Great Plains 3P806NT Material Rate - Manual (Page 24)

22 3P806NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
151-143B Table of Contents Main Box Rates 2011-10-21
14. Turn crank at a steady rate for the number of turns
specified on page 2, or until one acre or hectare is
tallied on acremeter. While turning, check that cups
have ample seed coming into them.
15. Weigh metered seed. Subtract initial weight of
container(s).
16. Divide the sample NetWeight by SampleRows (the
number of row sampled, typically 3). Multiply by
number of openers on your drill to determine the
total of pounds per acre seeded.
17. If the calibration sample is more than a few percent
different than the desired FieldRate, pick a new chart
rate based on the difference factor.
18. Find the chart rate closest to NewChart. Change the
Final Drive sprocket and Drive Type as needed. If the
correction went off the Standard chart to the low
side, consider installing the Rate Reduction kit.
19. You may want to repeat calibration procedure at the
new setting if your results varied greatly from the
Seed Rate Chart.
When drilling, check the amount of seed you are using
by noting the acres drilled, amount of seed added to drill,
and the level of seed in the box. If you suspect you are
drilling more or less seed than desired, and you have
accurately calibrated the drill to your seed, you may need
to change your sprocket arrangement to compensate for
your field conditions.
3P806NT crank rotations for 1 acre:
656
Example: the containers weighed a total of 7.66
pounds after test. NetWeight is 3.16 pounds.
3.16 7.66 4.5 – = NetWeight GrossWeight ContainerWeight – =
Example: MeasuredRate is:
13.7 lbs/ac
13.7
3.16
3
----------- 13 ×
=
MeasuredRate
NetWeight
SampleRows
-------------------------------------- OpenerCount ×
=
Example:
TargetRate = 12.25
PreviousChart = 12.0
MeasuredRate = 13.7
The new chart rate is:
NewChart = 10.7 pounds per acre
The nearest Standard chart rate to 10.7 is 11.0, or
Drive Type: 2
Final Sprocket: 24T
Alternatively, you could use the Reduced Rate chart,
which has a 10.5 rate setting at Drive Type 3, 22T.
10.7
12.25
13.7
-------------- 12.0 × =
NewChart
TargetRate
MeasuredRate
--------------------------------------- PreviousChart Ч
=