Great Plains 3PNG15 Material Rate - Manual (Page 5)

202-553B 8/17/2006
Great Plains Mfg., Inc. 5
l. Weigh the metered seed. Subtract the 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 the seed-rate han-
dle and recheck the rate.
NOTE: If your results vary greatly from the charts, you
may want to repeat the calibration procedure.
m. 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 seeding rate slightly to
compensate for field conditions.
n. When not in use, store calibration crank in out of
way location on main frame as shown below.
Small Seeds Attachment
To calibrate the seeding rate on the optional small seeds
attachment, follow these steps.
Refer to Figure 7
1. For the proper small-seeds sprocket arrangement
given different drive types on the main drill box. Ar-
range the sprockets on the small-seeds attachment
according to which drive type you will use on the
main drill box.
NOTE: For accurate metering on the small seeds at-
tachment, the main drill box sprockets must be set to
drive type 1, 2 or 2A.
2. Set the seed-rate adjustment handle on the small
seeds attachment as indicated by the chart on
Small Seeds Attachment Seed Rate Chart, page 9.
3. Calibrate the small seeds attachment to your mate-
rial by following the steps under Check Seeding
Rate, page 4.
Figure 7
Small Seeds Sprocket Arrangements
16399
3PNG Calibration Crank Storage
23468
Equations for calibrating seed rate:
measured seed empty container –
3 (number of seed cups measured)
---------------------------------------------------------------------------------------------- pounds per seed cup =
pounds per seed cup number of openers × pounds per acre =