SUMITOMO / CASE / JCB KRA1717 / KRA1251 / KRA1267 / KRA13750 / 47758433 Track Lower Roller Assembly – Mining Quality – Chassis Components Factory and Manufacturer / cqctrack

1. Universal Undercarriage Component: Multi‑Brand Track Lower Roller Assembly for SUMITOMO, CASE and JCB Excavators

The SUMITOMO / CASE / JCBKRA1717 / KRA1251 / KRA1267 / KRA13750 / 47758433Track Lower Roller Assembly represents a highly versatile undercarriage component designed to serve three of the world‘s leading excavator brands: SUMITOMO (SH200, SH210 series), CASE (CX210, CX240 series) and JCB (JS200, JS210 LC series) . This multi‑brand compatibility makes the component an essential solution for fleet operators and equipment dealers managing mixed‑brand crawler excavator fleets across mining, quarrying and heavy construction operations globally.

1.1 Primary Target Excavator Models

SUMITOMO SH200 and SH210 Series

The SUMITOMO SH200 and SH210 series are among the most popular medium‑class hydraulic excavators in global markets. The SH210-6 model, equipped with a 117.3 kW (159.5 PS) engine and operating within the 20,800–21,900 kg weight range, offers up to 6,650 mm maximum digging depth. The SH210LC-6 variant features a longer undercarriage, which increases the number of bottom rollers per side and places greater demands on the durability of each individual track roller assembly. The earlier SH200 and SH220-1/3 models, for which KRA1251is a documented reference number, remain widely operational in secondary markets, particularly in Asia, Africa and South America, where reliable aftermarket undercarriage components are essential for keeping aging fleets productive.

CASE CX210 and CX240 Series

The CASE CX210 and CX240 series crawler excavators are engineered for heavy earthmoving, mass excavation and infrastructure projects. The CX210, with an operating weight of approximately 21,584 kg, features a 153 hp engine, a 12‑foot track on ground length, and a 9‑foot tail swing radius. The larger CX240 series, including the CX240B and CX240LR variants, is designed for more demanding applications requiring increased digging forces, longer reach and greater lifting capacity. Both series share a common undercarriage platform in terms of track roller mounting dimensions and load requirements, enabling the same lower roller specification to serve both model families.

A repair service manual is available for the CASE CX210, CX230 and CX240 series crawler excavators, confirming that these three models share a common platform in which undercarriage components including track rollers are interchangeable.

JCB JS200 and JS210 LC Series

The JCB JS200 and JS210 LC series excavators are part of JCB‘s JS range of crawler excavators, known for their robust construction, excellent fuel efficiency and ease of maintenance. These machines typically operate in the 19–22 ton weight class and are widely used across Europe, the Middle East, Africa and Southeast Asia for both mining support work and heavy construction. The JS200 and JS210 LC models share a common undercarriage architecture that incorporates the track lower roller assembly compatible withKRA1717and 47758433 reference numbers, making this component a direct replacement across both the JCB and CASE‑Sumitomo platforms.

A JCB JS200 crawler excavator parts catalog references an undercarriage / track gear section that includes the bottom roller assembly, confirming the existence of a standardised undercarriage configuration across the JS200 model line. Additionally, track roller 331/42639 is listed as cross‑referenced to KRA10360, and machine compatibility includes JCB JS190, JS200, JS210 and JS220, further validating the broad applicability of these reference parts.

1.2 Comprehensive Part Number Cross‑Reference Table for Track Lower Roller Assembly

2. CQC TRACK: Professional OEM and ODM Manufacturer of Track Lower Roller Assemblies and Complete Chassis Components

CQC TRACK (cqctrack, Heli Machinery Manufacturing Co., Ltd.) , headquartered in Quanzhou, Fujian Province, China, is a professional manufacturer and supplier of OEM (Original Equipment Manufacturer) and ODM (Original Design Manufacturer) undercarriage components for medium‑to‑large crawler excavators, bulldozers, drilling rigs and crawler loaders. With over 20 years of specialised experience in chassis parts production, CQC has established itself as a trusted partner for international mining companies, heavy construction contractors, equipment rebuilders and aftermarket distributors across six continents.

CQC‘s OEM manufacturing capability means that every KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assembly is produced to exact dimensional, metallurgical and performance specifications that match or exceed the original brand equipment standards. For large mining fleets operating mixed‑brand equipment (SUMITOMO, CASE, JCB and LINK‑BELT excavators), this multi‑brand OEM capability allows single‑source procurement of track lower rollers, significantly simplifying inventory management and reducing supply chain complexity.

