Combine Harvester Track Roller Assembly is the core load-bearing component of the tracked combine harvester undercarriage system. It is composed of 15 parts: the track roller body, track roller shaft, inner bearing, outer bearing, bearing spacer, inner floating oil seal / skeleton oil seal, outer floating oil seal / skeleton oil seal, internal snap ring (for the roller body), external snap ring, inner collar (spacer), outer collar (spacer), end cover, grease nipple, locking bolt, and locking washer. Installed at the bottom of the track frame, it directly bears the full weight of the harvester and rolls along the track guide during track operation, ensuring smooth travel of the machine. Maikeyier agricultural undercarriage parts are exported to agricultural markets in Southeast Asia, South Asia, South America, Africa, and beyond, serving as a reliable undercarriage parts supply partner for agricultural parts wholesalers, dealers, and repair networks.
Internal Components of the Combine Harvester Track Roller Assembly
A complete combine harvester track roller assembly consists of multiple precision-machined components that work together with other parts of the running system – including the drive sprocket, idler, track chain, and track shoes – to form the complete track running system.
| Component Name | Function |
| Track Roller Body | The main cylindrical part that contacts the track chain. Typically made of cast or forged steel, with the surface hardened for wear resistance. Roller bodies are available in single-flange and double-flange types. |
| Track Roller Shaft (Spindle) | The central shaft around which the roller body rotates. It has high strength and precision-machined journal surfaces to support bearings and maintain proper alignment. |
| Bearings | Combine harvester track rollers often use deep-groove ball bearings, providing smooth rotation and capable of withstanding radial and axial loads encountered in field operations. |
| Bushing | A sleeve between the shaft and the roller body or bearing, reducing friction and providing a replaceable wear surface. |
| Seal Assembly | Essential for preventing mud and water from entering the bearing cavity and keeping internal lubricant from leaking out. |
| Collar / Spacer | Positioning parts that maintain correct axial spacing between bearings, seals, and the roller body. |
| End Cover | Closes both ends of the roller body, protecting internal components and providing mounting surfaces for seal assemblies. |
| Fasteners | Hardware used to secure end covers, seals, and other components to the roller body and shaft. |
Functions:
- Support the harvester’s weight and distribute it evenly across the track contact area
- Guide the track chain along the undercarriage frame to prevent derailment
- Absorb impacts and vibrations from uneven ground
- Reduce track wear through smooth rolling contact
Track Roller Assembly Classification
Maikeyier track roller assemblies are classified by structure, sealing method, and load capacity, to suit different harvester undercarriage designs and operating conditions.
Single-Flange Track Roller
| Item | Description |
| Structural features | Roller body has a flange on only one side; simple structure, lighter weight |
| Suitable applications | Some light-duty tracked agricultural undercarriage configurations |
| Typical use | Small tracked harvesters, light agricultural machinery |
| Maikeyier production capacity | Supports batch production; suitable for aftermarket replacement needs for specific undercarriage configurations |
Double-Flange Track Roller
| Item | Description |
| Structural features | Roller body has flanges on both sides; dual guidance provides stronger track constraint |
| Suitable applications | Mainstream tracked harvester undercarriage configurations; the most widely used type on the market |
| Typical use | Undercarriages of mainstream harvesters from Kubota, Yanmar, World, Lovol, and other brands |
| Maikeyier production capacity | Double-flange track rollers are the main stocked model; ample monthly capacity to meet large-volume orders |
Sealed Track Roller
| Item | Description |
| Structural features | Utilizes labyrinth seals or floating oil seals; excellent resistance to mud and dust ingress |
| Suitable applications | Paddy field operations, muddy conditions, rainy regions |
| Typical use | Southern paddy harvesters, humid tropical markets in Southeast Asia and South Asia |
| Maikeyier process | Seal components are precision-assembled and undergo sealing performance testing before shipment to ensure mud and water cannot penetrate the internal bearings |
Heavy-Duty Track Roller
| Item | Description |
| Structural features | Reinforced roller body, larger bearing specifications, upgraded seal design; significantly increased load-carrying capacity |
| Suitable applications | Large harvesters, large-feed models, high-load operating environments |
| Typical use | Large tracked combine harvesters, long-term high-intensity continuous operations |
| Maikeyier production capacity | Heavy-duty models support custom production; roller body thickness and bearing specifications can be increased per customer requirements |
Manufacturing Process for Harvester Track Roller Assemblies
Maikeyier adheres to the core positioning of “in-house forging plant + supply chain integration.” Depending on the load conditions of different components such as the roller body, shaft, and bearings, we select suitable materials. Full process control from raw materials to finished products ensures that every track roller assembly meets export quality standards.
