Great Plains 3N-4025P Operator Manual - Manual (Page 48)

3N-4010P, 3N-4015P, 3N-4020P and
3N-4025P
196-286M 4/23/2010
46
Refer to Figure 56
Minimum and maximum settings are indicated by
position of adjustment cam.
Each notch on the adjustment cam will increase
the down pressure on the opener springs. Use the
chart below as a setting reference.
Spring Down Pressure
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
obstructions or hard soil.
Refer to Figure 57
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. Ad-
just all T-handles to the same setting.
• For shallower seeding, slide T-handles for-
ward toward drill.
• For deeper seeding, slide T-handles back
away from drill.
Cam Notch Pounds
one 250
two 275
three 310
four 370
five 430
six 490
21966 Minimum setting
Maximum setting 21967
12100
Figure 57
Seed Depth Adjustment
Figure 56
Adjustment Cam Settings