Great Plains 3P600 Operator Manual - Manual (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 21
2011-10-21 Table of Contents Index
Opener Springs
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.
If coulter depth is altered for a row, the spring
pre-compression needs to be changed to compensate
for the change in row unit operating height.
Refer to Figure 11 and Figure 12
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.
Do not set row force higher on all rows. Use this
adjustment only for a few rows, typically in tire tracks.
Re-check drill level (page 12) after adjusting row force.
Figure 11
Minimum Force
12102
“W”
Figure 12
Maximum Force
12103
“W”