GREAT PLAINS NTA3007HD, Руководство оператора

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NTA907HD and NTA3007HD Table of Contents Index Adjustments
Great Plains | 166-207M | 02/26/2019 Table of Contents Index 89
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 between
0 and 19.1mm (0-
3

4
in) in increments of 3.2mm (
1

8
in).
Shims are slotted to allow easy removal and insertion.
Refer to Figure 94 and
(depicting the center 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.
Center 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 94
Sub-Frame Shim Location
29426
Figure 95
Wing Shim Details
29431
1
2
1
2
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
1
2
1