Great Plains 2000 Material Rate - Manual (Page 5)

Great Plains Mfg., Inc.
3
05/30/2008 118-389B
Checking Main Box Seed Rate
Check Seeding Rate
1. Record weight of an empty container large enough
to hold seed metered for one acre.
2. Place several pounds of seed over three seed
cups on an outside end of drill box. Pull seed
tubes off these three openers.
3. Raise drill off the ground. If using a hitch, insert
transport lock pins or turn 90˚ hydraulic lock valve,
depending on hitch style.
4. Turn drive gauge wheel a few turns to fill cups with
seed. Turn wheel until seed drops to the ground
from all three cups.
5. Place a container under the three seed tubes to
gather seed as it is metered.
6. Turn drive gauge wheel for one acre:
450 rotations on a 12-foot drill,
364 rotations on a 15-foot drill, or
283 rotations on a 20-foot drill.
Check that the three seed cups have plenty of
seed coming into them.
7. Weigh the metered seed. Subtract initial weight of
the empty container. Divide by three for the
amount metered by each seed cup, then multiply
by the number of drill openers for the pounds-per-
acre seeding rate. If this figure is different than
desired, adjust seed-rate handle and recheck the
rate.
Note: If your results vary greatly from the charts, you
may want to repeat the calibration procedure.
8. When drilling, note acres drilled, amount of seed
added and level of seed in drill box. If you are
seeding more or less than desired, adjust seeding
rate slightly to compensate for field conditions.
Drill
Model
Revolutions for One
Acre Hectare
12-foot 450 1112
15-foot 364 900
20-foot 283 699