SECTION 4
4-27
DRUM AND CONCAVE
PARAMETERS
Parameters for selecting the drum speed and con-
cave clearance are:
S T ype of crop
S Crop maturity and variety
S Moisture content
S Volume of straw and grain
S Weed contamination
FUNDAMENTALS OF ADJUSTMENT
S Maximum drum speed and minimum concave
clearance give maximum threshing efficiency.
S If grain is damaged or straw is chopped exces-
sively, reduce the drum speed and/or increase the
concave clearance.
S If grain is not fully separated from the ears, in-
crease the drum speed and/or reduce the concave
clearance.
S If plugging or wrapping occurs, increase the drum
speed.
DRUM SPEED
The drum speed is adjustable electrically from the op-
erator’s platform and can be read from the InfoView
monitor (see further).
IMPORTANT:
Actuate the drum variator switch only with the
threshing mechanism running.
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