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Get that combine ready to roll

Agriculture.com Staff 09/25/2008 @ 9:26am

Keep your speed in check, make sure the air's flowing through the machine and take adjustments one step at a time. These are just a few ways to make sure your combine doesn't end up sitting at the field's edge while valuable harvest time passes you by.

Safety is of utmost importance during harvest time. Remember a few key things here, says Iowa State University (ISU) Extension agricultural engineer Mark Hanna.

"Although most operators are familiar with traumatic injuries associated with the limits of human reaction time around falling grain heads or spinning corn stalk rolls, many more chronic injuries are associated with falls from combines," Hanna says. "Check fire extinguishers and clean debris from the combine periodically to avoid both fire danger and slips on residue, mud, or (later in the season) ice/snow."

With maintenance and machine adjustments during harvest, Hanna offers the following tips, according to an ISU report:

  • To minimize seed coat damage, start with the lowest recommended rotor or cylinder speed and use only enough speed to adequately thresh grain while keeping loss to acceptable levels.
  • Cleaning fan airflow is normally set at a high level, and then reduced just below the point where grain is blown out the rear of the cleaning shoe.
  • Adjust one setting at a time, and then evaluate the change.
  • If different planting dates have caused maturity differences in the same field, consider harvesting by maturity and dry-down rather than by field. Areas with lodging should be moved earlier in the harvest schedule.
  • Four soybeans or two kernels of corn per square foot equals one bushel per acre grain loss. Machine-related losses should be about one bushel per acre or less if the crop is standing well.

There are also crop-specific maintenance steps that can ensure both safe and efficient combine operation. With soybeans, it's important to be well aware of the crop's stage of development, as that can dictate how easy -- or difficult -- the beans will be to combine.

"Delayed plantings and slower than normal canopy closure in soybeans will present unique harvesting challenges this fall. Research suggests that 90 percent of machine losses are at the head, with the majority of those occurring at the cutterbar," Hanna says. "Lower pod set from slow canopy closure in 30-inch rows makes condition and operation of the flexible cutterbar and header height control potentially more important than usual. Combine operators should periodically stop the combine and measure losses, particularly early in the season as conditions change and time may be more available. Each one inch of uncut stubble can result in a one bushel per acre yield loss.

"If soybeans are small, cleaning fan speed may need to be reduced to avoid blowing soybeans out of the combine. Similarly, if sieve openings have been reduced slightly for small soybeans, airflow should be reduced a bit to compensate as greater air velocity is created at a given flow when the sieve opening is narrowed," he adds.

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