Great Plains 1205NT Operator Manual - Manual (Page 27)

3/28/12 150-131M
25 Adjustments
Adjustments
Coulter Adjustments
A no-till coulter (1), Figure 13, 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 with hydraulic stop.
2. Set opener depth with T-handles on press
wheels.
3. If soil conditions make it necessary, increase
coulter down pressure by adding weights.
If necessary, adjust individual coulters or openers
to seed in tire tracks, refer to page 26.
Coulter cutting depth is controlled by a depth con-
trol valve.
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 Control
The master-slave lift cylinders on your drill control
the depth of the coulters. A depth valve regulates
the retracted length of these cylinders.
1. See Figure 14. Slightly raise drill with depth
stop engagement arm on the rock shaft not
touching the valve.
2. Turn the depth control knob clockwise. Each
rotation lowers the coulters approximately 1/4
inch.
3. Raise and lower drill a few times to recheck
depth.
NOTE: Changing depth of coulters will effect
planting depth of openers. Press wheels will need
to be adjusted accordingly.
Figure 13
Coulter
13985
Figure 14
Coulter Depth Stop
15522