1205NT
Adjustments
27
3/7/19
150-131M
Position Feed-Cup Doors
Refer to Figure 22
For wheat and other small seeds, move feed cup door
handles to highest position. For soybeans and other
large seeds, lower handles 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 October 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 using the calibration
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 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 next page. 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 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
container. 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 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.
Equations for calibrating seed rate:
measured seed - empty container
------------------------------------------------- = pounds per
seed cup
3 (number of seed cups measured)
and
pounds per seed cup x number of openers = pounds per
acre
Feed-cup
door handle
Figure 22
Feed Cup Door Handle Adjustment
1205NT Calibration Crank