Great Plains V-300F Operator Manual - Manual (Page 83)

Great Plains Manufacturing, Inc. Adjustments 79
11/15/2007 148-057M-A
Calibrating Main Box Seed Rate
The V300 and V300F has diverters on each main seed
box meter, which send metered seed to a calibration tray:
The V300 and V300F includes a calibration bag for
weighing samples, and a spring scale:
The spring scale requires a sample weight of at least
2.5 kg or 5 lbs for useful precision. Typically, this requires
simulating at least
1 ⁄
10
hectare or acre. If you have a
scale that is accurate at lower weights, you can use a
smaller sample size.
These instructions presume a calibration using the sup-
plied accessories.
1. Using the seed rate chart, and the crank revolutions
table on page 74, determine how many crank revolu-
tions are required to generate a measurable sample
size.
2. Set the initial Drive Type, Meter Scale and Meter
Doors per the chart and seed characteristics.
3. Make sure the calibration bag is empty and clean.
Hang it from the scale, and adjust the knurled disk
on the top of the scale until the scale reads zero (0).
Refer to Figure 86
4.
Rotate the latch and remove the tray . Empty
and clean it. Re-insert it with the opening facing up.
5. Disengage the clutch for fertilizer drive (see
page 86), and remove the drive chain from small
seeds (page 117).
6. If the drill is model V300F, adjust the seed/fertilizer
divider for the intended field operations (see
page 33).
7. Load about 50 kg or 100 lbs of seed in the main seed
box. Distribute it evenly over all meters.
Tray Capacity 37.3 liters 1.06 bu. 1.32 cu.ft.
Scale Capacity 2.5-to-25 kg 5-to-50 pounds
Example:
Seed: Barley
Desired Population: 120 kg per hectare
Expected planting speed: 7 kph
Drive Type: 2
Meter Scale Setting: 65
Meter Door setting: 1
Expected sample size for 1 ⁄
10
hectare: 12 kg
Crank revolutions for 1 ⁄
10
hectare: 320
Recommended crank rpm: 112
Figure 86
Calibration Tray Removal
27252
2
1
1 2