Great Plains 1205NT Material Rate - Manual (Page 14)

Great Plains Mfg., Inc.
12
150-131B 04/12/2007
Small Seeds Planting
To set and calibrate the seeding rate on the optional
small seeds attachment, follow these steps:
Note: For drills built after October 1, 2005,
calibrate using gauge wheel or supplied calibra-
tion crank.
For drills built before October 1, 2005,
calibrate using gauge wheel or order the calibra-
tion crank kit available through your Great Plains
Dealer.
1. To calibrate, use either the left hand gauge wheel
or the supplied calibration crank. If using the cali-
bration crank, attach crank to coupler on gauge
wheel jackshaft with retaining pin and disengage
lockout on drive wheel.
2. Rotate left hand gauge wheel or calibration crank
to see that feed cups and drive are working prop-
erly and are free from foreign matter.
3. From the small seeds seed rate chart on page 13
find the setting number for desired feeding rate
(and row spacing). Move the small seed cup
adjustment lever to that setting number.
4. Record weight of an empty container large enough
to hold seed metered for one acre.
5. Place several pounds of seed over three seed
cups on an outside end of drill box. Pull seed
tubes off of these three openers.
6. Turn drive gauge wheel or calibration crank sev-
eral times to fill seed cups with seed. Turn wheel
or crank until seed falls to the ground from each
cup.
7. Rotate drive gauge wheel or calibration crank
346 rotations.
This is equal to one acre.
Note: You can also rotate the gauge wheel jackshaft by
means of a wrench or socket. If rotating gauge
wheel jackshaft, disengage the lockout on the
drive wheel and use same number of rotations as
for rotating drive wheel.
8. Check that the three seed cups have plenty of seed
coming into them.
9. Weigh metered seed. Subtract initial weight of con-
tainer. Divide by three. Multiply by the number of
openers on your drill to determine total pounds
seeded per acre. If this figure is different than
desired, set your seed rate adjustment handle
accordingly.
Note: You may want to repeat the calibration procedure
if your results vary greatly from seed rate chart.
10. When drilling, check seeding rate by noting acres
drilled, amount of seed added to small seed box
and seed level in small seeds box. If you are seed-
ing more or less than desired, adjust seeding rate
slightly to compensate for field conditions.
Figure 5
1205NT Calibration Crank
23386
Drill
Model
Revolutions for One
Acre Hectare
1205NT 346 855
MeasuredSeed EmptyContainer –
3
---------------------------------------------------------------------------------- PoundsPerSeedCup =
PoundsPerSeedCup NumberOfOpeners × PoundsPerAcre =