Most of the grain losses from combine operation can be prevented if the grain is ripe enough when it is cut and if the machine is correctly adjusted. The machine should be adjusted for each field that is cut and adjusted several times each day for changing weather conditions. Good operation of the combine is difficult where there is a large proportion of weeds in the crop, but correct adjustment reduces the trouble. Grain loss may be at the following places: the grain platform (reel or cutter bar), the cylinder, the straw rack, and the cleaning shoe.
Every thresherman purchasing a new machine wants to do just a little better work than his neighbor. It is therefore important that he should operate his machine properly in every particular. He should make every adjustment necessary to do good work. The cylinder should be run at the proper speed and the concaves adjusted to meet the existing conditions and kind of grain, so that all the heads will be threshed clean of every kernel. The more perfect the threshing, at the cylinder, the nearer the approach to perfect separation.
It is only natural for the owner of a new combine to want to try his machine as early as possible. This results in most new combines being started in the field before the crop is ready for combining. As soon as a binder is seen in the neighbor’s field, the urge to start becomes uncontrollable. When grain is ready for binding, it is not ready for straight combining.