GREAT PLAINS Yield-Pro YP4025A-48TR20, Operator'S Manual, Page: 83 / 190

YP4025A-48TR20 Table of Contents Index Adjustments 79
2019-03-19 Table of Contents Index 411-198M
Row Unit Down Pressure
Refer to Figure 75
The ideal amount of down-force causes the side gauge
wheels to compress any loose surface soil, but not press
a trench into subsoil.
To assess down-force, operate the implement name for a
short distance on typical ground (with or without
seeding), and stop. Leave the implement name lowered
(row units in ground).
At several row units, inspect the furrow created by the
opener discs, but prior to furrow closing by the press
wheels.
 Be sure to inspect rows both in and out of tire tracks.
Refer to Figure 76
1. If the side gauge wheels are leaving no tracks, or
light tracks, increase down-force.
2. If the wheels are compressing trash and loose soil,
and leaving clear tracks right at the top of the
subsoil, down-force is probably correct and needs no
adjustment.
3. If the wheels are creating a trench into the subsoil,
down-force is too high and needs to be reduced.
Adjusting Down-Force
The next two pages cover the standard mechanical
down-force system. If the optional Row-Pro™ system is
installed, down-force is set higher than required, and the
Row-Pro™ system automatically lowers it so that each
section runs at optimum down-force.“ Appendix R -
Row-Pro™ ” on page 172 for Row-Pro™ setup details.
Refer to Figure 77
Row unit springs provide the primary down pressure
necessary for row unit discs to open a seed trench. The
weight of the row units themselves contributes about
130 pounds (59 kg) of the total force.
The springs allow the row units to float down into
depressions and up over obstructions. Springs also
provide down force on coulters when using optional row
mounted coulters, and provide the primary down force on
row cleaners (optional), seed firmers (optional) and
press wheels.
With Frame-Mounted Coulters:
With frame-mounted coulters, the seed trench is
primarily opened by the coulters. Row unit springs
provide only additional assistance needed to make a
furrow “V” shaped and ensure furrow closure by the
press wheels.
Figure 75
Checking Furrow
36439
{
Inspect Furrow Here
Light or no side gauge
wheel tracks
Insufficient down-force
Increase down-force
Gauge wheels compress
loose soil only
Ideal
No adjustment required
Side gauge wheels
making deep tracks
Down-force too high
Reduce down-force
Figure 76
Assessing Down-force
1
2
3
Figure 77
25 Series Row Unit Springs
36439
1
1