Separation unit parts for John Deere, Claas Lexion, Case IH, New Holland, and Massey Ferguson combins.

A separation unit in a combine harvester is responsible for separating the grain from the straw and other chaff that is harvested from a crop. There are several key parts that make up the separation unit, including:

  1. Concaves: Concaves are curved plates that are used to thresh the crop and separate the grain from the chaff. They are typically made of steel or other durable materials and are adjustable to accommodate different crop types and harvesting conditions. Also known as separating grates.

  2. Rotor: The rotor is a cylindrical drum that contains a series of rasp bars or other threshing elements. As the crop passes through the rotor, the threshing elements separate the grain from the straw and chaff.

  3. Sieves: Sieves are used to separate the grain from the chaff and other debris. They are typically made of wire mesh or perforated metal and are positioned beneath the rotor to allow the separated grain to fall through while the chaff and other debris are expelled from the back of the combine.

  4. Straw walkers: Straw walkers are a series of shaking sieves that help to separate the remaining chaff and straw from the grain. As the grain passes over the straw walkers, the shaking motion causes the chaff and straw to fall through while the grain continues on to be collected.

  5. Cleaning fan: The cleaning fan is used to blow away any remaining chaff and debris from the separated grain. It is typically located near the sieves and uses a powerful fan to blow air through the crop to remove any remaining debris.

  6. Grain tank: The grain tank is where the separated grain is collected and stored until it can be unloaded. It is typically located at the rear of the combine and can hold several hundred bushels of grain depending on the size of the combine.

Together, these parts work in conjunction to separate the grain from the rest of the harvested crop and ensure that only clean, high-quality grain is collected for storage and processing.

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Separation unit

A separation system unique to each manufacturer and model complements the threshing unit. The crop requires additional processing since the degree of separation of the threshing unit does not exceed 70% on average. Therefore, some models have impeller-equipped separation systems and can maintain stable performance. A straw flap can also be added to this component; it provides a smooth pull-through effect and reduces the risk of clogging.

Conventional combine harvesters are equipped with straw walker crankshafts that oscillate up and down alternately to shake the straw and collect the remaining grain, which spills out. To improve the performance of these components, conventional machines are also equipped with one or more agitators with forks to loosen and whisk the straw as it travels through the walker.

The components of the separation system are bulky and subject to a constant movement that places them under high mechanical stress. Keeping them in perfect condition guarantees stable performance and optimal grain separation. To ensure you get reliable parts that increase your machine's performance, LANDA offers you a wide range of separation system wear parts, fully tailored to your machine, at competitive prices.

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