Great Plains 606NT Material Rate - Manual (Page 25)

2011-10-21 Table of Contents Main Box Rates 151-122B
Great Plains Manufacturing, Inc. Table of Contents Main Box Rates 23
Native Grass Rate
The Native Grass box is for seeding fluffy, native grass
blends like Big Blue Stem, Indian Grass, Oats Grama,
and mixes of these and similar seeds. For Brome grass,
however, see “Brome Grass Seeding” on page 29.
Native Grass rate is controlled by gearbox Drive Type
and a sprocket selection.
Note: Drive Type also affects main box rate.
Series II Native Grass Drill Calibration
This method for calibration works on any type of native
grass no matter what seed type, weight, or density.
The drill’s revolutions-per-acre at the native grass cup
allows you to calibrate the output in pounds by cup
sprocket revolution per acre.
This is the most consistent calibration procedure, and
works on all types of native grasses.
To calibrate seed mix:
1. Record the weight of empty containers large enough
to hold seed metered from the native grass box. The
examples in this section presume that three rows are
sampled. For very light grasses, you may want to
sample more rows, or calibrate with Drive Type 4.
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.
Note: It is necessary to calibrate seed mix before setting
seed rate.
Note: On older model pull-type drills without the
Calibration Kit accessory, engage the clutch by
lowering the drill. Use a jack to raise the left end
wheel. Set the lock-out hub to drive engaged.
3. To calibrate using calibration crank, raise a 3-point
drill (Model 3P605NT or 3P606NT), disengage the
gauge wheel lockout (Model 605NT or 606NT), and
attach calibration crank to coupler on left-hand side
jackshaft using retaining pin.
4. Turn crank (or gauge wheel) several times to fill seed
cups with seed. Continue turning until seed falls to
the ground from each cup.
5. Place the empty containers under the disconnected
seed hoses to gather the seed as it is metered.
Figure 13
3P606NT Calibration Crank
32793
Figure 14
606NT Calibration Crank
23389
Note: Leave the lock-out hub engaged if rotating the tire
for calibration.
Note: You can also rotate the gearbox input jackshaft by
means of a wrench or socket. You may need to
remove the acremeter. Use same number of
rotations when turning the gauge wheel jackshaft,
gearbox input jackshaft or tire.