39
Figure 40. Coulter and arms.
The arm must be agile and must be able to drop vertically under its own weight. If the arm appears stiff,
lubricate the front end mounting parts of the arm by dropping oil onto the arm and bearing surfaces.
Mounting and adjusting a disc coulter
Disc coulters can be fitted facing either the left or right sides. In coulters, the disc coulter is usually
assembled so that the disc is always located to the side of the fertilizer coulter.
Note that the triangular splash guard, equipped with a hole (indicated by the arrow in Fig. 41), must be
dropped into position on the arm first during assembly.
The angle of the disc can be adjusted before mounting the scraper. Once the angle is correct, the disc
distances from the top and bottom edges of the coulter tube must be equal. This can be adjusted by turning
the disc mounting screw. For the duration of the adjustment, the disc mounting nut must be relatively loose.
Check the angle again after tightening.
Mount the scraper and reduce its distance from the disc surface as much as possible, however in such a
way that it does not obstruct the rotation of the disc. Adjust the scraper edge so that it is the same distance
from the surface of the coulter along its entire edge. If this is not possible within the scraper adjustment
range, alter the disc angle position slightly. Finally, check the rotation of the disc as well as the distance of
the scraper from the disc after tightening the mounting screws.
Screw and nut
Holder
Coulter
tube
Spring
Tip
Nut and bolt
