Grain quality
Grain not threshed from heads or shelled from cob or pod
Possible Cause Correction
Concave clearance too great.
Decrease concave clearance and
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. Level concave to cylinder.
Uneven feed to cylinder.
Refer to section on UNEVEN OR BUNCHED
FEEDING (PG. 16).
Insufficient material entering cylinder.
Increase ground speed for more intake
of material.
Cylinder bars worn or damaged. Replace cylinder bars.
Cylinder not aggressive enough. Replace cylinder bars.
Concave extremely worn or damaged. Replace concave.
Crop very difficult to thresh.
Install concave fillers. On combines
equipped with optional tailings return,
adjust handle to return tailings to
cylinder.
Material lodging outside of cage
Possible Cause Correction
Crop condition.
Plugging only on front top of cage
normal in some conditions.
Material not being delivered by
distribution auger.
Check and repair drive for belt
slippage.
Cylinder speed too high. Decrease cylinder speed.
Cylinder bars or helical bars worn. Replace cylinder bars or helical bars.
Concave plugged with mud or dirt, etc. Clean concave.
Cylinder discharge metal paddles worn
or missing.
Repair discharge.
Discharge impeller or straw chopper
drives slipping.
Repair by checking and replacing worn
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 on the
separator grate.
Vertical helical bar closest to chopper.
Remove vertical helical bar closest to
chopper (soybeans & wheat in some
conditions).
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