Great Plains 3N-4020 Operator Manual - Manual (Page 78)

74 3N-4010F/3N-4010HDF/3N-4020F Table of Contents Index Great Plains Manufacturing, Inc.
196-359M Table of Contents Index 2013-10-29
10 Series Seed-Lok™ Lock-Up
Optional Seed-Lok firming wheels provide additional
seed-to-soil contact. The wheels are spring loaded and
do not require adjusting. In some wet and sticky condi-
tions the wheels may accumulate soil. To avoid problems
associated with this, you can lock-up the firmers.
Refer to Figure 109 (which depicts a row unit with the opener
blades removed for clarity)
To lock up Seed-Lock wheels:
1. Hook one end of chain in opener-body hole just
above wheel arm
.
2. Pull firming-wheel arm up as high as possible and
wrap chain around arm .
3. Hook other end of chain in a link. Leave no slack in
chain; secure wheel arm in its highest position.
10 Series Opener Depth
(Press Wheel Height)
Seeding depth on 3N-4010F, 3N-4010HDF and
3N-4020F is set by coulter depth and row unit depth. Set
coulter depth before making row unit depth adjustments.
10 Series press wheel height is a stop adjustment and
not a spring adjustment. It establishes a fixed relation-
ship between opener depth and closed-furrow surface at
the press wheel
Refer to Figure 110
Set opener seeding depth by adjusting press-wheel
height
. To adjust, first raise openers slightly, then lift
and slide T handles on top of openers Adjust all press
wheels to the same height.
• For more shallow seeding, slide T handles forward
toward implement.
• For deeper seeding, slide T handles backward
away from implement.
If press wheels are lifting off ground, check front-to-back
level, and increase row unit spring down force.
If press wheels are digging into ground, reduce spring
down force at the row units.
Figure 109: 10 Series:
Seed-Lok™ Lock-Up
16856
3
2
1
1
2
3
Figure 110: 10 Series:
Initial Opener Depth
12100
1
2 B
F
1
2
F
B