Great Plains 3N-4025P Operator Manual - Manual (Page 81)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 77
2014-01-29 Table of Contents Index 196-538M
7. Measure the depth at which the coulters are running.
Measure only in non-tire-track rows where the
coulter springs are not in compression (arm is at full
extension). If the coulters are at the desired depth,
no further adjustment is necessary. Skip to step 11.
8. Raise the drill and set the lift circuit to neutral.
9. Adjust the stop up (to raise depth) or down (to lower
depth). Adjust in small increments. Secure the stop
with the knob on the bolt
.
10. Check the new setting starting at step 5.
11. Raise and lower several times and confirm that the
drill stops consistently at the new height.
Before making any adjustments to individual
frame-mounted coulters, setup the seeding depth on the
row units, and verify that the coulter tool bar height is set
for your conditions.
Individual Frame-Mounted Coulter Depth
The running depth of all coulters is adjusted
simultaneously by changing the tool bar height. Adjusting
the height of a small number of coulters may be useful
for rows in tire tracks.
Adjust individual coulters as follows.
1. On level ground, lower the drill until coulters just
touch the ground.
2. Raise the drill by the extra amount you need to lower
the rows in tracks.
Refer to Figure 95
3.
At each frame-mounted coulter to be adjusted,
slightly loosen all six bolts (
, ) at the mount.
4. Using a rubber mallet, tap the spring bar up or
down until the bottom edge of the coulter disk is at
ground level.
5. Tighten the two clamp bolts until both U-bolts are
firmly against the edge of the spring bar . It is
normal for there to be a small gap between the
clamps.
6. Tighten the four U-bolts .
7. Lower the drill to planting height and pull forward
30 feet (10 m).
8. Check coulter blade to opener blade (furrow
centerline) alignment.
Note: It is important that all of the tires remain in contact
with the ground to maintain levelness of machine
from front to rear. Setting the depth control too
deep combined with high opener spring force can
cause the drill to tip forward when planting, which
may cause plugging.
Running with the front tires floating or skimming on
the ground will cause uneven coulter depth and
may cause uneven seed depth.
2
Note: A gap of as much as
1 ⁄
8
in (3 mm) between the
clamp plates is normal.
Figure 95
Frame-Mounted Coulter Height
10300
1
2
3
1 2
3
1
3
2