Great Plains 3N-4025P Operator Manual - Manual (Page 37)

4/23/2010 196-286M
35 Adjustments
Opener Seeding Depth
A press wheel attached to each opener body con-
trols seeding depth. To maintain consistent depth,
the relationship between the bottom of the opener
disks and press wheel is fixed upwardly.
The press wheels also close the seed trench and
gently press soil over seed. To provide consistent
soil firming, press wheels are free to move down
from normal operating position. This maintains
pressing action even if opener disks encounter ob-
structions or hard soil.
Refer to Figure 27
Set opener seeding depth by adjusting T-handles.
To adjust, first raise openers slightly, then lift and
slide T-handles on top of openers as shown. Adjust
all T-handles to the same setting.
• For shallower seeding, slide T-handles forward
toward drill.
• For deeper seeding, slide T-handles back away
from drill.
Double V Press Wheel Adjustment
Refer to Figure 28
The double V closing wheels (4) can be moved in-
ward and outward to alter how they close the seed
trench and press soil over the seed.
To move the wheels (4) in toward the center of the
trench, remove one of the 1/4 spacer bushings (2)
next to the press wheel arm and position it under the
head of the bolt (1). On wider row spacings the clos-
ing wheels (4) can be moved outward by placing two
1/4 spacers (2) inside next to the press wheel arm
(3).
15 Series Openers
Seeding depth is controlled by gauge wheels
mounted on the sides of the opener disks.
Refer to Figure 29
To adjust seeding depth:
1. Raise the drill to remove weight from gauge
wheels.
2. Raise and move T-handle.
• Move T-handle ahead to decrease seeding
depth.
• Move T-handle back to increase seeding depth.
3. Move T-handles on all openers to the same lo-
cation.
12100
Decrease
seeding depth
Increase
seeding depth
Figure 29
Opener Depth Adjustment
18459
T-handle
Figure 27
Seed depth adjustment
23428
Figure 28
Double V Press Wheel