Coulter adjustments, Coulter depth (all rows) – Great Plains 3P806NT Operator Manual User Manual
Page 36
32
3P806NT
Great Plains Manufacturing, Inc.
151-143M
2011-12-20
Coulter Adjustments
Refer to Figure 21
A no-till coulter
, is mounted directly ahead of each
opener on the drill. The coulters cut through heavy trash
and make a groove in the soil for the openers. The
coulters are mounted on the drill frame so coulter cutting
depth changes as the drill is raised and lowered.
To set drill seeding depth, you must:
1.
Set coulter depth by raising or lowering the front
drive wheel (see below).
2.
Check front-to-back drill level and re-adjust lift-assist
stroke control spacers (page 17).
3.
Set opener depth with T-handles
on press wheels
(page 39).
4.
If soil conditions make it necessary, increase coulter
down pressure by adding weights (page 34).
Coulters normally operate fully down against their stops,
with the coulter springs compressing only occasionally
as the blades encounter obstructions.
If necessary, adjust individual coulters or openers to run
deeper for tire tracks, refer to “Coulter Depth
(Individual Rows)” on page 34.
The amount of coulter down force needed to cut a soil
groove varies with soil conditions. Adding weight or
shortening the coulter spring increases coulter down
pressure and cutting force.
Coulter Depth (All Rows)
Refer to Figure 22
Raise or lower drive wheel, by relocating axle, to achieve
proper coulter depth.
• Raising wheel sets coulters deeper.
• Lowering wheel sets coulters shallower.
Note: Factory default setting is hole
.
Note: Do not lower coulters to aid in penetrating hard soil.
Instead, increase coulter down pressure by adding
weight to drill. See “Coulter Down Pressure” on
page 33.
Normal practice is to set coulter depth approximately 1 inch
deeper than desired seed depth.
Figure 21
Coulter
18645
2
1
1
2
Figure 22
Coulter Depth Adjustment
18509
a
b
c
d
e
f
h
g
Coulter Depth
Hole
inches
mm
a
3
1
⁄
2
89
b
2
7
⁄
8
73
c
2
3
⁄
8
60
d
1
7
⁄
8
48
e
1
3
⁄
8
35
f
7
⁄
8
22
g
3
⁄
8
95
h
1
⁄
4
64
d