As an ODM manufacturer, CQC offers custom engineering and design services for customers who require track lower roller assemblies with modified specifications. These include:

• Increased flange height for enhanced lateral track guidance in soft‑ground mining conditions.
• Alternative Duo‑Cone seal materials for extreme‑temperature operations (e.g., Canadian oil sands or Siberian diamond mines).
• Enhanced case‑hardened depth (up to 12 mm @ HRC45) for extended service life in highly abrasive environments such as granite quarries or iron ore mines.
• Specialised bearing alloys (e.g., CuPb10Sn10 bronze bushings) for applications with unusually high shock loads or continuous high‑speed travel.

Customers can provide original equipment drawings, CAD models or physical samples, and CQC‘s in‑house engineering team will reverse‑engineer or redesign the track lower roller assembly to meet specific mine‑site operational requirements. All ODM projects are supported by CQC‘s vertically integrated manufacturing infrastructure, which eliminates subcontractor quality variability and enables fast prototyping and production lead times.

2.1 CQC Quality Certification: ISO 9001:2015 and Mining‑Grade Quality Assurance

CQC TRACK holds ISO 9001:2015 certification and operates under a formal China Quality Certification (CQC) approved quality management system. This certification regime ensures:

• Raw Material Traceability: Every batch of steel used in the production of KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies is chemically analysed using optical emission spectroscopy to confirm that the alloy composition meets defined standards—typically 40Mn2, 50Mn, 40Cr or 42CrMo grades. Third‑party reference sources confirm that track rollers and top rollers are generally manufactured from 40Mn2 steel, with the main process being forging followed by heat treatment.
• In‑Process Control: Hardness testing (Rockwell C scale) is conducted on roller shells, shafts and bearings at multiple stages of production. Industry standards for heat‑treated 40Cr steel achieve HRC50‑60 hardness. CQC‘s finished track lower rollers consistently achieve HRC52‑58 surface hardness with a case‑hardened depth of 8–12 mm at HRC45, which is recognised as the industry benchmark for mining‑grade components.
• 100% Pressure Testing: Each final assembly is subjected to 50 bar (approximately 725 psi) pressure testing for 30 minutes to ensure zero leakage from Duo‑Cone seals and bearing cavities. Reference industry standards for ISO 9001‑certified track roller manufacturing require precision machining with tolerances of ±0.05 mm for all critical mating surfaces.
• Final Product Validation: Every finished track lower roller assembly undergoes dimensional inspection using laser scanning equipment, break‑out torque verification for seal integrity, and non‑destructive testing (magnetic particle inspection) as applicable for high‑load components.

Each completed track lower roller assembly leaving CQC‘s factory is marked with a unique batch code linking it to the original steel heat number, forging lot, heat‑treatment cycle and final assembly shift. This level of traceability is mandatory for ISO 9001:2015 compliance and is specifically demanded by mining companies in Australia, Chile, Canada and South Africa before they approve a new aftermarket undercarriage supplier.

3. Mining‑Grade Technical Specifications: Engineered for Extreme Environments

3.1 Critical Load and Wear Specifications

The KRA1717 / KRA1251 / KRA1267 / KRA13750 / 47758433 track lower roller assemblies manufactured by CQC are designed to meet mining‑grade load and wear requirements that far exceed standard aftermarket specifications.

• Static Load Rating: Capable of withstanding up to 32,000 kg (approximately 70,547 lbs) per roller assembly, distributing the full operating weight of the excavator (typically 20–24 tons for SUMITOMO SH210 and CASE CX210 series) across multiple bottom rollers under each track frame.
• Dynamic Load Rating: Engineered to handle 18,500 kg (approximately 40,785 lbs) under continuous excavating and travelling conditions, including high‑torque turning forces and steep‑grade climbing.
• Temperature Range: Designed to operate reliably in -45°C to 130°C (-49°F to 266°F) , covering extreme cold‑climate mining (Arctic/Canadian oil sands) to high‑temperature desert mining (Atacama Desert, Chile and Middle Eastern sites).

Typical reference data for mining‑grade roller shells confirms surface hardness HRC52‑60 with hardened case depth of 8‑20 mm to ensure both strength and wear resistance. The bearing components are forged from 50Mn round steel with good oxidation resistance, and surface hardness of HRC52‑60 with case depth of 3‑6 mm for the bearing raceways provides excellent comprehensive performance.

