Great Plains NG12 Operator Manual - Manual (Page 16)

NG12
202-457M 8/5/2004
14
Seeding Rate Adjustment
To calibrate the seeding rate, the seeder must be
hooked to the tractor that will be used in the field
and the hydraulic drive must be hooked to the
tractor remotes.
Calibrating the Hydraulic Drive, Drop Seeder
box
1. Determine your desired planting ground
speed in mph and your seeding rate in lbs/
acre.
2. Look at the seed rate chart for your desired
planting speed, and choose the seed cup
shaft rpm for the desired rate.
3. With the tractor parked and in neutral, adjust
tractor throttle to field rpm and engage hy-
draulic drive.
4. Set the seed cup shaft rpm on your Drop
Seeder box using a tachometer.
5. Place the desired seed for calibration over 5
seed cups in your Drop Seeder box. Place
catch containers below the five seed cups.
6. Run the seed drive for a known amount of
time (i.e. 5 minutes) or until you catch a
weighable seed sample. Record the time.
Weigh the total amount of seed caught from
the 5 seed cups in pounds using an accurate
scale.
7. Determine the actual seeding rate of the
caught seed using the equation at the bottom
of this page.
Refer to Figure 4
8. Stop hydraulic drive. If shaft is turning too
slowly or quickly, loosen black knob and ad-
just flow control on hydraulic drive. Move lever
down to increase rpms. Move lever up to re-
duce rpms.
9. When satisfied with flow-control setting, lock
black knob.
Note: If the actual seeding rate is not equivalent to
your desired seeding rate, increase or decrease
the seed cup shaft rpm accordingly. Repeat steps
3 thru 6 until desired seeding rate is achieved.
Adjustments
Figure 4
Flow Control Dial
18164
(Weight of seed caught in lbs.) x (115.5)
(Amount of time to catch seed in minutes) x (Planting ground speed in mph)
Seeding rate (lbs/acre)=