Great Plains 3PNG15 Operator Manual - Manual (Page 20)

16 3PNG12 and 3PNG15 Great Plains Manufacturing, Inc.
202-553M 10/06/2008
Seed Rates Overview
Details of seed rate setting are found in the Seed Rate
Manual.
Rate setting controls are different for each box. Some
boxes have more than one control.
Basic rate settings are found in the Seed Rate Manual
(part number 202-579B, normally located in the manual
pak enclosure at front center of drill).
All chart rates, for all boxes, are approximate. Great
Plains strongly recommends calibration of each box to
the material to be applied.
Seeding Depth Overview
Setting nominal planting depth, and achieving it consis-
tently, is affected by multiple adjustable drill functions,
which can interact. From greatest to least effect they are:
Refer to Figure 5
Opener Depth (Press Wheel Height) (page 28)
The T-handle sets the depth of the opener discs
below the ground surface (on which the press wheels
ride).
Row Unit Down Pressure (Springs) (page 27)
In most conditions, the factory spring setting is suffi-
cient to make a consistent furrow in conventionally
tilled soil. In extremely heavy conditions, the openers
may be making a furrow of inconsistent depth. You
can increase opener down force at the row unit
springs.
Disc Blade Adjustments (as blades wear) (page 26)
As blades wear, the diameter of the discs, and their
contact gap, changes. Seeding depth will also change
(or become irregular), unless adjustments are made
to blade spacing and the T-handle setting. Generally,
the blades need to be replaced completely before the
T-handle adjustment is exhausted.
Main
Box
Native
Grass
Small
Seeds
Coarse Rate
Drive Type
Sprockets
Drive Type
Sprockets
Note
a
a. The function of the sprocket set at the final Small
Seeds drive is to compensate for Drive Type
sprocket settings at drill front.
Fine Rate Rate Handle
Driver/Driven
Sprockets
Rate Handle
Cup
Adjustment
Door Handle
IMPORTANT !
Never back up with openers in the ground. To do so
may cause damage or opener plugging.
Figure 5
00 Series Row Unit
28482
1
2
3
1
2
3