3.2 Duo‑Cone Floating Seal Technology for Contamination Resistance

One of the most critical features of CQC‘s SUMITOMO / CASE / JCB track lower roller assemblies is the Duo‑Cone floating seal sealing system. Duo‑Cone seals, also known as floating oil seals, consist of two precision‑lapped metal rings and elastomer toric rings that form a robust, self‑aligning sealing system. This sealing technology is widely used in track rollers, carrier rollers, idlers and final drives, where high load, abrasive contaminants and continuous impact are present.

In mining environments where fine silica dust, sand, slurry and chemical contaminants are abundant, conventional lip seals fail rapidly. Duo‑Cone seals maintain lubricant integrity by:

• Preventing Lubricant Leakage: The dual‑ring metal sealing faces are lapped to extremely flat surfaces (typically 0.1 µm to 0.2 µm surface roughness), creating a near‑perfect seal even under high pressure.
• Blocking Contaminant Ingress: The metal faces maintain continuous contact through spring‑loaded elastomer toric rings, preventing abrasive particles from entering the bearing cavity.
• Enabling Self‑Alignment: Unlike rigid seals, Duo‑Cone seals can tolerate slight shaft misalignment and thermal expansion without losing sealing effectiveness.
• Operating in Extreme Temperatures: The sealing system is functional across the full -45°C to 130°C temperature range without significant degradation of sealing performance.

For each CQC track lower roller assembly, the Duo‑Cone seal faces are hardened to HRC65‑72, providing exceptional resistance to wear from hard particles that might otherwise breach the sealing interface. Lubricant (typically grade 40# gear oil or equivalent) is pre‑filled into the bearing cavity before final assembly sealing.

3.3 Forged Shell Construction vs. Cast Alternatives

A key differentiator between CQC‘s mining‑grade track lower rollers and general aftermarket components is the use of closed‑die forging rather than casting for the main roller shell.

For SUMITOMO SH210, CASE CX210 and JCB JS200 series excavators operating in mining and heavy quarry applications where cyclical impact forces are severe and service interruptions are extremely costly, CQC‘s forged track lower rollers offer a significantly higher return on investment compared to cast alternatives. Forging aligns the metallic grain flow with the contour of the roller shell, significantly enhancing fatigue resistance and impact toughness. The closed‑die forging process also eliminates porosity and internal voids that can cause premature failure in cast components under high stress.

All CQC track lower rollers are normalised using precision forging before overall heat treatment, achieving surface hardness of HRC52‑56 with a hardened layer depth exceeding 7‑10 mm at HRC45—exceeding the typical mining requirement of 4‑6 mm case depth.

4. Vertically Integrated Manufacturing Infrastructure: Complete Chassis Components Factory

CQC TRACK‘s ability to consistently deliver mining‑grade SUMITOMO / CASE / JCB track lower roller assemblies rests upon a fully vertically integrated manufacturing infrastructure that eliminates supply chain variability, quality inconsistencies and production delays associated with subcontracting.

Casting Foundry. Produces raw blanks for sprockets, idlers support rollers and certain track guide components using green‑sand and lost‑foam casting processes. Each casting batch undergoes ultrasonic flaw detection and chemical analysis to confirm alloy composition before proceeding to subsequent operations.

Forging Plant. The core facility for producing CQC‘s KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies. High‑tensile alloy steel billets (typically 40Mn2 or 40Cr grades) are heated to controlled austenitising temperatures (1,100–1,200°C) and shaped using hydraulic press forging. After forming, the forged shells are normalised to relieve internal stresses and prepare them for case hardening.

Forged Bucket Tooth Factory. Shares the same quality assurance protocols and alloy expertise as the track component lines. This facility enables CQC to supply a complete range of excavator wear parts, including bucket teeth and adapters for SUMITOMO, CASE, JCB, CATERPILLAR and HITACHI machines, alongside the undercarriage track lower roller assemblies.

CNC Machining Workshop. Equipped with CNC vertical lathes, horizontal boring mills and precision grinding centers. Critical finishing operations for KRA1717/KRA1251/KRA1267/KRA13750/47758433 assemblies include: precision turning of roller shell outer diameters to exact dimensions (±0.05 mm tolerance), finishing of flange geometries, precision boring of bearing cavities, grinding of shaft journals and final dimensional laser scanning for quality assurance.

Final Assembly Plant. The KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies are assembled on dedicated indexing lines using hydraulic pressing equipment calibrated to achieve precise bearing fit and shaft alignment. Dual‑cone or Duo‑Cone seals are installed with measured grease volumes (typically 100–150 ml per assembly), and each assembly undergoes:

• Rotational torque verification to ensure correct seal compression.
• Leak testing under 50 bar pressure (30 minutes minimum).
• Final visual inspection for surface finish and flange alignment.

