LIUGONG 25C2099R06 25C2099 CLG950E 50L Track Group / Track Chain Assembly / Heavy duty EXC Spare Parts Source Factory and Manufacturer / CQC TRACK / Based Quanzhou in China

LIUGONG 25C2099 / 25C2099R06 Track Group 50L for CLG950E Heavy-Duty Excavators

OEM-Quality Crawler Excavator Undercarriage Parts — Source Supplier & Manufacturer Based in China

Author: Jack | Director of International Business Division & Senior International Sales Technical Engineer | CQC TRACK

Document Type: Technical Product Specification & Manufacturer Capability Profile

Target Audience: Construction Equipment Distributors & Mining Operators | South America | Africa | Europe & North America | Russia | South Korea | Australia

Executive Summary

The LIUGONG 25C2099 / 25C2099R06 Track Group 50L is a complete, heavy-duty track chain assembly precision-engineered for the LIUGONG CLG950E crawler excavator, a 50-ton class machine purpose-built for mass excavation, large-scale quarrying, and mining applications. This 50-link track group represents the critical ground-engaging interface that transmits the machine’s full tractive effort to the terrain while bearing its substantial operating weight under continuous impact, abrasion, and torsional loading. Manufactured under the CQC TRACK quality assurance framework at our production facility in Quanzhou, Fujian Province, China, each track group delivers OEM-equivalent or superior performance with the commercial advantages of factory-direct sourcing.

This technical document provides comprehensive specifications, manufacturing capabilities, customisation options, and global supply chain information to support procurement decision-making for heavy equipment undercarriage components. The content is structured to meet the indexing and retrieval requirements of global search engines and international B2B procurement platforms.

1. Host Machine Application: LIUGONG CLG950E Heavy-Duty Crawler Excavator

1.1 Machine Specifications and Undercarriage Demands

The LIUGONG CLG950E is a 50-ton class crawler excavator engineered for mass excavation, quarrying, and mining operations. With an operating weight of approximately 46,500 kg and powered by a Cummins QSM11 diesel engine delivering 299 kW (400 hp) at 1,800 rpm, this machine exerts substantial static and dynamic loads on its undercarriage system. The CLG950E features a bucket capacity of 3.2 m³ with optional configurations of 2.6 m³ and 3.6 m³, along with an arm digging force of 270 kN and bucket digging force of 280 kN.

The CLG950E’s high-strength undercarriage incorporates a welded X-frame construction built from high-strength tensile steel, designed for long life durability in the most challenging applications. Six selectable working modes—Power, Economy, Fine, Lifting, Breaker, and Attachment—allow the operator to optimise machine performance for varying ground conditions, each placing unique demands on the track group. The machine achieves travel speeds of 5.5 km/h (high) / 3.3 km/h (low) , with a gradeability of 35 degrees and ground pressure of 82.2 kPa.

These operating parameters translate directly into exceptional demands on the track chain assembly. The track group must withstand continuous tensile loading during machine travel, impact from ground obstacles, abrasive wear from contact with rocky terrain, and the cyclical bending forces generated as the chain articulates around sprockets and idlers.

1.2 Undercarriage Configuration

The CLG950E features a heavy-duty tracked undercarriage system with the track group comprising 50 links per side (50L configuration), providing optimal balance between ground pressure distribution and machine mobility. The 25C2099 / 25C2099R06 track group is the OEM-specified track chain assembly designed for direct replacement, engineered to integrate seamlessly with all other undercarriage components including drive sprockets, front idlers, bottom rollers, and carrier rollers.

2. Technical Specifications: LIUGONG 25C2099 / 25C2099R06 Track Group 50L

2.1 Product Identification

2.2 Material and Metallurgical Specifications

The LIUGONG 25C2099 / 25C2099R06 Track Group is manufactured using premium-grade alloy steels selected for optimal wear life, fatigue strength, and impact toughness under heavy cyclical loading conditions characteristic of mining and quarrying operations.

