Great Plains 2S-2600F Operator Manual v2 - Manual (Page 35)

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Section 3 Adjustments
9/26/13 2S-2600 and 2S-2600F Two-Section Folding Drill 195-200M-A
Great Plains Mfg., Inc.
Seeding Depth
The 2S-2600 has double-disk openers with depth-control-
ling press wheels mounted on floating opener frames. This
system provides accurate depth control and seed place-
ment over uneven terrain. When used with live closed-cen-
ter tractor hydraulics the drill provides constant opener
down pressure through a wide range of opener movement.
The following is an introduction to the seeding compo-
nents and how they work.
Double Disk Openers
Each opener is mounted on a floating opener frame.
Opener bodies are staggered for easy soil flow. Long and
short opener bodies provide for 7" of stagger for planting
through residue. All openers pivot on a common axis to
maintain consistent depth as opener frames follow con-
tours. A single spring provides down pressure necessary
for the double disks to open a seed furrow. The spring al-
lows openers to float down into depressions and up over
obstructions. Individual openers can be adjusted to ac-
count for tire tracks. Refer to page 35 for individual opener
adjustment instructions.
Press Wheels
A press wheel is attached to each opener body. Press
wheels provide two important functions.
First, press wheels close seed furrows and gently press
soil over seed. To provide consistent seed firming, press
wheels are free to move down from normal operating po-
sition. This maintains pressing action even if opener disks
encounter obstructions or hard soil.
Second, press wheels control seeding depth. To maintain
a consistent depth, the relationship between the bottom of
the opener disks and press wheel is fixed upwardly by an
adjustable stop on each opener. The position of the adjust-
able stop determines how deep seed is placed. Raising
the stop increases seeding depth. Lowering the stop de-
creases seeding depth. Refer to page 35 for press wheel
adjustment.
Floating Opener Frames
Each drill section has an opener frame which pivots about
the center line of the drill gauge wheels. These floating
opener frames have the ability to rock the openers 15 de-
grees up and 15 degrees down as a group. By pivoting at
the gauge wheels, openers maintain a consistent depth as
opener frames rock up and back.
Down pressure for each opener frame is provided by two
cylinders working on a constant lever arm. When com-
bined with live hydraulics, the cylinders provide constant
down pressure across the width of each opener frame –
regardless of how the frame is positioned. Two cylinders
per opener frame along with special trunnions also provide
some ability for one end of an opener frame to rock inde-
pendent of the other while maintaining constant opener
down pressure across the frame. A pressure-control valve
on each circuit allows you to adjust down pressure.
The opener frame has one adjustment point for two differ-
ent operating positions – one for drilling with normal down
pressure and another for drilling with high down pressure.
Refer to Opener Frame Adjustment, page 35.
00 Series Opener Down Pressure
Crushing hazard – You will be seriously injured or killed if you are
caught between raising openers and drill frame. Always stop tractor
engine, set park bake, and remove key before adjusting or servicing
openers. Keep all bystanders well away during drill operation.
Escaping fluid under pressure can penetrate the skin causing serious
injury. Avoid the hazard by relieving pressure before disconnecting
hydraulic lines. Use a piece of paper or cardboard, NOT BODY
PARTS, to check for suspected leaks. Wear protective gloves and
safety glasses or goggles when working with hydraulic systems. If an
accident occurs, see a doctor immediately. Any fluid injected into the
skin must be surgically removed within a few hours or gangrene may
result.
Opener down pressure controls opener penetration and
press-wheel soil firming. Use only enough down pressure to
cut a furrow and maintain proper soil-firming over seed. Ex-
cessive opener down force may cause bulldozing of the open-
ers in light soil conditions, and will lead to premature wear on
opener components.
The following chart shows the approximate force at the open-
ers for a given pressure at the pressure control valve.
NOTE: To account for additional compaction from drill and
tractor tires, set pressure on inside openers slightly higher
than outside openers.
Gauge
Setting
Pounds Force at Opener Disks
6 inch rows 7 1/2 inch rows 10 inch rows
200 PSI 83 86 92
300 PSI 90 95 102
400 PSI 97 103 113
500 PSI 103 111 124
600 PSI 110 119 135
700 PSI 117 128 146
800 PSI 123 136 157
900 PSI 130 144 167
1000 PSI 137 152 178
1100 PSI 143 161 189
1200 PSI 150 169 200
1300 PSI 157 177 211
1400 PSI 163 185 222
1500 PSI 170 194 233
1600 PSI 176 202 244
1700 PSI 183 210 254
1800 PSI 190 218 264