Grain quality
Sieves plugging with straw and chaff
Possible Cause Correction
Insufficient air blast from cleaningfan. Increase fan choke setting.
Sieve opening too wide.
Consider increasing air, then decrease
sieve opening in 0.06” (1.6 mm)
increments.
Chaffer opening too wide.
Decrease chaffer opening in 0.06”(1.6
mm) increments.
Missing or improperly installed faninlet
screen.
Properly install all fan inletscreens.
Shutting down machine before ithas
cleaned out.
Allow crop to pass through and clear
machine before disengagingseparator.
Incorrect chaffer for cropbeing
harvested.
Round end, shallow tooth 1.125” (28.6
mm) spacing - used in all cropsexcept
corn. Round end, deep tooth 1.625”
(41.3 mm) spacing - generallyused
in corn but has also been found to
provide desired cleaning in some crops
such as soybeans and high moisture
cereal grains where more air volume is
desired.
Square end, deep tooth 1.625” (41.3
mm) spacing - generally used in high
moisture corn to remove pieces ofcob
from the grain tanksample.
Incorrect air pattern.
Inspect fan, fan choke, shoe airduct
and splitterlocation.
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