Great Plains 3N-4025P Operator Manual - Manual (Page 114)

110 3N-40P Table of Contents Index Great Plains Manufacturing, Inc.
196-538M Table of Contents Index 2014-01-29
20P Series Row-Unit Down Pressure
Refer to Figure 150
An adjuster cam sets row unit spring down pressure
individually for each row unit. This is useful for
penetrating hard soil and planting in tire tracks.
To adjust down pressure, use a tool to lift and rotate the
adjustment cam.
1. Raise the drill. Although this adjustment can be
made with the drill 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 two. Using
high settings across all rows causes uneven
planting. Individual rows may be set higher if
running in tire tracks.
20P Series Row-Unit Planting Depth
Refer to Figure 152
Side depth wheels
outside the row-unit disks
control row-unit planting depth. The position of an
adjustable stop, using the T-handle
, determines
planting depth.
Set planting depth by adjusting handle . To adjust, first
raise row-units slightly, then lift and slide handle on top of
row-units. Adjust all handles to the same setting.
For shallower planting, slide handle forward toward
planter.
For deeper planting, slide handle back away from
planter.
Cam Notch Pounds
zero (out of notch) Maintenance Only
one 100
two 165
three 225
tip Do Not Use
Figure 150: 20P Series:
Row Unit Minimum & Maximum
12104
8
3
2
2
1
8
1
2
3
Light or no press wheel
tracks Insufficient down-force
Increase down-force
Press wheel(s) compress
loose soil only Ideal
No adjustment required
Press wheel(s)
making deep tracks Down-force too high
Reduce down-force
Figure 151: 20 Series:
Assessing Down-force
1
2
3
8
Figure 152: 20P Series:
Side Depth Gauge Wheels
27387
1
2
3 1 2
3
3