By maintaining all five manufacturing nodes under unified management, CQC achieves end‑to‑end process control from raw steel receipt to finished track lower roller shipment. This vertical integration enables faster lead times (typically 15–20 working days for standard orders), superior quality consistency and the flexibility to accommodate ODM customisations without external dependency.

5. Global Mining and Construction Business – Proven Field Performance Across Continents

CQC‘s SUMITOMO / CASE / JCB KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies have accumulated over a decade of proven field service across the world‘s most demanding mining and heavy construction environments.

5.1 Mining and Quarrying Applications

5.2 Heavy Construction, Infrastructure and Earthmoving Applications

• NEOM mega‑project (Saudi Arabia): Thousands of hours of operation in fine desert sand conditions, where CQC‘s Duo‑Cone sealing system prevented sand ingress and maintained lubrication integrity.
• Trans‑desert highway construction (Mongolia): Extreme temperature swings from −30°C to +35°C within 24‑hour cycles; the forged shells demonstrated consistent dimensional stability and the sealing system prevented moisture ingress.
• Hydroelectric dam projects (Turkey and Brazil): Heavy clay and mud conditions—typically the most challenging environment for track seals—were handled effectively due to the Duo‑Cone seal design‘s ability to exclude sticky fines from bearing cavities.
• Southeast Asia infrastructure (Indonesia, Thailand, Philippines): Monsoon rain conditions, saturated clay soils and long travel distances between work zones; the assemblies demonstrated extended lubrication life and minimal seal maintenance requirements.

5.3 International Fleet Operator Field Data Summary

Independent field comparisons conducted by large international fleet operators (mining and heavy construction sectors) show that CQC‘s track lower rollers offer:

• Up to 30% longer service life than standard aftermarket components.
• Reduced unscheduled downtime by approximately 15–20% across mixed SUMITOMO/CASE/JCB fleets.
• Lower total cost of ownership with 20‑25% annual reduction in undercarriage parts expenditure.
• Near‑zero seal failure incidents during the first 1,500 hours of operation in normal to heavy conditions.

For mining fleets operating 20+ SUMITOMO SH210, CASE CX210 and JCB JS200 class excavators, the combined savings in parts cost, labour and lost production time can reach hundreds of thousands of dollars annually while simultaneously improving machine availability—a critical metric for high‑volume production environments.

6. International Business Team – Jack, Haily, Mr. Zhou

CQC TRACK‘s International Business Desk is staffed by experienced trade specialists who manage the complex logistics, documentation, technical support and customer‑specific requirements of global excavator parts supply.

• Jack – Senior Account Manager for Europe, Russia and the Americas.
  Jack has over 12 years of experience in heavy equipment parts export, including certified familiarity with CE marking (European Union), GOST‑R certification (Russia) and customs documentation for North American imports. He coordinates with CQC‘s in‑house logistics department to arrange sea freight (FCL/LCL), rail freight and express air shipments to ports and project sites across Europe, the Russian Federation, the United States, Canada and Latin America. Jack also handles technical proposal preparation and OEM/ODM contract negotiation for custom KRA1717/KRA1251/KRA1267/KRA13750/47758433 track lower roller configurations.
• Haily – Export Coordinator for Central Asia, South Korea and Australia.
  Haily specialises in the unique customs and certification requirements of Central Asian republics (Kazakhstan, Uzbekistan, Mongolia), South Korea and Australia. She manages the preparation of commercial invoices, packing lists, certificates of origin and test reports required for customs clearance in these jurisdictions. Haily works directly with Australian mining companies that require ISO 9001:2015 and CQC certification documentation as part of their supplier quality pre‑qualification process. Her strong relationships with freight forwarders at the Port of Brisbane, Port of Melbourne and Port of Busan ensure that CQC‘s track lower roller assemblies arrive on time even for time‑sensitive mining orders.
• Mr. Zhou – Regional Director for the Middle East, West Asia, Africa and Southeast Asia.
  Mr. Zhou has been with CQC for 15 years and speaks multiple languages (English, Mandarin and Levantine Arabic). He leads CQC‘s engagement with mining companies, government infrastructure agencies and equipment dealers across Saudi Arabia (NEOM and mining phosphate operations), UAE, Jordan, Turkey, Nigeria, Ghana (gold mines), Democratic Republic of Congo (cobalt and copper), Zambia (copper), Kenya, Indonesia, Thailand and the Philippines. Mr. Zhou also provides on‑site technical support missions, visiting mine sites to inspect worn undercarriage components, confirm part number exchanges and provide installation guidance for track lower roller assemblies when required.

