Combine Harvester Drive Sprocket is the core power transmission component of the tracked combine harvester’s undercarriage system. It is mounted on the final drive shaft, with its teeth engaging the track chain links to convert engine power into the tractive force that propels the machine forward – it is a normal wear part. Maikeyier supplies drive wheels manufactured by both casting and die forging processes. Leave us a message with your part number, material, and dimensions for a free quotation!
MOQ: 200 pieces
Brands: Kubota, Lovol, World, Yanmar
Functions of the Combine Harvester Drive Sprocket
The harvester drive sprocket, also called track drive sprocket, chain wheel, drive wheel, or track drive wheel, is a toothed disc mounted on the final drive shaft of a tracked harvester. It is one of the four key components of the track running chassis, together with the track roller, idler, and track chain, forming the complete running system. Its main function is to transmit engine power into driving force, propelling the harvester forward, backward, and turning, while bearing the full load of the machine’s travel drive.
| Function | Description |
| Power transmission | Transmits rotational power from the gearbox to the track, driving the machine forward |
| Travel drive | Engages with the track via tooth profile to generate traction, propelling the harvester forward/backward |
| Steering assistance | Differential rotation of left and right drive sprockets enables steering of the tracked harvester |
| Load bearing | Withstands torque and impact loads transmitted through the running system |
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Combine Harvester Drive Sprocket for Sale
Maikeyier is a forged harvester drive sprocket factory supplier from China. Our forged product line – including drive sprockets, guide wheels, track rollers, drive sprockets, swing arms, and more – has been exported to over 20 countries worldwide. The harvester undercarriage running system is one of our most competitive product series, with support for customization and mixed orders.
By Brand
Our factory and supply chain primarily supply complete machine parts for four major harvester brands. Tell us your harvester model or part number to get product images and pricing.
| Brand | Common Models |
| Kubota | DC70, DC95, DC105, PRO series, AR series |
| Yanmar | AW70V, AW82V, AG series, YH series |
| Lovol | RG series, 4LZ series |
| World | Ruilong 102HP series, Ruilong 88HP series |
By Material and Process
There are two most common manufacturing methods for harvester drive sprockets: ductile iron casting and carbon/alloy steel die forging. Material and manufacturing route determine the price, strength, and service life of the drive sprocket. We supply seven standard material grades, with prices ranging from lowest to highest: Ductile Iron QT450-10 / QT500-7 < 45# Steel < 40Cr < 35CrMo < 42CrMo < 34CrNiMo – the higher the content of alloying elements (Cr, Mo, Ni), the higher the price and the longer the fatigue and wear life.
| Material | Typical Process | Applicable Scenario |
| Ductile Iron QT450-10 | Casting + overall quenching | Economical, standard field operations |
| Ductile Iron QT500-7 | Casting + overall quenching | Higher-strength economical option – preferred cast grade |
| 45# Forged Steel | Die forging + tooth surface hardening | Mainstream wear-resistant applications |
| 40Cr Forged Steel | Die forging + tooth surface hardening | Heavier loads, better impact resistance |
| 35CrMo Alloy Steel | Die forging + tooth surface hardening + finishing | Heavy-duty continuous operations |
| 42CrMo Alloy Steel | Die forging + tooth surface hardening + finishing | High-load, long-duration continuous operations |
| 34CrNiMo Alloy Steel | Die forging + tooth surface hardening + finishing | Flagship grade; longest service life |
Selection Recommendations:
| Customer Type | Recommended Material | Advantage |
| Regular farmers, standard harvesting | QT500-7 (Ductile Iron) | Low cost, ample stock, sufficient for standard conditions |
| Professional operators, high-load operations | 45# / 40Cr (Forged Steel) | Die forging + hardening; wear-resistant and impact-resistant |
| Large farms, commercial harvesting | 42CrMo / 34CrNiMo (Alloy Steel) | Longest service life; lowest overall operating cost |
Combine Harvester Drive Sprocket Dimensions
| Parameter | Common Reference Range | Selection Key Points |
| Track Pitch | 90 / 103 / 125 mm | Must match the track link pitch exactly |
| Number of Teeth | 11-17 teeth | Cooperates with track link count; affects engagement smoothness |
| Tip Diameter | 350-550 mm | Varies with pitch and tooth count; must match machine layout |
| Rim Width | 60-110 mm | Must match track link width |
| Bore Type | Spline / Keyway / Flange | Must match the final drive shaft connection type |
| Bore Diameter | 40-80 mm | Measuring the old part bore is the most reliable verification method |
| Unit Weight | 15-45 kg | Affects packaging and shipping cost calculation |
Casting vs. Die Forging – How Are Drive Sprockets Manufactured?
Harvester drive sprockets are primarily produced by two processes: casting and forging. The former is simpler and moderately priced, suitable for standard operating conditions. The latter is more complex, more expensive, and has higher impact resistance – the natural choice for heavy-duty applications.
