M2(W) / M3(W) / M6W
23
The contents of the test trays will indicate the distribution in the field.
The optimum setting is achieved – and a good variation coefficient is achieved.
The setting of the spreader gives an insufficient overlap. Insufficient overlap
means that an inadequate quantity is spread between the tramlines – and the
tilt angle of the machine must be adjusted in steps of +2
°
. Repeat the test.
The setting of the spreader gives a too large overlap. This means that a too
large quantity is given between the tramlines – and the tilt angle of the machine
must be adjusted in steps of -2
°
. Repeat the test.
Because the test tray system is not able to assemble all of the spread quantity –
because some grains will ”jump” out of the trays – you will have fluctuations of 10-
15% (See example
)
The test has as purpose to show a tendency in direction of:
Too SMALL overlap:
TILT-angle is inc2°, until tendency is
or
Too LARGE overlap:
TILT-angle is decreased -2°, until tendency is
FOR THE SAKE OF GOOD ORDER…
it is recommended to check as follows:
•
Is the PTO speed correct?
•
Is the distance between the tramlines correct?
•
Is the spreading vanes mounted / set correctly?
•
Are the spreading vanes intact?
•
Is it a spread width or a fertiliser type, for which another vane type is necessary?
•
Is the height of the spreader over the crop correct?
•
Are the test trays correctly placed?
Example of the result if the test trays are not placed correctly.
5
°
misplacement makes a large difference of amount collected in the trays!
Optimum overlap
Too SMALL spread width/overlap
Tilt angle must be increased
Too LARGE spread width/overlap
Tilt angle must be decreased
Less collected
More collected