Great Plains 3S-4000HD Assembly Instructions - Manual (Page 28)

24 3S-4000/F/HD/HDF SGS Table of Contents Index Great Plains Manufacturing, Inc.
133-322M Table of Contents Index 2012-12-11
11. Divide the net seed weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre seeded.
12. 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).
13. Set the center and right drill sections to match the
now-calibrated left section.
14. With calibration complete, Reinstall fertilizer chain
(if removed), reconnect seed hoses, and lower
gauge wheel to ground.
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:
a 7.5in drill has 63 rows:
14.7 lbs/ac
MeasuredRate
NetWeight
3
------------------------- RowCount Ч =
14.7
0.7
3
------- 63 Ч =
For example:
new scale:
34
NewScale
TargetRate
MeasuredRate
---------------------------------- OldScale Ч =
34
10
14.7
--------- 50 Ч
=