Great Plains 3N-3020P Material Rate - Manual (Page 33)

12/1/2009 196-248B
Great Plains Mfg., Inc. 33
Note: To avoid having to turn the drill meters dur-
ing rate check, remove the four chains driving
the meter shafts.
5. Remove hose ends from the openers of the
three seed cups being measured.
6. Turn contact wheel clockwise a few turns to fill
cups with seed and until seed drops to ground
from all three hoses.
7. Place a container under the three hoses to
gather seed as it is metered.
8. Turn contact wheel clockwise 420 revolutions.
Check in box to make sure seed cups have
plenty of seed covering them.
9. Weigh measured seed. Subtract initial weight
of empty container. Divide by three for the
amount metered by each cup, then multiply by
the number of drill openers for the pounds-
per-acre seeding rate.
10. If seeding rate is different than desired:
• Double check transmission sprocket and
drive range sprocket combinations.
• Check to be sure all three seed cups are cov-
ered with seed.
• Adjust seed-rate handle accordingly.
11. When finished reconnect seed hoses to op-
ners.
Equations for calibrating volumetric seeding rate:
measured seed empty container –
3 (number of cups measured)
----------------------------------------------------------------------------------------- pounds per cup =
pounds per cup number of openers × pounds per acre =
19114