Great Plains 1205NT Operator Manual - Manual (Page 29)

3/28/12 150-131M
27 Adjustments
Opener Adjustments
Opener Down Pressure
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.
Each opener spring can be adjusted for down
pressure. This is useful when penetrating hard
soil and for planting in tractor tire tracks.
To adjust the pressure, remove “W” clip at bottom
of spring. Place “W” clip in a higher hole in spring
rod for more pressure or in a lower hole for less
pressure, see Figure 16.
Opener Seeding Depth
A press wheel attached to each opener body con-
trols seeding depth. To maintain consistent depth,
the relationship between the bottom of the opener
disks and press wheel is fixed upwardly by an ad-
justable stop on each opener.
The press wheels also close the seed trench and
gently press soil over seed. To provide consistent
soil firming, press wheels are free to move down
from normal operating position. This maintains
pressing action even if opener disks encounter
obstructions or hard soil.
Set opener seeding depth by adjusting press-
wheel height. To adjust, first raise drill slightly,
then lift and slide T-handles on top of openers as
shown in Figure 17.
• For shallower seeding, slide T-handles to-
ward drill.
• For deeper seeding, slide T-handles away
from drill.
Minimum Pressure
Figure 16
Opener Down Pressure Adjustment
12102
Maximum Pressure 12103
Figure 17
Press Wheel Adjustment
15659
T-handle