Great Plains 3PNG15 Operator Manual - Manual (Page 31)

Great Plains Manufacturing, Inc. Adjustments 27
10/06/2008 202-553M
Opener Adjustments
Opener Down Pressure
Opener springs provide the down pressure necessary for
opener discs to open a seed trench. The springs allow
the openers to float down into depressions and up over
obstructions.
Each opener spring can be adjusted for down pressure.
This is useful when planting in tractor tire tracks.
Refer to Figure 19
To adjust the pressure, remove “W” clip at bottom of
spring. Place “W” clip in a higher hole in spring rod for
more pressure or in a lower hole for less pressure.
IMPORTANT !
Use this adjustment only for a few rows, typically in tire
tracks.
Re-check drill level front-to-back (page 24) after adjust-
ing row force.
Disc Scraper Adjustment
To keep opener discs turning freely, dirt scrapers are
mounted between discs to clean as the discs rotate. As
field conditions vary, scrapers may need to be adjusted.
In damp conditions, scrapers may need to be lowered. If
openers are not turning freely, scrapers may need to be
raised.
Refer to Figure 20
To adjust scrapers, loosen
3 /
8
inch bolt shown in and
move scraper as needed.
The standard scraper is shown. Optional spring-loaded
carbide scrapers are available (see page 40). They
require no adjustment.
“W” Clip Hole
Row Down Force Added
Pounds kg
Highest +60 +27
Middle +30 +14
Lowest Factory Setting
Maximum Pressure 12103
Minimum Pressure 12102
“W”
“W”
Figure 19
Opener Down Pressure Adjustment
Figure 20
Disc Scraper Adjustment
18647
1
1