Great Plains 1525P Operator Manual - Manual (Page 27)

8/14/2006 118-949M
25 Adjustments
Unit Mounted Coulter
Refer to Figure 13
The optional coulter allows the planter to penetrate tough
ground conditions and slice through crop residue so the opener
disks maintain a consistant seeding depth. It may be necessary
to increase the opener down pressure when using the unit
mounted coulter.
Coulter Adjustments
To adjust the coulter vertically, place 5/8” bolt in appropriate
hole in arm for desired height.
For distance from the bottom of double disk opener with 15”
coulter blades. Hole (1) equal, hole (2) 1/4” above, hole (3) 3/8”
below, hole (4) 3/4” below.
25 Series Openers
Opener Down Pressure
Refer to Figure 14
IMPORTANT! Do not back up with openers in the ground. To
do so will cause severe damage and opener plugging.
Opener springs provide the down pressure necessary 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 premature wear opener components. Exces-
sive down force will also cause uneven seed depth. For best
results always adjust tractor tires so they are not ahead of 30”
rows.
Refer to Figure 15
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 low-
ered position.
Opener spring
Figure 13
Coulter Adjustment
23102
Figure 14
Opener Spring
21947
Figure 15
Opener Down Pressure Adjustment
21948