Sampo Rosenlew Comia c4, Instruction Book

Page: 82 / 141

– 80 –
Causes for table loss:
The reel has threshed the grain onto the ¿ eld due to too high or low revolutions and too wide a clearance.
Local blockage in the knife causes a depressed and uncut section in the ¿ eld. This may be due to a damaged
knife plate or ¿ nger.
Remember that uneven feed onto the cylinder causes disturbances in the whole threshing mechanism and leads
to extensive grain losses.
$OZD\VDLPDWHYHQIHHGZKHQWKUHVKLQJ
Unthreshed Grain
Check that the grain gets threshed off the heads. Check the long straw on the straw walkers as the chopper also
removes the unthreshed grains ef
¿ ciently.
Cylinder speed should be moderate and concave clearance as wide as possible to obtain unbroken grain and
straw as well as minimal grain losses. It is not necessary to aim at complete threshing. Particularly when threshing
seed grain, the minimal recommended speed setting for the cylinder should be used, as high cylinder speed dam-
ages germinability more easily than minimal concave clearance.
8QWKUHVKHGJUDLQORVVFDQEHFDXVHGE\
Cylinder speed too low
Cylinder-concave clearance too wide
Uneven feed
Crop too green in parts
Damaged cylinder or concave.
Shaker Shoe Losses
If the sample coming from the sieves taken on a shovel, for example shows grain being lost, check for the follow-
ing:
Uneven feed
Blocked concave and
or straw walkers
Excessive forward speed
Cylinder-concave clearance too small
Too much weed
Crop too damp
Straw Walker Losses
If the sample coming from the straw walkers shows grain being lost, check for the following:
Uneven feed
Blocked concave and
or straw walkers
Excessive forward speed
Cylinder-concave clearance too small
Too much weed
Crop too damp
4XDOLW\RI*UDLQLQWKH7DQN
If there is crushed or cracked grain in the sample, the reason could be
Cylinder speed too high
Cylinder-concave clearance too small
Blocked concave
Crop too green in parts