Great Plains 606NT Material Rate - Manual (Page 7)

Great Plains Manufacturing, Inc. Table of Contents Main Box Rates Main Box Seed Rate 5
2011-10-21 Table of Contents Main Box Rates 151-122B
Main Box Seed Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Seed Rate Charts, and
your seed and conditions. To accurately achieve your
target population, Great Plains recommends calibrating.
Due to the large number of crank revolutions per acre
(913 or 995) and per hectare (2256 or 2458), a practical
calibration is a simulation of
1 ⁄
10
th
acre or
1 ⁄
10
th
hectare.
1. Estimate the sample sizes.
2. To perform this calibration, you need a scale that is
accurate at the aggregate sample size, and three (3)
light containers, each capable of holding the
expected SamplePerRow. Record the empty
container weights.
3. For a 3P605NT or 3P606NT drill, raise the drill so
the gauge wheel is out of ground contact.
For a 605NT or 606NT drill, disengage the lock-out
hub (see Operator manual), to permit independent
rotation of the main jackshaft. The drill may be raised
or lowered for calibration. Leave the lock-out hub
engaged if rotating the tire for calibration.
Crushing Hazard:
Install lift locks on a raised 605NT or 606NT drill.
4. Remove the calibration crank from its storage stob.
Store the retaining pin on the stob.
Refer to Figure 7 or Figure 8
5.
Place the hex socket of the crank on the left end of
the main jackshaft.
Note: On the 605NT or 606NT 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.
Note: On the 3P605NT or 3P606NT you can also rotate
the gearbox drive shaft with wrench or socket.
6. Pull the seed hoses off the top of three opener seed
tubes, at the top of the openers. Place the hoses into
each sample container.
Figure 7
3P606NT Calibration Crank
32793
Example: You want to apply barley at 60 pounds per
acre with a 3P606NT drill. RateSample is:
Example: the drill has 9 rows. SamplePerRow is:
Example: 3 rows are to be used in the sampling.
ExpectedSample is:
The expected sample weight is 2.0 lb.
Example: 3 containers, each weighing 0.5lb:
ContainerWeight = 1.5 lb
6.0
60
10
------
=
0.67
6.0
9
--------
=
2.0 0.67 3 × =
RateSample
FieldRate
10
---------------------------- =
SamplePerRow
RateSample
RowCount
----------------------------------- =
ExpectedSample SamplePerRow SampledRows ×
=
Figure 8
606NT Calibration Crank
23389