Opener sub-frame adjustment – Great Plains NTA3007 Operator Manual User Manual
Page 110
106
NTA907 or NTA3007
Great Plains Manufacturing, Inc.
166-371M
2012-07-02
Opener Sub-Frame Adjustment
Opener bodies must be parallel to the ground for
consistent results. At higher down-pressures, openers
can tend to tilt forward, resulting in coulters running too
deep or at irregular depths, inconsistent planting depth,
and inconsistent or light furrow closing by the press
wheels.
A mechanical adjustment may be necessary at higher
down-pressures (and needs to be undone for later
operations in lighter conditions). Shims are removed or
re-installed at the interface between the opener
sub-frames and the parallel arms of the Lift system.
Two sets of two shim sizes (4 shims total at each site)
provides a range of seven thicknesses up to
19.1 mm (0 to
3
⁄
4
inch) in increments of
3.2 mm (
1
⁄
8
inch). Shims are slotted to allow easy
removal and insertion.
Refer to Figure 104 and
(depicting the centre section parallel arms)
Shims are located at the rear of lower parallel arms.
If you observe the rear end of the row units riding higher
than the front ends, you can reduce the tilt by removing
shims. Remove a shim thickness equal to about half (or
less) of the excess height at row rear.
Centre section and wings may require different
adjustments. In a section, however, always make the
same adjustment to both sites in that section.
1.
Partially or completely unfold wings, and lower rows
to ground. Shut off tractor.
2.
At each shim site, loosen, but do not remove, four
nuts
at shim end of lower parallel arm.
3.
Use the top holes in the shim stack to remove or
re-insert shims
.
4.
Re-tighten nuts
.
5.
Re-check opener-ground alignment in field
conditions.
Figure 104
Sub-Frame Shim Location
29426
Figure 105
Wing Shim Details
29431
2
1
2
1
Shims
Combinations
Thin Count
0
1
2
1
2
1
2
Thick Count
0
0
0
1
1
2
2
Total (mm)
0
3.2
6.4
9.5
12.7 15.9 19.1
Total (in)
0
1/8
1/4
3/8
1/2
5/8
3/4
32174
1
2
1