Grain quality
Foreign material in clean grain
Possible Cause Correction
Engine not up to correctspeed.
Adjust engine high idle toproper
speed.
Separator drive belt, fan drive belt,or
cleaning shoe drive beltslipping.
Inspect drives, replace any damaged
belts and adjust idlers as required.
Missing or plugged fan inletscreen. Clean or reinstall fan inletscreen.
Uneven feed to cylinder.
Refer to section on UNEVEN OR
BUNCHED FEEDING (PG. 16).
Insufficient material entering cylinder.
Increase ground speed for moreintake
of material.
Incorrect chaffer for cropbeing
harvested.
Round end, shallow tooth 1.125” (28.6
mm) spacing - generally used in corn
but has also been found to provide
desired cleaning in some crops such
as soybeans and high moisturecereal
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 tanksample.
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.
Uneven opening of sieve orchaffer
louvers.
Straighten louvers or replace sieveor
chaffer.
Chaffer opening too wide.
Consider increasing air, then decrease
sieve opening in 0.06” (1.6 mm)
increments.
Finishing sieve required for cropand
crop conditions.
A number of finishing sieves are
available and can be used to provide
best clean in crops such assoybeans
and small or lightseeds.
Excessive tailings allowing uneven
distribution of material on thecleaning
shoe.
Refer to EXCESSIVE TAILINGS (PG.
23)
condition section.
Cleaning shoe overloaded due toover
threshing.
Refer to remedies listed under
MATERIAL LODGING OUTSIDE OF
CAGE (PG. 20).
Excessive cob breakage from cage.
Optimize concave setting and cylinder
speeds.
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