 series and newer flagship combine, adjust the mass distributor (Whales Tail) to a wider opening so cobs can get through.
Elevator Speed: Recommend that the Clean Grain Elevator is set to the high side on the pulleys. (reason is: the clean grain auger has to turn fast enough to take away high yielding corn, so it does not build up in auger trough. If you leave on Low side, this could be a second reason to possible get corn in the fan.
Suggested Soybean Settings:
Concaves: Large wire modules for the concaves
Grate Area: Use Large Skip Wire in grate area.
Rotor Configuration: Recommend standard rotor rasp bar configuration. Normal AFX Rotor with 8 spike bars on rear half.
Vanes: Mid Position
Rotor Speed: Base line is 600 to 650 RPM (Many of us usually like to take rotor speed up until I see the soybeans actually crack in the grain tank and then, back the rotor down 70 RPM’s to find the sweet spot! We then get no crackage, but can run maximum sweet spot rotor speed) This is a nice way to use for different varieties and moisture levels. Use 2nd range on rotor gear box.
Concave Clearance: 15 to 18 mm.
Pre Sieve: Louver opening should be thickness of soybean seed -3rd or 4th Notch. The long finger corn slat sieve still has a lot of opening when it is closed. We only want 15% of the grain to go through the pre sieve
Chaffer Sieve: Base line setting is 16. If you have 1 and 5/8 long finger corn sieve, you can even use a cab indicator setting less than 16 (maybe as far down to 12).
Shoe Sieve: Base line setting is 12. Perhaps, down to 9 with 1 and 5/8 inch shoe sieve.
Fan Speed: Base line is 1000 to 1050 RPM. The cleaning system fan is very efficient. Some folks only have to run 940 RPM on the fan.
Chopper: High Speed with stationary knives engaged.
Residue Spreaders: Adjust residue spreader fan speed to the higher side to try to give full head width spread. If you have 30 series and newer flagship combine, adjust the mass distributor (Whales Tail) opening so equal amount of residue is on the ground between the wheels, verses outside the wheels.
Elevator Speed: Can use high or low side of pulleys. If harvesting seed soybeans, recommend low side for a bit less chance of damage.