Great Plains 3S-5000HDF Operator Manual - Manual (Page 49)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 45
2012-08-14 Table of Contents Index 195-325M
Opener Frame Adjustment
Refer to Figure 40
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. A
pressure-control valve on each circuit allows you to
adjust down pressure.
The opener frame has one adjustment point for two
different operating positions, one for drilling with normal
down pressure and another for drilling with high down
pressure.
Refer to Figure 41
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
hole. Use this setting when drilling with opener down
pressure below 1600 psi.
When drilling with opener down pressure above
1600 psi, place top bolt in top hole on all six pivot points
across drill.
Figure 40
Opener Frame
34303
Opener Frame
Pivot
Opener Frame
Adjustment
Figure 41
Opener Frame Adjustment
15558
1
2
1
2