Row unit down pressure, Adjusting down-force – Great Plains YP825A3P Operator Manual User Manual
Great Plains Manufacturing, Inc.
Row Unit Down Pressure
Refer to Figure 39
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 planter for a short
distance on typical ground (with or without seeding), and
stop. Leave the planter 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
Note: Be sure to inspect rows both in and out of tire
Refer to Figure 40
If the side gauge wheels are leaving no tracks, or
light tracks, increase down-force.
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
If the wheels are creating a trench into the subsoil,
down-force is too high and needs to be reduced.
Refer to Figure 41
Row unit springs
provide the primary down pressure
necessary for row unit disks 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
Inspect Furrow Here
Light or no side gauge
Gauge wheels compress
loose soil only
No adjustment required
Side gauge wheels
making deep tracks
Down-force too high
25AP Series Row Unit Springs