Core working mechanisms: Cutting, threshing, and cleaning
A modern combine harvester performs sequential mechanical processes that separate clean grain from straw and chaff.
- Cutter bar and reel: Gathers and cleanly slices standing crop stalks, feeding them uniformly into the central auger.
- Threshing drum and concave: Rubs and beats grain heads against the concave grate to dislodge kernels without grain damage.
- Straw walkers and chaffer sieves: Agitate the harvested biomass to separate loose grain from long straw.
- Cleaning fan and winnower: Directs a controlled blast of air to blow lightweight chaff and dust out the rear while clean grain enters the tank.
Machine configurations: Self-propelled, tractor-mounted, and track types
Harvesters are available in specialized configurations adapted to varied soil conditions and field sizes.
- Self-propelled wheeled combines: High-capacity multi-crop harvesters ideal for large contiguous wheat and soybean fields.
- Track / Crawler combines: Equipped with rubber tracks for floating over soft, waterlogged wetland paddy fields without sinking.
- Tractor-mounted combines: Economical units powered by 55+ HP agricultural tractors, popular with custom hiring entrepreneurs.
- Super Straw Management System (SMS): Chops and evenly scatters crop residue behind the combine to facilitate zero-till sowing.
Custom hiring economics, maintenance, and SMAM subsidies
Daily maintenance requires inspecting cutter bar knife sections, checking threshing cylinder clearances, cleaning air pre-filters, and greasing bearings. Farmers and rural custom hiring centres (CHCs) can access capital subsidies to purchase combine harvesters and straw management attachments through the official Agri Machinery DBT portal.
Official source
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Agri Machinery DBT Portal (Govt of India) ↗Related on KisanPe
Common questions
What three operations are performed simultaneously by a combine harvester?
A combine harvester executes cutting (reaping), threshing, and grain cleaning (winnowing) in a single continuous field operation.
What is the benefit of a track-type combine harvester?
Track-type combines use wide rubber tracks that provide high flotation, enabling them to harvest wet, muddy paddy fields without getting stuck.
Can individual farmers receive government subsidies on combine harvesters?
Yes, eligible farmers, FPOs, and Custom Hiring Centres can apply for capital subsidies through the central Agri Machinery DBT portal under SMAM.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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