Grain quality
Grain not threshed from heads or shelled from cob orpod
Possible Cause Correction
Concave clearance too great.
Decrease concave clearanceand
adjust cylinder speed to prevent
cracking.
Cylinder speed too slow.
Increase cylinder speed enough to do
good job of threshing. Do not increase
speed to point where grain cracking is
excessive.
Concave not level.
Uneven feed to cylinder.
Level concave to cylinder.
Refer to section on UNEVEN OR
BUNCHED FEEDING (PG. 16).
Insufficient material entering cylinder.
Increase ground speed for moreintake
of material.
Cylinder bars worn or damaged. Replace cylinder bars.
Cylinder not aggressiveenough. Replace cylinderbars.
Concave extremely worn or damaged. Replace concave.
Crop very difficult to thresh.
Install concave fillers. On combines
equipped with optional tailingsreturn,
adjust handle to return tailings to
cylinder.
Material lodging outside of cage
Possible Cause Correction
Crop condition.
Plugging only on front top ofcage
normal in some conditions.
Material not being deliveredby
distribution auger.
Check and repair drive forbelt
slippage.
Cylinder speed too high. Decrease cylinder speed.
Cylinder bars or helical barsworn. Replace cylinder bars or helicalbars.
Concave plugged with mud or dirt,etc.
Cylinder discharge metal paddlesworn
or missing.
Clean concave.
Repair discharge.
Discharge impeller or straw chopper
drives slipping.
Repair by checking and replacingworn
belts and damaged sheaves. Adjust
belt tensions.
Concave clearance too close.
Increase clearance (maximum
recommended clearance 0.75” (19
mm)).
Separator grate cover needed.
Install the separator grate cover onthe
separator grate.
Vertical helical bar closest tochopper.
Remove vertical helical bar closest to
chopper (soybeans & wheat in some
conditions).
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