Great Plains 3S-4010HDF Material Rate User Manual
Page 8
Great Plains Mfg., Inc.
6
3S-4010HD and 3S-4010HDF
196-522B
01/29/2009
6.
Record the weight of one to three empty containers
collectively large enough to hold seed metered for
6% of one acre or hectare.
7.
Place several pounds or kg of seed over three seed
cups on the outside end of the right drill box. Pull
lower end seed hoses off of these drops at the
opener end.
8.
Turn the calibration crank several times to fill seed
cups. Turn until seed drops to ground from each
hose.
9.
Place empty container(s) under the three hoses to
gather metered seed.
10. Turn crank for one acre (45.1 rotations) or one hect-
are (111.4 rotations). While turning, check that cups
have ample seed coming into them.
11. Weigh metered seed. Subtract initial weight of con-
tainer(s).
12. Divide the net seed weight by three. Multiply by num-
ber of openers on your drill to determine the total of
pounds-per-acre seeded.
13. The Seed Rate Handle scale is a percentage of
meter opening, and is quite linear near scale center.
Calculate a new scale setting based on the test.
Note: You may want to repeat calibration procedure if
your results varied greatly from the Seed Rate
Chart, or if you must operate near the ends of the
Seed Rate handle scale (0-20 or 90-100).
14. Set the center and left drill sections to match the
now-calibrated right section.
15. With calibration complete, Reinstall fertilizer chain (if
removed) and reconnect seed hoses.
When drilling, check seeding rate by noting acres drilled,
amount of seed added to drill and seed level in drill box.
If you are seeding more or less than desired, adjust rate
slightly to compensate for field conditions.
For example:
three empty 8 oz. containers weigh a total of:
1.5 lb.
For example: the containers weighed a total of 4.0 lb
after test:
2.7 lb net
2.7
4.2
1.5
–
=
NetWeight
GrossWeight
ContainerWeights
–
=
For example:
on the 64-row 7.5in drill:
57.5 lb/ac
57.5
2.7
3
------
64
×
=
MeasuredRate
NetWeight
3
-------------------------
OpenerCount
×
=
For example:
the target rate was 50 lb/ac, and the initial scale 40:
the new scale setting is:
35
35
50
57.5
---------
40
×
=
NewScale
TargetRate
MeasuredRate
----------------------------------
OldScale
Ч
=