Great Plains 3PNG15 Operator Manual - Manual (Page 25)

10/06/2008 202-553M
Great Plains Manufacturing, Inc. Adjustments 21
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 3PNG12 and 3PNG15 has double-disc 00 Series
openers with depth-controlling press wheels mounted on
floating opener frames. Opener bodies are staggered for
easy soil flow. All openers pivot on a common axis to
maintain consistent depth as the opener frame follows
contours. Springs provide the down pressure necessary
for double discs to open a seed furrow. The spring allows
openers to float into depressions and over obstructions.
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.
Seed Rate
Seeds are applied by fluted feed meters driven by the
ground wheels. Independent mechanisms drive main
seed, native grass and small seeds application.
Main Box Seed rate is controlled by adjustments for:
• Drive Type sprockets
• Seed Rate Handle at box (drill front)
• Feed Cup Door (one each seed tube)
Native Grass rate is controlled by:
• Drive Type sprockets
• Driving/Driven sprockets at Native Grass Seed box
Small Seeds rate is controlled by:
• Final Drive sprocket to match Drive Type
• Rate Handle at box (drill rear)
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:
• Correct Opener Frame Height,
• Opener Depth (Press Wheel Height),
• Opener Down Pressure, and;
• Disc Blade Adjustments (as blades wear).
Adjustment Page The Adjustment Affects
Leveling the Drill
Opener Frame Height (Front) 24 Correct opener height
Side-to-Side Level 24 Consistent planting across drill
Front-to-Back Level 24 Opener down-pressure and range
Marker Setup
Marker Extension 45 Pass-to-pass alignment
Marker Disk angle/orientation 23 Mark visibility
Setting Main Box Seed Rate R
Setting Native Grass Rate R
Small Seeds Rate R Small seeds population
Row Unit Adjustments 25
Disc Blade Adjustments 26 Consistent seeding depth
Opener Down Pressure 27 Level row units and consistent seeding depth in tire tracks
Disc Scraper Adjustment 27 Consistent seeding depth
Seed Firmer Adjustments 28 Consistent seed placement and coverage
Opener Depth (Press Wheel Height) 28 Seeding depth.
R Rate setting details are in the Seed Rate Manual (see page 9 for part number), normally located in the Manual Pak enclosure
at the front of the drill.