Great Plains 3N4010HDA Operator Manual User Manual
Page 39
Great Plains Manufacturing, Inc.
Adjustments
35
2013-09-24
196-444M
Crushing Hazard: Make all down-stop adjustments with
circuit in neutral and drill raised (actuator plunger not in
contact with down-stop). Loosening the down-stop with circuit
active and drill lowered results in rapid lowering of the frame.
Make sure the drill is level and the lift system bled and
re-phased before adjusting the tool bar height. If the center
section does not consistently stop at the set height, or the
wings do not run at the same height as the center, the lift
system may have air or be out of phase (above), or the wings
may not be level. See “Leveling Drill” on page 56.
Adjusting the coulter height may be done with or without
the air cart hitched.
Refer to Figure 31
Note: The change in coulter height is greater than the
change in down-stop adjustment. Make adjust-
ments in small amounts.
The lift system includes an adjustable stop valve
to fix
the height of the opener frame when the drill is lowered.
To adjust the stop height
(assuming a desired 1
1
⁄
4
in / 3.2cm coulter depth):
1.
Move to smooth level ground with soil as similar as
possible to field conditions.
2.
Lower the drill until the coulter blades just touch the
ground. Hold that height by setting the lift circuit to
neutral.
3.
Loosen the knob
on the stop
.
4.
Adjust the stop
position on the tube
until it just
touches the actuator
.
5.
Raise and then fully lower the drill.
6.
Pull forward 10 feet (3m) and stop.
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.
Figure 31
FMC Opener Depth Stop
20274
2
3
1
4
5
1
2
3
3
4
5
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