Cleaning
29
Sieves
On machines with manual sieve adjustment the sieve adjustment can be made at the
back of the sieves by operating levers. To close the sieves the levers needs moving to
the right, to open the sieves the levers need moving to the left.
On machines with electronic sieve adjustment, both the top and bottom sieves are
adjustable from 0 – 20mm in the cab through CEBIS. The sieves need to be open
enough to cope with high volumes of grain, over 16mm is not uncommon. With wide
sieve settings there is a need for high wind speed. It is recommended that the sieves
are only adjusted by 1mm at a time.
Returns
• The returns should be monitored regularly both in terms of volume and
composition. By looking through the window on the lower RHS of the drivers seat,
the returns can be seen. The centre tube of the auger should always be visible.
• If too much clean grain is present, open the bottom sieve by 1mm at a time.
• If too much chaff is present reduce threshing.
• If un-threshed heads are present increase threshing.
• In crops such as oilseed rape where excessive trash is a problem, it may be
beneficial to close the back section of the top sieve to reduce re-circulation
through the returns.
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