7. Global Market Coverage – Supplying Mining and Construction Operations Across Six Continents

CQC‘s KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies and complete chassis components portfolio are currently shipped to major mining and construction markets worldwide:

• Europe – Germany, Poland, Finland, Sweden, Norway, the Netherlands, Belgium, France, Spain, Italy, Greece, United Kingdom. European customers particularly value CQC‘s CE compliance documentation and Type Approval certificates where required.
• West Asia and the Middle East – Saudi Arabia (NEOM project, phosphate mining), United Arab Emirates (Dubai and Abu Dhabi infrastructure), Qatar, Jordan (potash and phosphate mines), Turkey (aggregate quarries and hydroelectric projects), Kuwait (oilfield service).
• Central Asia – Kazakhstan (Karaganda and Pavlodar mining regions), Uzbekistan (gold and copper mines), Mongolia (Oyu Tolgoi copper‑gold mine), Tajikistan via the Dostyk–Alashankou rail corridor.
• South America – Chile (Atacama Desert copper mines), Peru (copper and zinc mines), Brazil (iron ore and gold mines), Argentina, Colombia, Bolivia.
• Russia – Siberian diamond and coal mines, Urals region mining and Far Eastern ports (Vladivostok), distributed inland via Trans‑Siberian Railway. All shipments include GOST certification statements where applicable.
• South Korea – A significant portion of CQC‘s Asian export volume goes to South Korea, supplying equipment dealers, rebuild shops and direct fleet accounts in Seoul, Incheon, Busan and Ulsan.
• North America – United States and Canada, supplying aftermarket distributors, equipment rebuild centres and large‑scale infrastructure contractors working on highway, bridge and pipeline projects. CQC‘s ISO 9001:2015 and CQC certification documentation satisfy most North American buyer quality requirements.
• Australia – Western Australia (iron ore), Queensland (coal and copper), New South Wales and Victoria (infrastructure and construction). Australian customers require detailed material certifications (mill certificates, heat treatment records and hardness test reports) for each batch of track lower roller assemblies, and CQC‘s traceability system provides these documents routinely.
• Africa – South Africa (platinum, gold, manganese and chrome mines), Zambia (copper), Democratic Republic of Congo (cobalt and copper), Ghana (gold), Nigeria (infrastructure), Kenya (road and rail projects), Tanzania and Angola.

8. Conclusion – CQC TRACK: Your Global Chassis Components Factory and Manufacturer for SUMITOMO CASE JCB Track Lower Roller Assemblies

For fleet managers, equipment dealers, mining procurement teams and infrastructure contractors seeking a reliable source of SUMITOMO / CASE / JCB KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 Track Lower Roller Assemblies, CQC TRACK (cqctrack) offers a complete, vertically integrated manufacturing solution backed by 20+ years of specialised undercarriage expertise.

CQC TRACK combines:

• Vertically integrated manufacturing infrastructure – casting foundry, forging plant, forged bucket tooth factory, CNC machining workshop and final assembly plant.
• OEM and ODM manufacturing capabilities – supporting SUMITOMO SH200/SH210, CASE CX210/CX240 and JCB JS200/JS210 LC series excavators.
• International quality certifications – ISO 9001:2015 and CQC approved quality management system.
• Mining‑grade metallurgy – forged 40Mn2/40Cr steel shells, Duo‑Cone floating seals, case hardening to HRC52‑58 with 8–12 mm hardened case depth.
• Proven field performance – 3,000+ hours service life in mining conditions, 30% longer life than standard aftermarket components.
• Dedicated international business team – Jack, Haily and Mr. Zhou for global sales, logistics and technical support.
• Worldwide shipping – Exporting to Europe, West Asia, Central Asia, South America, Russia, South Korea, North America, Australia and Africa, covering all major mining and construction markets.

Contact CQC TRACK directly for:

• Factory‑direct supply of SUMITOMO / CASE / JCB KRA1717, KRA1251, KRA1267, KRA13750 and 47758433 track lower roller assemblies.
• OEM and ODM undercarriage manufacturing for mixed fleets (SUMITOMO, CASE, JCB, LINK‑BELT, CATERPILLAR, KOMATSU, HITACHI and other brands).
• Technical support, part number cross‑referencing and installation guidance.
• Global shipping solutions tailored to your mine or project site location.

CQC TRACK – Engineering Mining‑Grade Reliability into Every Track Lower Roller Assembly.