GREAT PLAINS 3P1006NT Guide
FIELDADJUSTMENTGUIDE
Document #DRUS100C-0003A
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Document # DRUS100C-0003A
Drills
3-Point Eight & Ten Foot No-Till Drills
Proper servicing and adjustment is key to the long life of all farm equipment. With careful and systematic
inspection of equipment, costly maintenance, time and repair can be avoided. The following information
will assist with recommended servicing and adjustments:
48873
Models Affected:3P806NT, 3P1006NT
Date: August 4, 2015
General Information
Document #DRUS100C-0003A 2 of 4
Adjusting Coulter Height:
Raising the gauge wheel spindle provides deeper
coulter depth while lowering the gauge wheel provides
shallower depth. Note: Do not lower the coulters to aid
in penetrating hard soil. Instead, increase coulter
down-force or add optional weight to the drill.
1) Determine the desired coulter depth. With new
coulter blades, the axle holes provide the following
depths:
2) Raise the drill until the spindle can be adjusted any
distance.
3) Loosen the chain idlers.
4) Remove the wheel bolts and move the spindle to the
desired hole. Re-install the wheel bolts.
5) Re-engage the chains idlers and check the overall
depth.
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2
3
4
5
6
7
8
Hole No.
(from top)
Coulter Depth
Inches mm
1 3 1/2 in. 89 mm
2 2 7/8 in. 73 mm
3 2 3/8 in. 60 mm
4 1 7/8 in. 48 mm
5 1 3/8 in. 35 mm
6 7/8 in. 22 mm
7 3/8 in. 10 mm
8 1/4 in. 6 mm
Individual Coulter Height Adjustment:
Individual coulter depth may be adjusted by raising and
lowering the spring bar.
1) Determine the new desired coulter depth, and/or the
difference between that and the current depth.
2) Raise the drill until the coulters are just touching the
ground. The press wheels are supporting some weight
at this point.
3) Measure the current spring bar length, from the bot-
tom of the tool bar to the bottom of the spring bar. For
reference, the factory setting is roughly 12 1/2 inches
(31.8 mm).
4) Determine the new bar length required and loosen
the clamp bolts (1).
5) Use a mallet to adjust the bar height and re-tighten
the clamp bolts (1) once the desired height is achieved.
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48646
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3
Coulter Down-Force Adjustment:
Coulter springs are factory preset at 10 in. (25.4 cm),
giving coulters an initial operating force of 400 pounds
before the spring compresses. This setting is ade-
quate for many difficult no-till conditions.
To adjust the coulter spring:
1) Completely raise the drill and determine the new
desired spring length.
2) Measure the current length of the spring(s) to be
changed. If the springs already measure shorter than
9 3/4 in. or longer than 10 1/4 in., do not further adjust
them.
3) Loosen the jam nut (2).
4) Rotate the adjuster nut (3) until the spring is at the
desired length. Re-tighten the jam nut.
Note: If all springs are continuously in compression,
the coulters can lift the drill off the ground (at the
ground drive wheel), resulting in low seeding rates
and uneven seed depth. If high forces are required,
frame weights are probably required.
Spring Length Force At Blade
10 1/2 in. (26.7 cm) 175 lbs. (79 kg)
10 1/4 in. (26.0 cm) 300 lbs. (136 kg)
10 in. (25.4 cm) 400 lbs. (181 kg)
9 3/4 in. (24.8 cm) 525 lbs. (238 kg)
Opener Down Pressure Adjustment:
The “W” clips located on the opener spring rods
should be in the lowest hole. This is the correct loca-
tion in all conditions. The “W” clips can be raised on
openers behind wheel tracks only if penetration is not
adequate.
48645
Document #DRUS100C-0003A 4 of 4
48642
T-Handle Adjustment:
The depth of each opener is controlled by the height of
the press wheel. Varying the height of the press wheel
changes the seeding depth of the opener. Moving the
“T” handle to the front of the opener shallows the
depth; moving the “T” handle towards the rear of the
opener increase the depth. For a starting point, place
the “T” handle towards the center.
48509
A
B
C
D
Feed Cup Adjustment:
Each feed cup is equipped with a four-position adjust-
ment handle:
A) The highest position is for wheat and other small
grains
B) The second position is for soybeans and other large
grains
C) The third position is used if the seeds are cracking
in the second position
D) The bottom position is for clean out and will drain all
seed
Note: Do not open the feed cup handle to the bottom
position with seed in the box unless complete clean out
is desired. Changing this handle will change the seed-
ing rate. When storing after drilling season, it is best to
place the handle in the bottom position to prevent dam-
age from mice.
Selecting Drive Type:
The gearbox is designed to give a variety of drive
speeds for different types of seed and rates. It is a lin-
ear shaft pattern design with constant mesh gearing
and is totally sealed to keep any dirt out. No lubrication
is required unless service is needed.
1) To set the gearbox, simply move the selector handle
until the desired drive type appears in the window on
the handle:
48877
Main Seed Box Drive Type Ratios
Drive Type 2 is 2.06 Times Faster Than 1
Drive Type 3 is 3.08 Times Faster Than 1
Drive Type 4 is 5.03 Times Faster Than 1
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