Great Plains 3N4010HDA Operator Manual - Manual (Page 43)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 39
2013-09-24 Table of Contents Index 196-444M
Refer to Figure 35
The lift system includes an adjustable stop valve
to fix
the height of the opener frame when the drill is lowered.
Make sure the drill is level and the lift system bled and
re-phased before adjusting the tool bar height.
To adjust the stop height:
1. Move to smooth level ground representative of field
conditions.
2. Lower the drill and measure the present tool bar
height. If the drill cannot be fully lowered due to row
unit spring settings, temporarily move the cams to a
lower setting, or out of notch entirely.
3. Raise the drill.
4. Loosen the knob on the stop .
5. Adjust the stop position on the tube . Adjust up
(to raise) or down (to lower). Adjust by half the last
difference. Secure the stop with the knob bolt
.
6. Lower the drill and measure the tool bar height. If the
error is more than about
1 ⁄
8
in (3mm), repeat the
adjustment process from step 3.
7. Raise and lower several times and confirm that the
drill stops consistently at the new height.
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.
Figure 35
UMC/NC Opener Depth Stop
20274
2
3
1
4
5
1
2 3
3 4
2