Great Plains 1006NT Material Rate User Manual
Page 22
Great Plains Mfg., Inc.
20
150-287B
04/20/2007
Great Plains Calibration for Series II Native Grass Drills
Our method for calibration will work on any type of
native grass no matter what seed type, weight, or den-
sity. See page 24 for steps specific to Brome.
We give you the drill’s revolutions per acre at the native
grass cup and allow you to calibrate the output in
pounds by cup sprocket revolution per acre.
This is the most consistent calibration procedure that
will work on all types of native grasses.
Note: It is necessary to calibrate for the seed mix
before setting seed rate.
To calibrate seed mix:
1.
Record the weight of an empty container large
enough to hold seed metered from the native
grass box.
2.
Fill three or more compartments at least
1
⁄
2
full of
seed in the native grass box. Pull seed hoses off
openers under the compartments.
3.
To calibrate, use right-hand gauge wheel or sup-
plied calibration crank.
4.
To calibrate using right-hand gauge wheel, lower
the drill hydraulically to planting position in order to
activate clutch. Raise right drive wheel tire off the
ground using a jack. Engage gauge wheel lockout
on the right-hand side.
5.
To calibrate using calibration crank, disengage
gauge wheel lockout, and attach calibration crank
to coupler on right-hand side of gauge wheel jack-
shaft using retaining pin.
6.
Turn gauge wheel or crank several times to fill
seed cups with seed. Continue to turn gauge
wheel or crank until seed falls to the ground from
each cup.
7.
Place the empty container under three seed hoses
to gather the seed as it is metered.
8.
Note the Drive Type
on the gearbox (1, 2, 3, 4)
and the range sprocket
sprockets). This information will be used later in
the calibration process.
9.
Rotate gauge wheel or calibration crank for one
acre. See table at right for rotations per acre.
10. Check that the three seed cups have plenty of
seed coming into them.
Figure 8
Calibration Crank
23386
Figure 9
Native Grass Drive Type
20484
2
1
3
Drill
Model
Revolutions for One
Acre
Hectare
706NT
595
1470
1006NT
411
1016
2