Challenger 600B Series combines are also unique for their use of a Cascade Cleaning System. Sized to match the capacity of the combine and the AHS rotor, the cleaning shoe on the Challenger 660B measures 6,768 in2 (4.36 m2), while the Model 670B and 680B boast 8,296 in2 (5.35 m2) of cleaning surface. 

As crop material falls from the grain pan, it gently cascades to the chaffer via a cascade chaffer pan. The reciprocating grain pan and air from the cleaning fan begin the cleaning process by floating the residue rearward while grain falls through the chaffer openings to the lower cleaning area. Here, final crop cleaning ensures that only the cleanest grain goes into the grain tank. Grain that doesn’t fall through the sieve goes into the returns system for processing. 

Because the cleaning system uses a main and a cascade grain pan in lieu of multiple augers to move the crop, grain quality and machine reliability have been improved, while the complex drives associated with auger beds have been eliminated.

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