Great Plains V-300F Operator Manual - Manual (Page 91)

Great Plains Manufacturing, Inc. Adjustments 87
11/15/2007 148-057M-A
Disabling Fertilizer Box Drive
To prevent wear when applying only seed, and when cal-
ibrating main seed, the fertilizer shaft can be disengaged
from the drive system.
The drive is engaged when the clutch cross pin seats
in the deeper detent, pin perpendicular to the shaft.
Refer to Figure 94, a rear view of the shaft with the seed boxes
removed, and Figure 85, an exploded view from above left rear
1.
It may be necessary to remove one or both guards to
gain access to the clutch.
2. Pull the cross pin away from the shaft. Rotate 1 ⁄
4
turn. Seat in shallower detent parallel to the shaft.
To re-enable fertilizer drive:
3.
Pull the cross pin away from the shaft, and rotate it
1 ⁄
4
turn, seating it in the deeper detent perpendicular
to the shaft.
Note: The pin does not need to fully seat at this time. It
automatically drops into full engagement at the
next movement of the ground drive.
4. Re-mount any removed guards.
Fertilizer Rate Calibration
Calibration is strongly recommended. Fertilizer density
and can granularity can be substantially different from
the material used to generate the charts.
The V300F has a diverter on each fertilizer meter, which
send metered material to a calibration tray:
The V300F includes a calibration bag for weighing sam-
ples, and a spring scale:
The spring scale requires a sample of at least 2.5 kg or
5 lbs for useful precision. Typically, this requires simulat-
ing at least
1 ⁄
10
hectare or acre. If you have a scale accu-
rate at lower weights, you can use a smaller sample size.
These instructions presume a calibration using the sup-
plied accessories.
Refer to sample data and formulas at right.
1.
Correct for density, if that step was completed.
2. Consult the fertilizer rate chart in the Seed Rate
Manual.
3. Set the Range, Driving and Driven sprockets.
4. Using the rate chart, and the crank revolutions table
on page 74, determine how many crank revolutions
are required to generate a measurable sample size.
Tray Capacity 37.3 liters 1.06 bu. 1.32 cu.ft.
Scale Capacity 2.5-to-25 kg 5-to-50 pounds
Figure 94
Fertilizer Drive Clutch
22611
1 1
Example:
Desired Application Rate: 128 kg per hectare
Expected planting speed: 7 kph
Density-corrected rate: 182 kg/Ha
Range: High (16T)
Driving sprocket: 17T
Driven sprocket: 20T
Expected sample size for 1 ⁄
10
hectare: 12.8 kg
Crank revolutions for 1 ⁄
10
hectare: 320
Recommended crank rpm: 112