Great Plains 1005NT Operator Manual - Manual (Page 14)

12
Section 3 Adjustments
705 and 1005 End-Wheel No-Till Drill 150-213M 4/12/05
Great Plains Mfg., Inc.
Section 3
Adjustments
Seeding Depth
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.
4. If necessary, adjust individual coulters or openers to
seed in tire tracks.
To correctly adjust seeding depth, you need a good under-
standing of how the coulters, openers and press wheels
work. The following is an introduction to how the no-till
coulter and double-disk openers are designed to control
seeding depth.
Coulters
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.
Coulter cutting depth is controlled by an adjustable
hydraulic depth stop on the master cylinder. Refer to
Coulter Depth, page 12 for information on this adjustment.
The amount of coulter down force 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
12 for more information on these adjustments.
Openers
Opener double disks widen the coulter groove to make a
seed bed. A seed tube mounted between the disks deliv-
ers seed to the trench. Mounted on the rear of each
opener is a press wheel. The press wheels control opener
depth and firm the seed into the soil.
To maintain a consistent depth, upward press wheel
movement is restricted by an independently adjustable
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 13 for information on these adjust-
ments.
To cut and widen the coulter groove and to firm the seed
into the soil, the openers have down-pressure springs.
Shortening or lengthening these springs changes opener
down force. Refer to Opener Down Pressure, page 14, for
information on how to make this adjustment.
When making opener adjustments, keep in mind that
openers will not run any deeper than coulters till the soil.
Coulter Depth
The master lift cylinder on your drill is equipped with a
hydraulic depth stop. See Figure 3-1. The amount of cylin-
der extension controls coulter depth. The stop is adjust-
able from zero to maximum cylinder stroke.
To set coulter depth:
1. Retract cylinder until coulters are at desired depth.
2. Loosen bolt (1) on depth-control plate (2). Slide plate
up cylinder rod until plate stops against control-valve
plunger (3) on head of cylinder.
3. Extend cylinder slightly and move depth-control plate
up to compensate for length of control-valve plunger.
Figure 3-1
Hydraulic Depth Stop for Coulters
NOTE: Do not lower coulters to aid in penetrating hard
soil. Instead, increase coulter down pressure by adding
weight to drill. Refer to Coulter Down Pressure, this page.
Coulter Down Pressure
Weights
If more weight is required for your soil conditions, add
weights to drill. Weight brackets are available from your
Great Plains dealer. Refer to Weight Brackets, page 33, for
ordering information. Add an equal amount of weight to
each end of drill.
705 Pounds Per Coulter
7 inch 7.5 inch 8 inch 10 inch
Empty Drill 330 350 350 404
Drill with Weight
Brackets
360 383 383 445
Drill with 200
pounds added
379 403 403 470
Drill with 600
pounds added
415 443 443 520
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