Great Plains 1205NT Operator Manual - Manual (Page 36)

1205NT
150-131M 3/28/12
34
Small Seeds Attachment
To set and calibrate the seeding rate on the op-
tional 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
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. From the small seeds seed rate chart on page
35 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
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.
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 ad-
justment 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 small
seed box and seed level in small seeds 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
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