Great Plains 1205NT Operator Manual - Manual (Page 32)

1205NT
150-131M 3/28/12
30
Position Feed-Cup Doors
See Figure 22. For wheat and other small seeds,
move feed cup door handles to highest position.
For soybeans and other large seeds, lower han-
dles to second position. If excessive seed
cracking occurs, lower handles to third position.
Move handles to fourth, wide-open position, for
seed cup clean out. Make sure all handles are in
same position before drilling.
NOTE: Do not open cup to wide open position
with seeds in the box unless complete clean out is
desired.
Check Seed Rate
NOTE: For drills built after October 1, 2005,
use the gauge wheel tire or supplied calibration
crank to calibrate. For drills built before Octo-
ber 1, 2005, use the gauge wheel to calibrate or
order the calibration crank kit available through
your Great Plains Dealer.
1. To calibrate, use either the left hand gauge
wheel or the supplied calibration crank. If us-
ing the calibration crank, attach crank to cou-
pler 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 properly and are free from foreign
matter.
3. To adjust seeding rate, decide which drive
type (gearbox) setting you need from the
seeding charts beginning on page 31. Set the
gearbox. Rotate drive tire or calibration crank
a few turns to confirm gearbox has engaged.
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
several 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 jack-
shaft 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.
Figure 22
Feed-cup Door Handle Adjustment
14744
Feed-cup
door handle
8. Check that the three seed cups have plenty of
seed coming into them.
9. Weigh metered seed. Subtract initial weight of
container. Divide by three. Multiply by the num-
ber of openers on your drill to determine total
pounds seeded per acre. If this figure is differ-
ent than desired, set your seed rate adjust-
ment handle accordingly.
NOTE: You may want to repeat the calibration pro-
cedure if your results vary greatly from seed rate
chart.
10. 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 slight-
ly to compensate for field conditions.
Equations for calibrating seed rate:
measured seed - empty container
3 (number of seed cups measured)
pounds per seed cup x number of openers = pounds per acre
= pounds per seed cup
23386
1205NT Calibration Crank