Great Plains NTA1300 Operator Manual - Manual (Page 22)

20 NTA 1000 and NTA 1300 148-528M 5/26/2006
Great Plains Mfg., Inc. Adjustments
Seeding Depth
To set drill seeding depth, you must:
• Set coulter depth with tongue cylinder and guage
wheels.
• Set opener depth with T-handles on press wheel.
• If field conditions make it necessary, increase coulter
down pressure by adding tractor weights to frame.
• 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 tilled path in the soil for the openers.
Coulter cutting depth is controlled by the tongue cylinder
and the guage wheels. You also can change the depth of
individual coulters by changing coulter-mounting height.
Refer to Coulter Depth, page 21, 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
21, for more information on these adjustments.
Openers
Opener double disks travel in the coulter path to make a
seed bed. Mounted on the rear of each opener is a press
wheel. The press wheels control opener seeding depth
and firms 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 22, 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 23, for information on how
to make these adjustments.
Adjustments