Great Plains 3N-4025P Operator Manual - Manual (Page 36)

3N-4010P, 3N-4015P, 3N-4020P and
3N-4025P
196-286M 4/23/2010
34
10 Series Openers
Opener Down Pressure
Refer to Figure 24
Opener springs provide the down pressure nec-
essary for opener disks to open a seed trench.
The springs allow the openers to float down into
depressions and up over obstructions.
You can adjust down pressure individually for
each opener. This is useful for penetrating hard
soil and planting in tire tracks.
Use enough down pressure to cut the seed trench
and maintain proper soil-firming over seed. Ex-
cessive opener down force will lead to premature
wear on opener components.
Refer to Figure 25
To adjust down pressure, use adjustment tool
stored under walkboard. Position tool in hole on
spring mounting plates, and pull down as shown.
Move adjustment cam to the new setting.
Refer to Figure 26
Minimum and maximum settings are indicated by
position of adjustment cam.
18272
18409
Minimum setting Maximum setting
Figure 26
Adjustment cam
Figure 25
Adjustment tool
Figure 24
Opener springs
12104