Great Plains 1205NT Operator Manual - Manual (Page 31)

3/28/12 150-131M
29 Adjustments
Seeding Rate
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
31. 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, un-
treated seed of average size and test weight. The
rates are based on 295/75/R22.5 rib implement
tires. Many factors will affect seeding rates includ-
ing foreign material, seed treatment, seed size,
field conditions, tire pressure and test weight. Mi-
nor adjustments likely will be needed. Set and
check the seeding rate using the procedures on
page 30, then adjust the rate as necessary.
Select Drive Type
The gearbox is designed to give you a variety of
drive speeds for different types of seeds and
rates. It is a linear shift pattern design with con-
stant mesh gearing and totally sealed to keep the
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.
See Table 3 for gear box ratios.
Set Seed-Rate Handle
Position the seed-rate handle, see Figure 21, to
setting indicated on seed rate chart. To adjust,
loosen wing nut under handle. Slide handle until
indicator lines up with correct setting.
Gearbox
selector
handle
Figure 20
Gearbox Handle Adjustment
14744
Table 3
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
Seed-rate
handle
Figure 21
Seed-rate Handle Adjustment
14744