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196-366m Table of Contents Index Adjustments
Great Plains | | 4/22/19 Table of Contents Index 33
Adjustments
No-Till Seeding
To get full performance from your no-till drill, you need a
good understanding of coulter, opener and press wheel
operation.
Coulters
A no-till coulter is mounted directly ahead of each
opener. The coulters cut through heavy trash and till a
small strip so the openers can penetrate the soil easily.
To maintain even seeding depth, the coulters must cut
below the openers.
The coulters are mounted directly on the box frame.
Consequently, the cutting depth of all coulters changes
as the drill is lifted and lowered.
The cutting depth of the coulters is controlled by an
adjustable hydraulic depth stop. Coulters that run directly
in tire tracks can be lowered individually. Refer to
“Coulter Adjustments,” page xxxiv, for information on
how to make these adjustments.
Openers
Each opener is mounted on the drill with parallel arms.
This parallel-action mounting allows the opener to move
up and down while staying in-line with a coulter. Opener
double disks widen the coulter groove, making a seed
bed. A seed tube mounted between the disks delivers
seed to the trench.The down force needed to cut and
widen the coulter groove is supplied by two springs
nested in the parallel linkage. Adjusting these springs
changes opener down-force. Refer to “Opener Down
Pressure,” page xxxvi, for information on how to make
this adjustment.
Press Wheels
Attached to the rear of each opener is one of several
press-wheel options. The press wheels provide two
important functions.
First, the press wheels close the furrow, gently pressing
the soil over the seed. To provide consistent seed
firming, the press wheels are free to move downward
from their normal operating position. This system
maintains pressing action even if the opener arm is lifted
when the disks encounter obstructions.
Second, the press wheels provide opener depth control.
The higher the press wheels run relative to the double
disks, the deeper seed will be placed. To maintain a
consistent depth, upward press-wheel movement is
restricted by an independently adjustable stop on each
opener. Refer to “Opener Seeding Depth,” page xxxvii,
for information on how to make this adjustment.