An 865 and 855 combine has a what is called a cascade seperator located behind the straw walkers.A cascade seperator is a basicly a drum that spins and throws the straw against a sort of concave and seperates more grain out of the straw.The grain then falls into a cross auger and then elevated to the pan under the walkers and from there of course it goes onto the sieves,saves a lot of barley.