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To attain the desired coulter pressure, change the machine height: If the machine is close to its lowest
position, the extension springs that affect the coulter pressure start to tighten. The lower you adjust the
machine, the bigger the pressure achieved by the pair of draw-springs grows. The lowest position is adjusted
with the lower adjustment knob in the adjustment indicator element (Figure 4). When making the adjustment
with an Agrocont on-board computer, all the adjustment controls are electrical and there are no adjustment
knobs.
FIGURE 17. Coulter structure FIGURE 18. Coulter structure
Performing the adjustment
The adjustment must be made on the field in seeding conditions.
Adjust the coulter carriage’s adjustment bearing wheel to, for example, their middle adjustment slots.
Move the manual knob for the lowest position of the machine to its bottommost position (Figure 4) so that you
can attain maximum coulter pressure, if desired.
Lower the machine down while driving forward. Stop the tractor while the machine is down. Do not allow the
tractor to jerk backward to avoid blocking in the coulters.
Check the correct position of the machine. The machine must be horizontal in the driving direction. If
necessary, adjust the adjustment screw in the drawer’s push bar. NOTE! The beam cylinder must be in its
minimum length in the working position.
If the machine is in the same direction as the field surface and you need not adjust the push bar of the drawer,
you can check the seeding depth.
If the seeding depth is not correct, re-adjust, and perform a new test. The seeding depths vary slightly
depending on the machine’s load, the tractor used and the soil type.
NOTE! THE COULTER PRESSURE RULE ALSO AFFECTS THE SEEDING DEPTH!
Do not weigh the machine more than necessary. Adjust the maximum pressure with the adjustment indicator
element so as to attain sufficient coulter weighting in the hardest place of the field parcel, in order to achieve
the correct seeding depth. When the soil becomes lighter, lift the machine slightly if necessary, or lighten the
coulter pressure appropriately. An excessive coulter pressure increases pull resistance, increases the seeding
depth from the desired value, and unnecessarily strains the machine structures.
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