Great Plains CP1000 Operator Manual - Manual (Page 19)

17
Section 3 Adjustments
7/5/2005 CP1000 Three-Meter Drill and Hitch 148-358M
Great Plains Mfg., Inc.
Section 3
Adjustments
Seeding Depth
To set drill seeding depth, you must:
• Set coulter depth with tongue cylinder.
• Set opener depth with T-handles on press wheel.
• If field conditions make it necessary, increase coulter
down pressure by adding weights.
• If necessary, adjust individual coulters or openers to
seed in tire tracks.
The following is an introduction to how the coulters and
double-disk openers are designed to control seeding
depth.
Coulters
A no-till coulter is mounted on the hitch directly ahead of
each opener on the drill. The coulters cut through heavy
trash and make a groove in the soil for the openers.
Coulter cutting depth is controlled by the tongue cylinder.
You also can change the depth of individual coulters by
changing coulter-mounting height. Refer to Coulter Depth,
page 17, for information on these adjustments.
The amount of coulter down pressure needed to cut a soil
groove varies with soil conditions. Adding weight or short-
ening the coulter spring increases coulter down pressure
and cutting force. Refer to Coulter Down Pressure, page
18, for more information on these adjustments.
Openers
Opener double disks widen the coulter groove to make a
seed bed. Mounted on the rear of each opener is a press
wheel. The press wheels control opener seeding depth
and firm the seed into the soil.
To maintain a consistent seeding depth, upward press
wheel movement is restricted by an independently adjust-
able stop on each opener. Moving this stop changes the
depth at which seed is placed. The mounting height of
openers that run in tire tracks also can be changed. Refer
to Opener Depth, page 19 for information on these adjust-
ments.
The amount of opener down pressure needed to cut and
widen the coulter groove and to firm the seed into the soil
varies with soil conditions. Opener down pressure can be
adjusted for all openers or individual openers. Refer to
Opener Down Pressure, page 19, for information on how
to make these adjustments.
Coulter Depth
Adjust coulters to run 13 to 25 mm (1/2 to 1 inches) below
the drill openers. Coulter depth can be adjusted hydrauli-
cally for all coulters or manually for individual coulters.
Hydraulic Control
Make the following adjustment when drilling in level
ground with the seed box half full.
1. Retract tongue cylinder to transfer weight to coulter
toolbar.
2. Set tongue cylinder so coulters are at desired depth.
Note setting on cylinder gauge (see Figure 3-1) so you
can return to the same depth.
NOTE: Use cylinder gauge only as a reference. Gauge
does not measure actual coulter depth.
Figure 3-1
Cylinder Gauge
3. With coulters and drill lowered to desired seeding
depth, check that hitch frame (1) runs parallel with
ground as shown in Figure 3-2.
Figure 3-2
Levelling Implement
17218
17226