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2. THRESHING
As the drum 6 rotates, it rubs the crop against the
concave bars 7. This rubbing action threshes the
grain from the straw (approximately 90% of the
grain).
Clean grain falls onto the grain pan 8.
•
Straw (and remaining grain) are guided to the
•
beater 9.
De-awning slats (accessory) can be installed on
•
the front part of the concave to improve the
threshing efficiency (especially important in wheat)
and to avoid white caps.
De-awning plates (two or four) can be installed
•
underneath the concave to increase the rubbing
action when threshing winter barley or difficult to
thresh crops.
3. SEPARATION
If a rotary separator is installed:
The beater 9 strips the straw from the drum 6 and
guides it into the rotary separator 10 and concave 11,
which further separates the grain from the straw.
The straw retarding curtain 12 prevents the beater 9
or the rotary separator 10 from throwing the straw too
far onto the straw walkers 13.
The straw walkers 13 oscillate, lift and tumble the
straw, permitting the remaining grain to fall through
the walkers and slide down the walkers return pans
14 onto the rear of the grain pan 8.
The straw is carried over the walkers and out of the
back of the combine and is in laid in a swath or
chopped by the straw chopper 30 (if installed).
3−6
SECTION 3 − FIELD AND SITE OPERATION
4. CLEANING
The grain and the chaff are moved to the front of the
upper sieve 15 where a initial cleaning takes place.
The cleaning fan 16 blows the chaff over the upper
sieve and extension 17 out of the machine, while the
grain, unthreshed heads and small quantities of chaff
fall onto the lower sieve 18.
The lower sieve 18 finally cleans the grain. Grain that
passes through the lower sieve is carried over the
grain plate 19 to the clean grain cross auger 20.
Unthreshed heads which do not fall through the lower
sieve are transported by the returns cross auger 21
and returns elevator 22 to the drum for rethreshing.
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