Great Plains 1205NT Material Rate - Manual (Page 3)

Great Plains Mfg., Inc.
1
04/12/2007 150-131B
Main Seed Box Planting
Calibrating the seeding rate requires four steps:
1. selecting one of four drive types,
2. setting the seed-rate handle,
3. positioning the feed-cup door, and
4. checking the seed rate.
Refer to the seed rate charts beginning on page 4.
These charts list the proper drive type and seed-rate-
handle settings for various seeds and seeding rates.
The seed rate charts are based on cleaned, untreated
seed of average size and test weight. The rates are
based on 295/75/R22.5 rib implement tires. Many fac-
tors will affect seeding rates including foreign material,
seed treatment, seed size, field conditions, tire pres-
sure and test weight. Minor adjustments likely will be
needed. Set and check the seeding rate using the pro-
cedures on page 2, then adjust the rate as necessary.
Select Drive Type
Refer to Figure 1
The gearbox is designed to give you a variety of drive
speeds for different types of seeds and rates. It is a lin-
ear shift pattern design with constant mesh gearing
and totally sealed to keep dirt out. No lubrication is
required unless service is needed.
The gearbox brass indicator plate is positioned so the
side with “1” is closest to the center of the drill.
To set the gearbox move the selector handle until
the desired drive type appears in the window on the handle
Set Seed-Rate Handle
Refer to Figure 2
The seed rate handle controls the percent engage-
ment of the seed sprocket in each seed cup.
1. Loosen wing nut under handle.
2. Set indicator to just past value from seed rate
chart.
3. Tighten wing nut.
Figure 1
Gearbox Handle Adjustment
14742
1
2
Gear Box Ratios
Setting 2 is 2.06 Times Faster Than 1
Setting 3 is 3.08 Times Faster Than 1
Setting 4 is 5.03 Times Faster Than 1
1
2
Figure 2
Seed Rate Handle
12927
1
2
1
2