Ductile Iron Casting
Cast ductile iron drive sprockets have teeth formed in one shot, suitable for standard conditions. These are supplied by our partner factories.
- Melting + nodularizing and inoculation treatment
- Molding and pouring – teeth formed in one pour
- Shakeout, cleaning, shot blasting
- Machining: turning faces/OD/bore, broaching splines, drilling, deburring and polishing
- Overall quenching heat treatment
- Powder coating for corrosion protection
Die Forging + Hardening
Forged Combine Harvester Drive Sprocket have a dense structure and complete metal flow lines; combined with tooth surface hardening, they offer excellent impact resistance and long life. These are produced in Maikeyier’s forging factory.
- Cutting to weight
- Heating to forging temperature
- Pre-forming: upsetting, drawing, piercing
- Die forging – metal flow lines continuously distributed along the tooth profile; dense structure, impact-resistant
- Trimming, piercing
- Straightening, controlled cooling
- Normalizing / annealing pre-heat treatment
- Rough machining + quenching and tempering
- Tooth profile machining
- Tooth surface induction hardening – this step determines the upper limit of wear resistance
- Finishing and final inspection
Surface Treatment, Packaging, and Quality Inspection
As a professional harvester parts supplier, Maikeyier has not only strict production standards but also rigorous packaging and quality inspection standards to ensure that every part performs and stores optimally.
Surface Treatment
| Treatment | Description | Applicable Scenario |
| Powder coating | Powder spray coating; strong corrosion protection | Standard model; suitable for humid operating environments |
Packaging Methods
| Packaging Type | Description | Applicable Scenario |
| Cage pallet | Steel cage + wooden pallet; stable stacking | Standard export packaging |
| Ton bag | Woven ton bag + waterproof liner | Bulk export shipments |
Inspection Categories
| Inspection Category | Inspection Item | Standard / Requirement |
| Visual inspection | Coating | Uniform color, no runs, no particle contamination |
| Tooth profile | Full, no missing material, no cold shuts, no porosity | |
| Spline bore opening | No burrs, no scoring | |
| Dimensional inspection | Tip diameter, pitch, bore diameter & keyway tolerance, rim width & mounting face flatness | All must conform to drawing tolerances |
| Wall thickness | Measured and verified; no material thinning | |
| Material verification | Ductile iron parts | Hardness test, typically HB 180-230; prevent gray iron substitution |
| Forged steel parts | Spectrographic re-verification of material grade; prevent Q235 being substituted for 45#/40Cr | |
| Documentation | Each batch must provide Material Test Report (MTR); first article must provide First Article Inspection Report (FAI) | |
| Heat treatment & NDT | Tooth surface hardened hardness & case depth | Sampled per drawing specifications |
| Magnetic particle inspection for batch parts | Flaw detection to prevent micro-cracks from hardening |
Drive Sprocket vs. Drive Sprocket
| Comparison Aspect | Combine Harvester Drive Sprocket | Drive Sprocket (for chain drive) |
| Applicable equipment | Tracked harvesters | Chain drive systems (conveyor chains, elevator chains, etc.) |
| Transmission method | Engages with track | Engages with chain |
| Installation position | Gearbox output end | Ends of various drive shafts |
| Function | Drives the whole machine’s travel | Drives various working components |
Combine Harvester Drive Sprocket Supplier – Maikeyier
Maikeyier is a professional agricultural parts supplier with in-house forging and supply chain integration capabilities. Our drive sprocket product range covers cast ductile iron, forged steel, and alloy steel in all material grades. Harvester parts include: header system, feeding/conveying system, threshing and separation system, cleaning system, running chassis system, power transmission system, exterior parts, and more – compatible with all series of tracked harvesters from mainstream brands such as Kubota, Yanmar, Lovol, and World.
| Advantage | Description |
| Dual-process coverage | Casting + die forging – two process routes covering all quality levels |
| Complete material range | Ductile iron QT450-10/QT500-7 → Forged steel 45#/40Cr → Alloy steel 35CrMo/42CrMo/34CrNiMo |
| Strict quality inspection | Spectrographic material verification, hardness sampling, magnetic particle inspection; each batch comes with inspection report |
| One-stop supply | Drive sprocket + track roller + guide wheel + track guide + track – complete undercarriage parts available in one stop |
| Flexible procurement | Supports mixed orders, sample orders, full-container exports – suitable for agricultural parts wholesalers, harvester parts dealers, importers, and repair networks |
Frequently Asked Questions (Combine Harvester Drive Sprocket)
Contact us for a complete drive sprocket product catalog and targeted quotation!
Whether you need economical cast drive sprockets for price-sensitive markets, forged steel harvester drive sprockets for heavy-duty customers, or undercarriage orders in mixed containers, Maikeyier can provide manufacturing and supply chain solutions tailored to your needs. Tell us the brand, model, and quantity – leave the rest to us.