Great Plains 3S-3000HDF Operator Manual v2 - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 53
2014-02-11 Table of Contents Index 195-068M
Opener-Subframe Adjustment
Refer to Figure 49
Each drill section has an opener frame which pivots
about the centerline of the drill gauge wheels. These
floating opener frames have the ability to rock the
openers 15 degrees 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
combined 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 independent of the other while maintaining
constant opener down pressure across the frame.
FigureSpacer At higher down-pressures (above 1800 psi), the row units
can tend to tip forward. An adjustment to the
mainframe/subframe pivot corrects this.The opener
frame has one adjustment point
for two different
operating positions.
Refer to Figure 50 (shown at factory setting)
You can adjust opener frames between two operating
positions–one for normal down pressure and one for
higher down pressure. The adjustment is near the
opener frame pivots. There are three holes and two
bolts. The bottom bolt
serves as the pivot. The top bolt
is for adjustment.
• For normal drilling conditions, keep top bolt in second
(middle) hole at all six frame pivots. Use this setting
when drilling with opener down pressure below 1800
psi.
• When drilling with opener down pressure above 1800
psi, place top bolt in top hole on all six pivot points
across drill.
To change the bolts (to high pressure):
1. Have a jack at hand.
2. Loosen the nuts on all the top bolts .
3. Lower the opener sub-frames.
4. Put the tractor hydraulic circuit for the openers in
float.
5. Place jack under an opener tool bar at an arm.
6. Lift the tool bar until the bolt is free.
7. Remove the bolt.
8. Repeat step 5 through step 7 the other arm of the
subframe.
9. Raise the jack until the top holes are aligned.
10. Insert the bolt in the top hole and spin on a nut.
11. Repeat step 5 through step 10 for each sub-frame.
12. Tighten all nuts.
Changing from high to low is similar, except lower the
jack at step 6 and reverse the bolt movement.
FigureSpacer
Figure 49
Opener-Frame Pivot
18857
1
2
1
2
FigureSpacer
Figure 50
Opener-Frame Adjustment
15558
3
4
5
2
3
4
5
4
5