Great Plains 3S-4010HDF Material Rate - Manual (Page 7)

Great Plains Mfg., Inc.
5
01/29/2009 196-522B
Main Box Seed Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Seed Rate Charts, and
your seed and conditions. To accurately achieve your tar-
get population, Great Plains recommends calibrating.
Perform the calibration with the drill unfolded and low-
ered to field position. Turn off or disconnect power to the
clutches.
Refer to Figure 5
1. Lower drill. Set MASTER switch on clutch control
box to OFF position.
2. Remove the calibration crank from its storage loca-
tion on the right section drive. Store the pin on the
stob.
3. On the right drill section, if fertilizer rate is not also
being calibrated at the same time, and fertilizer is
present, remove the fertilizer drive chain.
Refer to Figure 6
4. Install crank on clutch shaft of right section.
Crank rotation is clockwise, facing to drill left.
5. Use crank to turn clutch shaft and check that the
drives and seed cups are engaged, working properly
and free from foreign material. If not already done,
set the Drive Type, Seed Rate Handle and Seed Cup
Doors across the drill.
Figure 5
Stored Calibration Crank
29240
ll C
Figure 6
Installed Calibration Crank
28180
For example:
on a drill with a row spacing of:
7.5 inches
and a row count of:
64
you desire to plant barley at:
50 pounds per acre
which, from the Barley Drive Type 2 chart,
is an initial Seed Rate Handle scale setting of:
40