INITIAL SETTINGS
Corn Head Clinic Guide - GT
HEAD SPEED
Excessive butt shelling and poor feeding can occur from the head being operated either TOO FAST or TOO
SLOW. The speed that the corn head operates is critical to maintain proper performance with the Drago corn
head. Any time the head is adapted to fit a different combine, the gearing should be checked to verify it is
correct. Contact your dealer to determine the correct gearing for your combine.
The corn head should be operated in the 630-700rpm range. The recommended initial speed is 650-675rpm.
Changes can be made to this speed to suit different conditions.
Use the formula below to determine the correct combine feeder house speed for the desired head speed.
Please note that some combines do not display the actual feeder output speed in the cab. If this is encountered
the best practice is to use a hand tachometer on the output shaft of the feeder house.
=
Example:
A Gleaner S88 combine with a variable speed feeder house drive. The monitor in the cab is showing 510 rpm
feeder speed.
- This model of combine requires a 1.5 multiplier be added to the in-cab feeder speed reading due to the
feeder speed being monitored at a different point in the system.
o = 510 1.5
o Actual feeder speed for this example is 765 rpm.
- Determine which driveR and driveN gears are currently installed on the corn head.
o The driveN gear on the heavy-duty gear drive is always 30-tooth. Only the driveR gear is
changed.
o For this example, the driveR is a 26-tooth gear and the driveN is a 30-tooth gear.
=
765 26 ℎ
30 ℎ
This works out to 663rpm actual head speed.
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