Great Plains V-300F Operator Manual - Manual (Page 89)

Great Plains Manufacturing, Inc. Adjustments 85
11/15/2007 148-057M-A
Fertilizer Density Correction
The Fertilizer Rate charts in the Seed Rate manual are
based on a StandardDensity of:
1.04 kg/liter or 65 pounds/cu-ft.
If your material is substantially different, and/or if you
don’t intend to calibrate, calculate a CorrectedRate
before consulting the rate chart.
1. Obtain your material density from the packaging. If it
is not documented, you will need to weigh a known
volume of it, and convert the results to kilograms-
per-liter or pounds-per-cubic-foot.
2. Compute the correction factor.
3. Apply the correction factor to your desired rate.
4. Look up the setting for the CorrectedRate in the Fer-
tilizer Rate charts.
5. The CorrectedRate is used only to obtain an initial
setup for the sprockets. Calibrate to your real field
rate (the ActualRate).
Setting Fertilizer Drive Range
Refer to Figure 88
1.
Consult the fertilizer rate charts in the Seed Rate
manual. Determine which of the following ranges is
necessary for your intended application rate:
2. Remove the guard at the fertilizer drive (behind
the left lift cylinder)
3. Loosen idler on input chain (sprocket ). Exchange
sprockets from storage trees. Engage idler.
Leave
1 ⁄
4
in (6.4mm) slack in the long chain span.
4. If changing to or from Special High Range, also
exchange the final drive sprocket
. This sprocket is
secured by set screw, and not by a pin.
5. Engage the fertilizer drive clutch . Pull pin away
from shaft. Rotate 1 ⁄
4
turn and release into deeper
detent. The pin fully seats at next shaft rotation.
Range
Sprockets
Relative
Rate
Input Final
Standard Low 44T 12T Slowest
Standard High 16T 12T 2.8x
Special Low 12T 12T 3.7x
Special High 12T 19T 5.8x
Example Fertilizer Density Correction
Desired Application Rate (ActualRate): 128 kg/Ha
Your Fertilizer Density:
0.73 kg/liter
CorrectionFactor:
1.04
÷ 0.73 = 1.42
CorrectedRate:
128 x 1.42 = 182 (kg/Ha)
The closest chart rate to 182 is
182.7
Standard High Range, 17T Driver, 20T Driven
CorrectionFactor
StandardDensity
YourDensity
-------------------------------------
=
CorrectedRate ActualRate CorrectionFactor × =
Figure 91
Fertilizer Drive: Range
27255
3
2
1
4 2 3
1
2
3
4