Vaderstad Rapid RDA 800S, Instructions Manual

Page: 66 / 122

Instructions and settings
66 Ver.2 01.11.2002
3.25 Adjusting the seed coulters
NOTE! Before carrying out any work under the drill, make sure it is fully secure.
To ensure a satisfactory sowing result, it is important that the seed boxes are correctly installed on
the drill. Determine the installation height with regard to the conditions and the wear of the disc.
When the drill has been lowered with the discs resting on firm ground, the seed boxes should not
reach the surface (C > 0 mm). For sowing without ploughing in ground rich with straw litter as
well as for sowing in light soils, too low an installation may cause the discs to stop rotating. If
installed too high, seed placement may be impaired.
The seed coulters are spring-mounted on two bolts and the soft washers press the coulters closer
to the discs as the nuts are tightened. The nuts should not be tightened so much that the coulters
cannot be rocked by hand. It is important that the coulters do not press too hard against the discs
since this increases both wear and rotation friction.
In very loose soil and/or for very shallow sowing depth, the nuts may need to be loosened.
The drill should be hosed out before replacing seed coulters. When new coulters are fitted, the
width of the gap between coulters and discs must be checked. The gap must be wider at the top to
prevent blockage by straw or other trash. If the coulters are not making contact correctly, they be
adjusted by moving the metal plates at positions A and B inside or outside the mounting. The point
of contact can also be adjusted slightly by tightening the front nut more than the rear.
Figure 3.73 Figure 3.74
Table 3.7
Position Reference gaps between discs and coulters
1 > 0 mm
2 0 mm
3 > 0 mm
A
C
B
1
2
3