
1205NT
Adjustments
31
3/7/19
150-131M
Small Seeds Attachment
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 calibration 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 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. From the small seeds seed rate chart on the next
page, 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 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 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
------------------------------------------------- = pounds per
seed cup
3 (number of seed cups measured)
and
pounds per seed cup x number of openers = pounds per
acre
1205NT Calibration Crank