Great Plains NTA3007 Operator Manual - Manual (Page 104)

100 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
Planting Depth Adjustments
Planting depth is affected by several adjustments,
summarized here:
Refer to Figure 99
1.
Soil Conditions:
Changes in field conditions can require changes to
several of the adjustments below.
2. Row Unit Opener Depth: (page 114)
The T-handle directly controls opener depth by
setting the press wheel height.
3. Wing Weight Transfer: (not shown, page 107)
If the wings are not operating at desired planting
depth, more centre section weight may need to be
transferred to wings.
4. Row Unit Spring Adjustment: (page 111)
Several rows (in tire tracks) may need to be set to
higher down-force in challenging conditions.
5. Opener Wear: (page 111)
Over time, opener disc wear can cause established
T-handle settings to become too shallow.
6. Coulter Depth: (Option, page 108)
Optional Coulters prepare the furrow ahead of the
openers. Their depth, relative to the openers, is
adjusted only by the opener depth. If their discs are
too worn, they may run shallow ahead of the
openers, and the openers may not operate at the
desired depth.
7. Opener Sub-Frame: (page 106)
Spacer plates at the parallel arms adjust row unit
levelling, to keep openers parallel to the ground at
higher down-forces.
Figure 99
Depth Control Elements
29419
1
2
6 5
4 7