Great Plains 1520P Operator Manual - Manual (Page 27)

5/6/2010 118-732M
25 Adjustments
Adjustments
10 Series Openers
Opener Down Pressure
Refer to Figure 13
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 14
To adjust down pressure, use adjustment tool
stored under walkboard. Position tool in hole on
spring mounting plates, and pull down as shown.
Move the adjustment cam to the new setting.
Refer to Figure 15
Minimum and maximum settings are indicated by
position of adjustment cam.
NOTE: Install the chain connector link so that
the clip opening (split end) faces the opposite
of the chain travel with the retainer towards
the centerline of the opener.
Figure 13
10 Series Opener with Meter
18272
Disk
Opener spring
Adjustment
tool
Figure 14
Adjustment Tool
18409
Figure 15
Adjustment Cam Settings
12104
Minimum setting Maximum setting