Raw Material Selection
| Component | Material | Selection Basis |
| Roller body | Cast steel ZG35 / Forged steel 40Mn / 45# | Cast steel for complex shapes; forged steel for high-strength requirements. 40Mn/45# forged roller bodies offer superior strength and toughness over cast steel, suitable for high-load continuous operations. Forged steel roller bodies are recommended for high-horsepower harvesters. |
| Track roller shaft | 40Cr / 42CrMo alloy steel | Alloy steel offers high hardenability and excellent fatigue resistance, capable of withstanding alternating bending and shear stresses transmitted from the roller body. |
| Bearings | Branded deep-groove ball bearings | High load-carrying capacity and rotational precision, suitable for the high-speed and heavy-load conditions of harvester running systems. |
| Seals | Oil-and water-resistant rubber / polyurethane | Maintain long-term elasticity in muddy paddy conditions, preventing mud and water ingress and lubricant leakage. |
Forging and Casting Forming
| Process Route | Applicable Scenarios | Performance Advantages |
| Hot die forging | High-load, heavy-duty models (large harvesters, slope operations) | Complete metal flow lines, dense internal structure, excellent impact and fatigue resistance; longer service life than cast steel roller bodies |
| Precision casting | Complex-shape roller bodies, medium and small harvesters | Flexible forming, controllable cost; suitable for products with high shape complexity requirements |
Machining
- Roller body machining: Precise machining of outer contour, flange dimensions, bearing mounting positions, and seal grooves.
- Shaft machining: Precision turning of journals, steps, and threaded sections to ensure fit accuracy with bearings and mounting seats.
- Mounting hole machining: Drilling, tapping, and reaming to ensure accurate bolt mounting positions.
Heat Treatment
- Roller body surface high-frequency hardening: The tread and flange surfaces of the roller body are induction-hardened to a hardness of HRC 45-52, providing excellent wear resistance while maintaining good core toughness.
- Shaft quenching and tempering: The track roller shaft is quenched and tempered (hardened and tempered) to a hardness of HB 220-280, achieving an optimal balance of strength and toughness.
- Carburizing (optional): For some high-load products, carburizing steel can be used, with a surface hardened layer depth of 1.0-1.5mm, further enhancing surface wear resistance.
Surface Treatment
| Surface Treatment | Applicable Scenarios | Rust Protection Capability |
| Anti-rust oil | Inland dry areas, short-term use | Basic rust protection |
| Electrophoretic coating | Humid environments | Uniform coating, strong adhesion, excellent corrosion resistance |
| Baked paint | Sea freight export, long-term storage | Durable paint film, good weather resistance, neat appearance |
Assembly and Inspection
- Bearings and seals are pressed into the roller body according to strict assembly procedures to ensure fit accuracy.
- Roller body rotation test: smooth rotation, no abnormal noise, no sticking.
- Seal performance test: verification that seal components are properly installed to prevent mud and water ingress.
- Final dimensional inspection: comprehensive verification of key dimensions such as outer diameter, width, and mounting hole spacing; inspection reports are retained for each batch.
Why Choose Our Harvester Track Roller Assemblies?
Professional agricultural parts supplier: Maikeyier has long-term expertise in combine harvester, tractor, and other agricultural machinery parts. Products cover running systems, threshing components, engine parts, and many other areas.
In-house forging production capability: The core metal components of track rollers are produced on our own forging production line. We directly control material quality, production schedules, and costs, delivering more durable products and competitive pricing.
