Great Plains 3N-4025P Operator Manual - Manual (Page 75)

2014-01-29 Table of Contents Index 196-538M
Great Plains Manufacturing, Inc. Table of Contents Index 71
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-4010P, 3N-4010HDP, 3N-4020P and 3N-4025P
have double-disk parallel-arm openers with
depth-controlling press wheels. This system provides
accurate depth control and seed placement over uneven
terrain. The following 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
necessary 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
consistently, 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 142 Center-vs-wing planting consistency
Level Frame Front to Rear 143 Correct seeding depth and furrow coverage
Implement Lift Switch Adjustment 91 Avoiding wasted and unplanted seed
Coulter Frame Height 75 Seeding depth
Individual Frame-Mounted Coulter Depth 77 Compensating for tire tracks
Frame Weight 93 Compensating for unusually light or heavy conditions
Frame Weight 93 Achieving higher down-force settings
Seeding Rate 38 Seeds per area or weight per area
Row Unit Adjustments Series: 10 10HD 20 25
Overview 95 100 109 115
Unit-Mount Coulter Adjustments - 101 - Furrow preparation and seeding depth
Row Unit Down Pressure 96 103 110 116 Consistent seeding depth in tire tracks
Opener Disk Blade Adjustments 97 105 111 119 Consistent seeding depth
Depth Gauge Wheel Adjustments - - 111 120 Seeding depth
Seed Firmer Adjustments 98 106 113 121 Consistent seed placement and coverage
Press Wheel Height 99 107 114 122 Seeding depth (10/10HD), furrow closure (all)