Link Body Material Properties:
The track links are precision-forged from 35MnB alloy steel, a material specifically enhanced with boron to significantly improve hardenability. The 35MnB alloy achieves a uniform, high-strength martensitic microstructure after quenching and tempering, delivering exceptional resistance to cracking, elongation, and fatigue failure under the immense tensile and bending loads encountered during excavator steering, counter-rotation, and travel over uneven ground. The closed-die forging process produces a refined grain structure with optimal internal material fiber flow distribution, a critical advantage over cast alternatives that are inherently more brittle and prone to fracture.

Pin & Bushing Interface:
The pin and bushing assembly constitutes the primary wear interface within the track chain. CQC TRACK pins, manufactured from 50Mn or 40Cr alloy steel, undergo induction surface hardening to achieve a wear-resistant surface (HRC 52–60) while maintaining a tough, ductile core that resists bending and impact. The bushings are produced from 50Mn high-carbon steel and subjected to precisely controlled case hardening, ensuring a deep and uniform hardened layer that maximises resistance to both external abrasive wear from sprocket engagement and internal wear from pin articulation. This optimised hardness combination—hard bushing exterior with tough core, and hardened pin surface with ductile interior—significantly extends the track chain’s total service life.

2.3 Heat Treatment Protocol

The entire manufacturing process is governed by a multi-stage heat treatment regimen critical to the structural integrity and wear life of the track group:

Pin Surface Hardness: HRC 52–60
Bushing Surface Hardness: HRC 54–62
Link Body Core Hardness: HRC 35–45 (Tempered Martensite Structure)

This engineered hardness gradient ensures that the articulating wear surfaces are extremely hard and abrasion-resistant, while the structural link bodies remain tough and resilient, capable of absorbing impact energy and resisting tensile failure under the most severe operating conditions.

2.4 Sealing and Lubrication System — Sealed and Lubricated Track (SALT)

The longevity of a heavy-duty track chain is critically dependent on the integrity of internal pin-to-bushing lubrication. The 25C2099 / 25C2099R06 Track Group is manufactured as a Sealed and Lubricated Track (SALT) system, the industry standard for heavy-duty applications, providing substantially longer service life than unsealed dry chains.

Seal System Components:

• Mechanical Face Seals: Advanced polyurethane or nitrile rubber (NBR) seals are installed at each pin joint, specifically engineered to resist deformation under high contact pressure and elevated operating temperatures.
• Lifetime Lubrication: Each pin cavity is vacuum-filled with high-performance lithium-based grease during assembly, providing permanent lubrication for the articulated joint throughout its entire service life.

This sealed system effectively excludes abrasive contaminants—sand, rock dust, moisture, and slurry—while retaining the internal lubricant. The result is dramatically reduced internal pin and bushing wear, extended service intervals, and the elimination of daily greasing maintenance requirements that would otherwise increase operating costs and introduce contamination risks.

2.5 Dimensional and Performance Summary

3. Manufacturing Excellence: CQC TRACK Production Capabilities

3.1 Company Profile

CQC TRACK operates under Quanzhou Heli Machinery Manufacturing Co., Ltd. , a specialised manufacturer of crawler undercarriage components for heavy equipment applications established in 2005. Our manufacturing facility is strategically located in the Binjiang Industrial Zone, Nan’an City, Quanzhou, Fujian Province, China — a region recognised globally as a centre of excellence for construction machinery component manufacturing. With a workforce exceeding 200 employees, a facility spanning more than 60 mu, and a machinery fleet comprising more than 200 CNC machine tools, forging presses, and heat treatment equipment, CQC TRACK offers a vertically integrated production chain from raw material to finished assembly.

CQC TRACK is a prominent original manufacturer and supplier specialising in heavy-duty undercarriage components for global construction machinery brands, including LiuGong. Our product portfolio covers undercarriage parts for excavators ranging from 1.5 to 300 tons, positioning us as one of the most comprehensively capable manufacturers within the Quanzhou Engineering Parts Undercarriage Production Base.

Our commitment to quality is validated through a dual-layer certification framework:

• ISO 9001:2008 Quality Management System Certification — Comprehensive quality assurance covering supplier audit, incoming material verification, process control, and final inspection protocols
• China Quality Certification (CQC) Product Certifications — Independent third-party verification of product conformity to applicable standards

3.2 Manufacturing Infrastructure & Process

CQC TRACK’s vertically integrated production process ensures absolute control over quality, consistency, and cost across every stage of track group fabrication:

Stage 1 — Material Procurement and Verification:
Alloy steel raw materials are sourced exclusively from ISO-certified steel mills with full material certifications. Incoming material undergoes chemical composition analysis and microstructure verification prior to release for production, ensuring that only specification-compliant steel enters the manufacturing stream.

