Great Plains YP3025 Operator Manual - Manual (Page 68)

64 YP3010HDP/3020P/3025 Table of Contents Index Great Plains Manufacturing, Inc.
401-703M Table of Contents Index 2013-09-09
20P Series Down-Pressure
Refer to Figure 69
An adjuster cam sets row unit spring down pressure
individually for each row unit. This is useful for penetrat-
ing hard soil and planting in tire tracks.
To adjust down pressure, use a tool to lift and rotate the
adjustment cam.
1. Raise the planter. Although this adjustment can be
made with the planter lowered, the springs will be in
tension, and will require more effort. The extra force
required may also damage tools.
2. Put tractor in Park and shut it off.
3. Position tool under upper spring link, and pull it back
and up.
4. Move the adjustment cam to the new setting on the
spring adjust bar
.
Note: Do not set all rows higher than notch 2. Using high
settings across all rows causes uneven planting.
Individual rows may be set higher in tire tracks.
Refer to Figure 70 and Figure 71
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 dis-
tance 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
wheels.
Note: Be sure to inspect rows both in and out of tire
tracks.
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 sub-
soil, 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.
Figure 69: 20 Series:
Row Unit Minimum & Maximum
12104
b
3
2
2
1
b
Cam Notch Pounds Kilograms
zero (out of notch) Maintenance Only
one 100 45
two 165 75
three 225 100
tip Do Not Use
31453
Figure 70: 20 Series:
Checking Furrow
27387
{
Inspect Furrow Here
b
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 71: 20 Series:
Assessing Down-force
1
2
3