Great Plains NTA3007HD Operator Manual - Manual (Page 94)

90 NTA907HD or NTA3007HD
166-207M 04/04/2011
Opener Sub-Frame Adjustment
Opener bodies must be parallel to the ground for consis-
tent 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 incon-
sistent 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 oper-
ations 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 96 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 adjust-
ments. 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 condi-
tions.
Null4:
Figure 96
Sub-Frame Shim Location
29426
Null4:
Figure 97
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