Great Plains CTA4000 Operator Manual - Manual (Page 37)

Adjustments 33
08/03/2010 160-269M-A
Adjustments
To get full performance from your implement, you need
an understanding of all component operations, and many
provide adjustments for optimal field results.
The CTA4000 has double-disk openers with depth-con-
trolling press wheels mounted on floating opener frames.
This system provides accurate depth control and seed
placement over uneven terrain. The following is an intro-
duction to the basic seeding components and how they
work.
Each opener is mounted on a floating opener frame.
Opener bodies are staggered for easy soil flow. All open-
ers pivot on a common axis to maintain consistent depth
as the opener frames follow contours. A spring provides
the down pressure necessary for opener double disks to
open a seed furrow. The spring allows openers to float
down into depressions and up over obstructions. Individ-
ual openers can be adjusted to account for tire tracks.
Even if your planting conditions rarely change, some of
these adjustment items need periodic attention due to
normal wear.
Planting Depth
Setting nominal planting depth, and achieving it consis-
tently, is affected by multiple adjustable implement func-
tions, from greatest to least effect they are:
• Opener Depth (Press Wheel Height),
• Sub-Frame Down-Force,
• Row Unit Down Pressure (Spring),
• Opener Height,
• Opener-Subframe Adjustment,
• Frame Weight (at higher pressures), and;
• Disk Blade Adjustments (as blades wear).
Adjustment Page The Adjustment Affects
Frame Level 34 Section-to-section planting consistency
Implement Lift Switch Adjustment 34 Avoiding wasted and unplanted seed
Sub-Frame Down-Force 37 Consistent seeding depth
Opener-Subframe Adjustment 39 Level row unit running in desired pressure range
Frame Weight 35 Achieving higher down-force settings
Adjusting Weight Transfer 36 Equal seeding depth under wings and center section
Row Unit Adjustments 40
Opener Height 41 Seeding depth in tire tracks
Row Unit Down Pressure (Spring) 41 Level row unit; consistent seeding depth in tire tracks
Disk Blade Adjustments 42 Consistent seeding depth
Disk Scraper Adjustments 42 Consistent furrow
Seed Firmer Adjustments 43 Consistent seed placement and coverage
Opener Depth (Press Wheel Height) 44 Seeding depth
Fan Speed
29
*
* See air cart operator’s manual for complete fan information.
Consistent seed population and minimum seed damage