Maikeyier is a Chinese factory supplier of combine harvester threshing system parts, covering wear parts for all series of harvesters across four major brands: Kubota, Yanmar, Lovol, and World. Our product range includes harvester threshing elements, separation elements, drum assemblies, drive and adjustment components, and guard and auxiliary parts. We are committed to providing high-quality, one-stop threshing parts supply services to the global agricultural aftermarket.
Harvester Threshing System Wear Parts
The threshing system is one of the core working systems of a combine harvester. Its operating principle is to use high-speed rotating threshing elements to apply impact, rubbing, and combing action to the crop, causing the grain to separate from the ear, and then separating the grain from the straw through the separation device. It directly determines the cleanliness of harvesting, loss rate, and operational efficiency. Like the running chassis parts, threshing system parts are among the most frequently replaced components on a harvester.
Threshing Bow Teeth
Apply impact and rubbing force to the crop to separate grain from the ear
U-shaped Dum Blades
Assist in cutting and guiding the crop into the threshing clearance, improving threshing efficiency
Threshing Bars
Core components on which threshing teeth are mounted; withstand high-speed rotation and high-frequency impact
Threshing Concave Screens
Work with the threshing drum to achieve the initial separation of grain from straw
Threshing Ddrum Assembly
Carries all threshing elements for high-speed rotation; the core rotating body of the entire threshing system
Threshing Bbelts
Transmit engine power to the threshing drum to ensure normal operation of the threshing system
Belt Tension Wheels
Adjust threshing belt tension to ensure transmission efficiency
Threshing Clutch Linkage
Control the engagement and disengagement of the threshing system
Drum Cover Plates
Protect threshing components and guide crop flow direction
Threshing Bearings
Support the high-speed rotation of the threshing drum and drive shafts
Harvester Threshing System Classification
By location and function, Maikeyier divides threshing system parts into five major categories – core working components, separation and screening components, core rotating assemblies, power transmission systems, and guard and auxiliary parts – to help you make quick decisions during procurement.
Threshing Elements
Component | Material / Process |
Threshing bow teeth | Alloy steel forging + heat treatment |
U-shaped drum blades | Alloy steel forging + heat treatment |
Threshing teeth | Alloy steel precision machining |
Threshing bars | High-strength structural steel |
Separation Elements
Component | Material / Process |
Threshing concave screens (concave sieves) | Precision casting + reinforcing rib structure |
Concave screen assemblies | Welded structure + wear-resistant treatment |
Separation screens | High-strength steel wire woven / perforated plates |
Drum Assemblies
Component | Description |
Threshing drum assembly | Includes drum body, threshing teeth, bearing housings, etc. |
Axial flow drum pulleys | 3-groove pulleys (315/275/255/245) |
Drum bearing housings | Precision casting + precision machining |
Drive and Adjustment Components
Component | Description |
Threshing section belts | Auger belts, straw chopper belts |
Threshing clutch connecting rods | Tension adjustment devices |
Belt tension wheels | Bearing-type tension wheels |
Drive chains | Threshing drive chains |
Guard and Auxiliary Parts
Component | Description |
Drum cover plates | Guard and inspection cover plates |
Threshing chamber guard plates | Wear-resistant guard plates |
Threshing System Parts - Application Scenarios
Rice harvesting:Rice grains are easily detached, requiring the highest precision and efficiency from the threshing system.
Wheat harvesting:Wheat ear threshing demands high wear resistance of threshing teeth.
Soybean harvesting:Pod threshing requires a gentler threshing method.
Rapeseed harvesting:Seeds are small, requiring strict control of threshing clearance and separation accuracy.
