The DynaFlo II™ cleaning system on STS Combines makes it easier to clean grain. This system provides the capacity to match the high throughput of the STS threshing and separation.

The system pushes air through a one-piece, raised from chaffer. Air chute agitators help eliminate hair-pinning and bridging inside the air ducts, giving you cleaner samples in all crops.

Meanwhile, high-volume, high-velocity air flow is spread evenly across the width of the shoe. This high air flow keeps the crop moving smoothly through the system, and helps reduce tailings returns.

With three simple settings on the Dyna-Flo II™ system (cleaning fan speed, main chaffer, and sieve), it is easy to adjust from one crop to the next. Adjustments can be made manually from the operator's armrest console or at ground level located on the left-hand side of the combine.

• 12 percent fan speed increase.
• A single, 12-blade scroll-type design cleaning fan blows a high volume of air across the full width of the cleaning shoe.
• 20 percent of the air flows to the front chaffer, while the remainder flows to the primary chaffer and sieve. This will ensure that maximum efficiency is obtained.
• Fan speed can be quickly and easily controlled electronically from the cab, on-the-go.
• A speed range of 500 rpm to 1200 rpm allows matching the air volume to the crop and conditions for a clean-grain tank sample.
• Also available is a cleaning fan slow-down bundle (250 rpm to 600 rpm) for harvesting very lightweight specialty crops such as grass seed.

• The air chutes allow the cleaning shoe to have less air restriction, especially when operating the chopper in the low-speed mode. The improved airflow provided by the air chutes also may help enhance grain tank quality and help reduce feederhouse dust exhaust.
• Separator air chute agitators maintain consistent high performance of the efficient STS™ cleaning shoe.
• Air exhaust chute agitators will be included in base equipment for all STS combines, to prevent crop material plugging the chutes. Keeping the chutes clear prevents air pressure build-up in the cleaning shoe, ensuring good airflow through the sieve and chaffer for efficient and effective removal of chaff for cleaner grain tank samples and maximum capacity.
• The air chute agitator is a small rubber flap that bolts to the chaffer frame inside the air chute. The agitator moves up and down inside the chute with the fore/aft motion of the cleaning shoe to move material through the chute.

• The sieve stroke has been increased on the 70 Series STS. This improves the sieve performance in all crops.
• Repositioning the location of the pitman arm in relation to the swinger arm creates more aggressive sieve action, thus improving the cleaning performance of the sieve.