29
After performing the calibration test and adjustments, remember to return the funnel shelves to sowing
position B, see Fig. 30. Also remember to replace the crank pin in position and close the protective covers.
Performing the fertilizer side calibration test:
Remove the power transmission cassette, see Fig. 22.
Check that the fertilizer side bottom flaps are adjusted to the correct position, usually slot 2
Check, that all closing doors are open. Open these if necessary
Select the desired feed amount from the sowing table by adjusting the hand-wheel
Rotate the ground-wheel several times so that the fertilizer chambers fill and the fertilizer feed from
the test sowing chambers stabilises
Set an empty, clean calibration test trough in position
Perform a calibration test by rotating the ground-wheel the number of times stated in the sowing
table
Weigh the fertilizer collected in the trough. Use an accurate scale!
If the result does not match the desired feed amount, correct the adjustment with the hand-wheel.
Familiarize yourself with the method given for calculating probable corrections.
Perform a new calibration test to ensure that the feed amount is correct.
Remove the crank pin and return it to its position in the right side cover
Return the power transmission cassette to its position
If the machine is equipped with an TC+ on-board computer providing fertilizer remote control,
please refer to the additional instructions in the TC manual.
Clean the fertilizer side feed rollers by occasionally rotating the hand-wheel so that the feed is fully
closed. This will enable you to ensure correct feed amounts during calibration tests and during
actual sowing.
When returning the feed adjustment back to the value in practice or otherwise changing the feed
amount, always approach the desired adjustment value from the same direction.
Carrying out a calibration test only on the seed side
It is quite normal to perform the fertilizer side calibration test less often than the seed side test. For the
duration of the seed-side only calibration test, the power transmission to the fertilizer side should be
switched to idle so that no fertilizer is wasted, see Fig. 27. The fertilizer side is switched to idle by removing
the ring pin shown in the figure.
Caution! If you perform a seed side calibration only and for this reason remove the
pin from the chain-wheel located on the fertilizer shaft, BE SURE TO REMEMBER
TO REPLACE THE PIN IN POSITION BEFORE STARTING SOWING.
FORGETFULNESS WILL HINDER THE FULL FUNCTION OF THE FERTILIZER
FEED!
Instructions for improving sowing accuracy
Calibration test values given in the sowing table are for reference only. Their accuracy depends on ground
quality, cultivation depth, tire pressure, and tire manufacturing tolerances.
The sowing accuracy can be however improved by doing a tow test under sowing conditions. The tow test
is performed by towing the machine over the distance required to sow one acre under sowing conditions
and by simultaneously reducing the ground-wheel rotations. Record the value obtained and use this when
carrying out calibration tests.
If the value measured differs widely from the seeding table value, carry out a new test. In the table below,
the distance W used in the tow test refers to different working widths, each matching a one-acre sowing
area:
L = 33.3 m when working width = 3.0 m
L = 25.0 m when working width = 4.0 m
Check the area meter accuracy when performing the measurement.
