Great Plains 3N-4020 Operator Manual - Manual (Page 63)

2013-10-29 Table of Contents Index 196-359M
Great Plains Manufacturing, Inc. Table of Contents Index 59
Adjustments
To get full performance from your drill, you need an
understanding of all component operations, and many
provide adjustments for optimal field results.
The 3N-4010F, 3N-4010HDF and 3N-4020F have dou-
ble-disk parallel-arm openers with depth-controlling
press wheels. This system provides accurate depth con-
trol and seed placement over uneven terrain. The follow-
ing is an introduction to the basic seeding components
and how they work.
Each opener is mounted on a floating opener frame, held
parallel to the ground. Opener bodies are staggered for
easy soil flow. A spring provides the down pressure nec-
essary for opener double disks to open a seed furrow.
The spring allows openers to float down into depressions
and up over obstructions. Trailing press wheels close the
furrow. Individual 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 drill functions,
from greatest to least effect they are:
• Coulter Height;
• Opener Depth (Press Wheel and/or Side Wheel)
• Row Unit Down Pressure;
• Frame Weight;
• Disk Blade Adjustments (as blades wear).
Adjustment Page The Adjustment Affects
Level Frame Side to Side 102 Center-vs-wing planting consistency
Level Frame Front to Rear 102 Correct seeding depth and furrow coverage
Implement Lift Switch Adjustment 67 Avoiding wasted and unplanted seed
Coulter Frame Height 63 Seeding depth
Individual Frame-Mounted Coulter Depth 65 Compensating for tire tracks
Frame Weight 68 Compensating for unusually light or heavy conditions
Frame Weight 68 Achieving higher down-force settings
Marker Extension 18 Pass alignment
Marker Adjustments 69 Mark visibility
Row Unit Adjustments Series: 10 10HD 20
Overview 70 75 84
Unit-Mount Coulter Adjustments - 76 - Furrow preparation and seeding depth
Row Unit Down Pressure 71 78 85 Consistent seeding depth in tire tracks
Opener Disk Blade Adjustments 72 80 86 Consistent seeding depth
Depth Gauge Wheel Adjustments - - 86 Seeding depth
Seed Firmer Adjustments 73 81 88 Consistent seed placement and coverage
Press Wheel Height 74 82 89 Seeding depth (10/10HD), furrow closure (all)