What does a combined top sieve do?

What does a combined top sieve do?

For example, to counter grain loss off the cleaning shoe, you will often open your upper sieve (chaffer) too wide to try and minimize grain loss by allowing more grain (and chaff) to fall through, Gray has seen.

Is Rice hard on a combine?

Rice harvest does not destroy a combine, it just wears some parts more. I have a 1460 with 4000+ hours and a 1480 with 7000+ hours. They just need rebuilding more often! When looking at a rice combine open up the rotor area and look at the vanes, rasp bars, cone, etc.

What do the sieves do in a combine?

If there is clean grain in the returns then the bottom sieve needs to be opened up. Closing the sieves down narrows the channel of air from the fan, increasing the actual air-pressure and thus boosting cleaning ability. In effect, closing the sieves has the same effect as increasing fan speed.

What are Concaves on a combine?

Combine concaves are used to filter grain and small straw in the treatment of grains such as rice, corn, etc. Among the components of a combine harvester, concave is located near the front of the machine, underneath a threshing cylinder.

How does a combine work?

The Anatomy of a Combine

1. The header cuts off the plant close to the ground and moves the whole plant into the machine.
2. The cut crops move toward the center via spinning augers and travel up a conveyor.
3. The threshing segment of the combine beats the cut crops to break and shake the grains away from their stalks.

How to adjust the settings of a combine?

When adjusting your combine the initial combine settings should be as follows: ” Cylinder the highest setting. ” Concave the smallest setting. ” Pre-cleaner the smallest setting. ” Chaffer sieve the largest opening. ” Tailings sieve mid range. ” Cleaning sieve the largest setting.

What’s the best way to adjust the fan on a combine?

” Concave the smallest setting. ” Pre-cleaner the smallest setting. ” Chaffer sieve the largest opening. ” Tailings sieve mid range. ” Cleaning sieve the largest setting. To fine-tune the fan, get the combine driver go one mile an hour and bump up the fan speed until a few seeds starts to blow over.

What should concave module clearance be on 88 series combine?

Of course if the soybeans dry down during the day, you will reevaluate rotor speed. Concave module Clearance: Depending on the vintage/model of the combine, this can be different. The new 88 series calls for 15 to 25 MM. Other models might say 3 to 4 on the indicator.