Manufacturing + Supply Chain: In addition to in-house forged products, we also integrate verified partner factories to supply a broader range of harvester undercarriage and complete machine parts.
Multi-brand, multi-model support: We can match parts based on the harvester model, OEM part number, or photos of original parts provided by the customer. Our product database covers major brands including Kubota, Yanmar, Lovol, and World.
Bulk and mixed-lot procurement support: Our supply model is designed for B2B buyers – suitable for agricultural parts wholesalers, harvester parts dealers, repair shops, importers, and distributors. Mixed-lot orders with multiple part numbers are supported.
One-stop procurement: In addition to track roller assemblies, we can also supply a complete range of harvester track undercarriage and wear parts:Track Chain,Drive Sprocket,Idler,Track, Guide,Track Shoe, Track Roller, Undercarriage Parts, Combine Harvester Wear Parts.
Which Agricultural Machines Are Track Roller Assemblies Suitable For?
Our track roller assemblies are suitable for a variety of tracked agricultural machines. If you have questions, please contact us to confirm compatibility with your specific harvester brand and model.
| Category | Examples |
| Combine Harvesters | Tracked combine harvesters, standard harvesters equipped with track systems |
| Rice Combine Harvesters | Rice harvesters requiring track running systems for paddy field operations |
| Crawler Harvesters | Full-track harvesters operating in wet, muddy fields |
| Agricultural Machinery | Other tracked agricultural equipment such as tractors and rice transplanters |
Supported brands include:
- Kubota combine harvester parts
- Yanmar combine harvester parts
- Lovol combine harvester parts
- World combine harvester parts
What Parameters Need to Be Confirmed When Procuring Harvester Track Roller Assemblies?
How to quickly get a quotation from a supplier? The price of Combine Harvester Track Roller Assemblies is influenced by multiple factors. You can organize your requirements and send them to the supplier for a fast solution and pricing.
| Parameter | Description | Example |
| Harvester brand | Equipment manufacturer | Kubota / Yanmar / Lovol / World |
| Harvester model | Specific model | DC70 / AW70V / RG40 / 4LZ-6.0 |
| OEM / Reference number | Original part number (if available) | 6C040-55390 / 6C040-55380 |
| Outer diameter (Φ) | Outer diameter of the roller body | Φ150mm / Φ180mm |
| Width (W) | Total width of the roller body | 45mm / 50mm / 60mm |
| Mounting dimensions | Bolt hole spacing, bracket fit dimensions | Matched to model |
| Shaft diameter (Φ) | Diameter of the central shaft | Φ30mm / Φ35mm |
| Bolt hole size | Mounting bolt specification | M10 / M12 |
| Bearing specification | Internal bearing model | 6205 / 6305 / 6306 |
| Seal structure | Seal type | Labyrinth seal / Floating oil seal |
| Single / double flange | Flange type | Single flange / Double flange |
| Surface treatment | Rust prevention method | Anti-rust oil / Electrophoresis / Baked paint |
| Material | Roller body material | Cast steel / Forged steel |
| Unit weight | For shipping and cost estimation | Approx. 3-8 kg/piece |
Harvester Track Undercarriage Parts One-Stop Supply Product Matrix
Maikeyier is a factory supplier of agricultural parts from China. We supply not only track roller assemblies but also a full range of combine harvester chassis parts. Feel free to contact us for any harvester-related needs.
| Name | Product Description |
| Track Roller | Bears the full machine weight; rolls along the track guide |
| Track Roller Assembly | Complete set including roller body, shaft, bearings, seals, etc. |
| Drive Sprocket | Engages with the track to transmit travel power |
| Idler | Adjusts track tension and guides track running direction |
| Track Chain | Rubber track or steel track chain rail |
| Track Shoe | Ground-contacting component (steel track) |
| Track Guide | Constrains lateral track movement to prevent derailment |
| Track Link | Connecting unit of the track chain (steel track) |
FAQ – Harvester Track Roller Assemblies
Looking for a reliable combine harvester track roller assembly supplier? Whether you need standard replacement track roller assemblies, OEM-style components, or complete undercarriage parts kits, Maikeyier offers tailored manufacturing and supply chain solutions.