Great Plains 3N-3020P Operator Manual - Manual (Page 35)

4/23/2010 196-248M
33 Adjustments
Opener Adjustments
Opener Down Pressure
Refer to Figure 14
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.
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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 15
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 16
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Minimum and maximum settings are indicated by
position of adjustment cam.
Minimum setting Maximum setting
Figure 16
Adjustment cam
Figure 15
Adjustment tool
Figure 14
Opener springs
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