Great Plains 3N-4020 Operator Manual - Manual (Page 90)

86 3N-4010F/3N-4010HDF/3N-4020F Table of Contents Index Great Plains Manufacturing, Inc.
196-359M Table of Contents Index 2013-10-29
20 Series Disk Adjustments
See also “20 Series Opener Maintenance” on page
112.
Opener Disc Contact Region
Refer to Figure 130
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 1.75in (13
to 44mm) 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 mov-
ing one or more spacer washers.
Adjusting Disc Contact
Refer to Figure 130 and Figure 131
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 132
The side gauge wheels have two, interrelated adjust-
ments:
• angle of side gauge wheel, and
• distance between side gauge wheels and disks.
Refer to Figure 133
Adjust side-gauge-wheel angle so wheels contact
row-unit disks at the bottom of wheel at 2in planting
depth and gaps open
3 ⁄
8
to 5 ⁄
8
in 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 130
Opener Disc Contact Region
26127
1
2
1
Figure 131
Opener Disc Spacers
26128
6
5
3
4
2
3 4
5 6
5
6
Incorrect Correct
Figure 132: 20 Series:
Disk/Gauge Wheel Alignment
Side Gauge
Wheel
Opener
Disks
Side Gauge
Wheel