Adjusting 10 series down-force, 10 series disk blade adjustments – Great Plains 3N-4020 Operator Manual User Manual
Page 76
72
3N-4010F/3N-4010HDF/3N-4020F
Great Plains Manufacturing, Inc.
196-359M
2013-10-29
Adjusting 10 Series Down-Force
Refer to Figure 104
An adjuster cam sets row unit spring down pressure indi-
vidually for each row unit. This is useful for penetrating
hard soil and planting in tire tracks.
Refer to Figure 105
To adjust down pressure, use the spring adjustment tool
(part 198-126H) stored behind the tool bar at the
Slow-Moving-Vehicle placard.
1.
Raise the drill. Although this adjustment can be
made with the drill lowered, the springs will be in ten-
sion, 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 in the holes.
4.
Pull upper spring link back.
5.
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 plant-
ing. Individual rows may be set higher if running in
tire tracks.
10 Series Disk Blade Adjustments
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.
Refer to Figure 106
The ideal spacing causes the blades to be in contact for
about one inch. If you insert two pieces of paper between
the blades, the gap between them should be 0.5 to
1.75in (13 to 44mm).
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. If the contact region
varies with blade rotation, one or both blades is likely
bent and in need of replacement.
Cam Notch
Pounds
zero (out of notch)
Maintenance Only
one
100 lbs (445 N)
two
116 lbs (516 N)
three
140 lbs (623 N)
tip
Do Not Use
Figure 104: 10 Series:
Row Unit Minimum & Maximum
12104
Figure 105: 10 Series:
Adjusting 10 Series Springs
12105
Figure 106: 10 Series:
Checking Disk Contact
26447