Great Plains 3N-4025P Operator Manual - Manual (Page 115)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 111
2014-01-29 Table of Contents Index 196-538M
20P Series Disk Blade Adjustments
See also “20 Series Opener Maintenance” on
page 152.
Opener Disc Contact Region
Refer to Figure 153
Opener disc angle and stagger is not adjustable, but
disc-to-disc spacing is, and may need attention as discs
experience normal wear. Spacers will need to be reset
when blades are replaced.
The ideal spacing causes the blades to be in contact for
about one inch
. If you insert two pieces of paper
between the blades, they should slide to
0.5 to 1.75 inches (13 to 44 mm) of each other.
If the contact region is significantly larger or smaller (or
there is no contact at all), it needs to be adjusted by
moving one or more spacer washers.
Adjusting Disc Contact
Refer to Figure 153 and Figure 154
1.
Raise the drill.
2. Remove the side gauge wheels on the row unit in
need of adjustment.
3. Remove the bolt retaining the opener disc on
one side. Carefully remove the disc. Do not lose the
hub components and spacer washers
, .
4. To reduce the spacing between the discs (the normal
case), move one spacer washer from the inside
to
the outside of the disc.
5. Re-assemble and check disc contact.
Side Gauge Wheel Adjustments
Refer to Figure 155
The side gauge wheels have two, interrelated
adjustments:
• angle of side gauge wheel, and
• distance between side gauge wheels and disks.
Refer to Figure 156
Adjust side-gauge-wheel angle so wheels contact
row-unit disks at the bottom of wheel at 2 inch planting
depth and gaps open
3 ⁄
8
to
5 ⁄
8
inch at top. Check with
row-units in soil so wheels are held up.
At the same time, keep side gauge wheels close to
opener disks so openers do not plug with soil or trash.
However, wheels should be out far enough so disks and
wheels turn freely.
Figure 153
Opener Disc Contact Region
26127
1
2
1
Figure 154
Opener Disc Spacers
26128
6
5
3
4
2
3 4
5 6
5
6
Figure 155: 20 Series:
Disk/Gauge Wheel Alignment
Incorrect Correct
Side Gauge
Wheel
Opener
Disks
Side Gauge
Wheel