Quality Requirements of Combine Harvester Threshing System Parts
Quality Aspect | Specific Requirements |
Material strength | Threshing bow teeth, U-shaped drum blades, etc., must be made of high-quality alloy steels (20CrMnTi, 40Cr, 42CrMo, etc.) to ensure impact resistance and wear resistance. |
Dimensional accuracy | Threshing clearance directly affects threshing performance; part dimensions must be precise to ensure that clearance meets standards after assembly. |
Heat treatment hardness | Threshing elements must undergo heat treatment to achieve surface hardness and maintain internal toughness to avoid fracture. |
Dynamic balance | Drum assemblies must be dynamically balanced to avoid severe vibration during high-speed rotation. |
Wear life | Wear parts must have a service life that meets at least one normal harvest season’s operating requirements. |
Combine Harvester Threshing System Parts Supplier – Maikeyier
Whether you are looking for OEM harvester threshing system parts or aftermarket parts, you need a supplier that can provide one-stop complete machine parts supply services, reducing procurement time and maximizing cost-effectiveness. As a factory-based supplier, Maikeyier looks forward to working with you.
Why Choose Maikeyier Threshing System Parts?
In-house forging plant:High-strength threshing elements such as threshing bow teeth and U-shaped drum blades can be produced in-house by forging.
Full coverage of four major brands:One-stop supply of threshing parts for all series of Kubota, Yanmar, Lovol, and World harvesters.
Five comprehensive categories:From threshing elements to separation elements, covering all category needs of the threshing system.
Strict quality control:Forged harvester parts are produced in-house for quality control from the source; other parts are inspected upon warehouse receipt with rigorous quality control.
Flexible procurement:Supports free samples, sample orders, mixed-lot complete machine parts, full-container wholesale, and more.
Fast delivery:Lead time of 5-25 working days.
Combine Harvester Parts
Agricultural Machinery Forged Parts Factory – Maikeyier
Maikeyier’s Quality Assurance for Threshing Parts
Considering that harvester threshing parts are subjected to high-frequency impact, severe wear, and alternating stress during operation, wear resistance and impact resistance are very important. Every threshing system part shipped by Maikeyier undergoes rigorous durability testing to ensure that the product fully meets customer requirements.
- Material selection:High-grade alloy steels such as 20CrMnTi are used.
- Heat treatment:Carburizing / quenching + tempering – surface hardness meets standards, core toughness is maintained.
- Welding process:Dedicated welding fixtures + low-temperature tempering to eliminate residual welding stress and improve fatigue resistance.
- Precision machining:High-precision CNC machining ensures accurate assembly dimensions.
- Dynamic balance correction:Drum assemblies are corrected to ensure that the machine’s service life is not affected.
- Quality inspection:100% inspection of hardness, dimensions, and appearance; every batch is traceable.
Frequently Asked Questions (FAQ)
A: The replacement cycle for threshing bow teeth depends on operating area, crop type, and field conditions. It is generally recommended to check tooth thickness every 200 hours. When one side wears to less than 2.5 mm, the tooth can be reversed; replace after both sides are worn. Life is longer when harvesting easily threshable crops like rice, and shorter when harvesting difficult crops like wheat.
A: Replacement is recommended when:
- screen openings are enlarged by more than 20% due to wear;
- reinforcing ribs are severely worn, reducing structural strength;
- the screen surface shows obvious deformation or cracking.
Worn concave screens lead to incomplete separation and increased grain loss.
A: Threshing belts should be inspected every 400-500 hours.
Replace when:
- the belt surface shows cracks or the protective layer is peeling;
- belt elongation exceeds the tension adjustment range;
- the belt shows signs of scorching or hardening.
When replacing, all belts should be replaced together if there are multiple belts.
A: Reverse the tooth when the single-side thickness wears to less than 2.5 mm; replace promptly after both sides are worn.
A: OEM threshing parts are produced by the OEM or its designated suppliers, strictly following original standards. Aftermarket threshing parts are produced by independent manufacturers (such as Maikeyier) according to original specifications. Choosing quality aftermarket threshing parts (such as bow teeth and U-shaped drum blades produced by forging) can significantly reduce procurement costs while approaching OEM quality levels.
A: Threshing parts support mixed-lot orders; different categories can be combined in one order. Specific MOQs vary by product type. Please contact us for a detailed quotation.
Fmworld Parts
Lovol Parts
Yanmar Part
Kubota Part
Whether you need threshing bow teeth, U-shaped drum blades, threshing concave screens, threshing belts, or threshing drum assemblies – by material, quantity, or specification – Maikeyier can provide you with high-quality, cost-effective threshing system parts solutions, complete product catalogs, and tailored quotations.