FIELD OPERATION
4-38
SIEVES
SIEVE OPENINGS -- Figures 59 and 60
Adjust the opening of the presieve, according to the
grain size, with the lever on the right-hand side of the
sieve which is accessible after removing cover H.
The 6 mm opening is the recommended position for
most cereal crops and sunflower.
When operating in damp conditions, a larger opening
(9 or 12 mm) can be recommended to avoid plugging
of the presieve.
For small seeds, a 3 mm position can be chosen.
For high moisture maize, a presieve is available as an
accessory.
Adjust the openings of the upper and lower sieve, ac-
cording to the grain size, with the levers at the rear of
the sieves. Operate with the sieves open as wide as
possible, consistent with producing a clean sample.
The lower sieve is equipped with a sieve opening indi-
cator J.
The rear part of the upper sieve can be adjusted sepa-
rately. It may be necessary for the rear part to be
opened a few millimetres more than the upper sieve
opening to prevent loss of the returns, particularly
when harvesting wheat.
When harvesting maize, keep the upper sieve closed
as much as possible to sieve all the grain and to pre-
vent the maize cobs from passing through the sieve
and entering the grain tank.
SIEVE POSITION
The upper sieve is normally fitted in the lower position.
The upper position is recommended when harvesting
maize.
The lower sieve is set at the factory in the lower
position. The upper position can be used if a higher
capacity with less clean grain sample is required.
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