Great Plains 2420F Operator Manual - Manual (Page 31)

8/14/2006
29 Adjustments
HD 10 Series Openers
Opener Down Pressure
Refer to Figure 38
IMPORTANT: Do not back up with openers in
the ground. To do so will cause severe dam-
age and opener plugging.
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 only enough down pressure to cut the seed
trench and maintain proper soil-firming over seed.
Excessive opener down force will lead to prema-
ture wear of opener components. Excessive down
force will also cause uneven seed depth.
Refer to Figure 39
To adjust down pressure, use adjustment wrench
stored under the walkboard or a 1 1/8” open end
wrench. Position wrench on the nut and pull down.
Move the adjustment cam to the new setting.
Important: Always adjust the Opener Down
Pressure with the drill raised and the openers
in their completely lowered position.
Opener spring
Figure 38
Opener Spring
21947
Figure 39
Opener Down Pressure Adjustment
21948