Used Combine Harvester Separation Parts: Catalog and Guide

Located between threshing and cleaning, the separation components play a central role in crop quality. A clogged sieve, a worn rotary separator, or a faulty variable speed drive can cause significant grain losses, often between 2% and 5% of total yield during a day of harvesting.

Choosing used replacement parts is a solid option, especially for large farms looking to control costs without compromising machine operation. Manufacturers like John Deere, New Holland, Case IH, or Massey Ferguson design these parts to withstand heavy mechanical stress, giving them a lifespan compatible with second-hand use after refurbishment.

What Are the Parts of a Combine Harvester?

• The cutter bar, equipped with a reel and auger, is the first essential machine component.
• The dividers, located on either side of the cutter bar, precisely define the width of the harvested area.
• The feeder channel transports cut crops to the threshing mechanism via conveyor parts.
• The threshing drum and concaves form the threshing unit where grains are released from the ears by impact.
• The separation system, consisting of straw walkers or a rotary separator, performs initial grain-straw separation.
• The cleaning system, with its sieves and fan, removes residual debris for clean grain.
• The grain tank stores the cleaned grain before transferring it to the trailer, completing the efficient harvesting cycle.

Separation by Straw Walkers (Conventional Machines)

In conventional combine harvesters, straw walkers are the traditional separation components. Their primary function is to lift and shake the straw to release any remaining grains after the threshing drum, imparting a characteristic oscillating motion.

A machine can have between 4 and 7 straw walkers depending on its processing capacity. The more walkers there are, the larger the working surface — which reduces losses in tough conditions, especially during high-yield crops or delicate crops like oilseed rape.

Wear parts to monitor in this system include transverse bars, straw walker bearings, and floor plates. When selecting replacement parts, the length of the straw walker and its mounting spacing must exactly match the machine’s model to avoid prolonged downtime during peak harvest.

Separation by Axial Rotor or Rotary Separator

• The axial rotor replaces straw walkers with a rotating cylinder that spirals material along its entire length.
• This technology, adopted by Case IH with Axial Flow, significantly improves the quality of harvested grain.
• Key parts include the rotary separator shaft, housing, counter separator, and separator star.
• The rotary counter separator wears progressively due to repeated friction and should be checked each season.
• A cracked or deformed rotary separator housing causes abnormal vibrations detectable from machine start-up.
• Parts for this system are brand-specific and not interchangeable between models.
• A complete used rotary separator is a cost-effective solution provided the shaft shows no warping.

Straw Walker, Sieves, and Variable Speed Drive: Key Parts

Located immediately after the threshing drum, the straw walker is a corrugated sheet metal cylinder whose rotation moves straw toward the separation components. Its speed, deliberately slower than the threshing drum, creates a differential that releases the last grains trapped in the crop mass. A deformed or cracked straw walker plate directly disrupts this flow, causing measurable losses early in operation.

Sieves calibrate grain passage according to size. A clogged sieve or one with bent slats reduces the effective screening area and unnecessarily returns grain back to the ear return system.

The variable speed drive regulates the rotation speed of separation components based on harvest flow. Replacing it with a used part restores full adjustment range at a lower cost, especially useful for machines harvesting multiple crop types in a single season.

Used Separation Parts by Brand

• Claas Lexion and Dominator combines use straw walkers with specific geometries, incompatible between series.
• For John Deere, the W and T Series require separation sieves with different dimensions depending on the exact model.
• Case IH Axial Flow demands rotors and rotary counter separators unique to its technology, not available on other brands.
• New Holland offers two distinct setups: straw walkers on TC series and rotors on CR series, with dedicated parts for each.
• Massey Ferguson MF 7200 and MF 9000 share some sieve references, facilitating the search for used parts.
• Deutz-Fahr has a less extensive separation parts catalog, making used parts especially financially attractive.
• Checking the manufacturer’s stamped reference on the original part is the most reliable method to ensure compatibility.

When to Replace Separation Parts?

Several clear signs indicate a separation part is nearing the end of its life. Visible grain losses behind the machine, increased grain content in straw, or unusual vibrations during operation are early symptoms to take seriously.

A visual check before each season is standard practice. Deformed sieves, cracked bars, or worn bearings showing play must be replaced before harvest starts — waiting for a breakdown during the season is much more costly than a planned replacement.

Replacement frequency varies with machine usage. On a machine working 200 to 300 hours per season, some wear parts reach their limit in 3 to 5 years, depending on the crop and harvesting conditions.

TMC Bejenne: Used Separation Parts All Brands

• TMC Bejenne maintains a permanent stock of separation parts: main shafts, sieves, variable speed drives, and complete rotary separators.
• Demolition combines in the yard directly supply this stock with recovered and inspected components.
• Each reference is identified by brand and model to guarantee immediate compatibility with your machine.
• The technical team assists farmers in precisely identifying the required part, including for older models.
• Parts are available for pickup or swift shipping to minimize machine downtime during the season.
• Claas, John Deere, Case IH, New Holland, Massey Ferguson or Deutz-Fahr: the catalog covers the major brands on the French market.
• For any inquiry, contacting TMC Bejenne directly ensures a response tailored to the exact combine model.