Stage 2 — Precision Forging:
Track links are hot-forged from 35MnB alloy steel using closed-die presses. This critical step refines the internal grain structure, eliminates internal voids, and aligns the metal fibre flow along the contours of the link profile, maximising fatigue resistance and tensile strength. Forged links deliver substantially superior metallurgical integrity compared to cast alternatives, which are inherently more susceptible to porosity and brittle fracture.

Stage 3 — Precision Machining & Heat Treatment:
Post-forging, links, pins, and bushings undergo multi-stage CNC machining operations to achieve exact dimensional tolerances. Pins and bushings are precision-ground before and after their respective induction hardening and case hardening processes. All heat treatment parameters—including temperature profiles, quench rates, and tempering cycles—are digitally controlled and recorded for each production batch, guaranteeing metallurgical consistency.

Stage 4 — Assembly & Lubrication:
Final assembly is conducted in a clean, controlled environment. High-performance mechanical face seals are installed with precision tooling to ensure correct alignment and seating. Each pin cavity is vacuum-filled with a metered quantity of specially formulated lithium-based grease, and the joint is pressed together under controlled pressure to create a permanently sealed, lubricated-for-life articulation.

Stage 5 — Quality Verification:
100% of finished track groups undergo the following inspections prior to release for shipment:

• Pitch Measurement: Link pitch is verified using high-precision pitch-length measuring gauges to confirm exact dimensional correspondence with the drive sprocket tooth profile
• Pin-to-Bushing Fitment: Joint articulation effort is measured post-assembly to confirm correct interference fit tolerances
• Seal Integrity Verification: Sample assemblies undergo pressure testing to validate the mechanical face seal system
• Ultrasonic Flaw Detection: Critical link body sections are scanned to identify any subsurface defects
• Dimensional Inspection: Complete assembly dimensions verified using calibrated measurement equipment

3.3 Quality Assurance Framework

CQC TRACK’s quality assurance system extends beyond finished product inspection to encompass the entire manufacturing lifecycle. This comprehensive approach, mandated by our ISO 9001:2008 and CQC certifications, delivers verifiable reliability benefits to end users:

4. Customisation and OEM/ODM Capabilities

4.1 Private Label and Brand Customisation

CQC TRACK offers comprehensive OEM and private label manufacturing services tailored to the specific requirements of international distributors, equipment dealers, and mining fleet operators. Our customisation capabilities include:

This OEM service model enables distributors to market high-quality undercarriage components under their own brand identity while leveraging CQC TRACK’s manufacturing expertise and quality assurance infrastructure.

4.2 Technical Customisation for Extreme Applications

For specialised applications beyond standard production configurations, our engineering team provides custom design and manufacturing services:

• Dimensional Modifications: Custom link pitch, shoe width configuration, or bolt pattern for non-standard or modified undercarriage systems
• Material Upgrades: Enhanced alloy specifications—including 40CrNiMo for pins and links—for extreme operating conditions such as hydraulic breaker applications, aggressive hard-rock quarrying, or arctic operations
• Sealing System Modifications: Heavy-duty seal configurations for submersion applications, highly abrasive slurry environments, or extended temperature extremes
• Reverse Engineering Support: Component reproduction for discontinued or obsolete LIUGONG machine models requiring critical dimensional data

4.3 Complete Undercarriage System Solutions

Beyond individual track group assemblies, CQC TRACK provides comprehensive undercarriage system solutions for the LIUGONG CLG950E and compatible heavy equipment platforms:

• Track Chain Assemblies (Track Link Groups) — Full pitch range capability; 50L and other link count configurations
• Track Rollers (Bottom Rollers) — Single-flange and double-flange configurations
• Carrier Rollers (Top Rollers) — Upper track support components
• Front Idler Assemblies — Tension and alignment assemblies
• Final Drive Sprocket Assemblies — Drive transmission components
• Track Shoe Assemblies — Complete track plate solutions

This integrated product portfolio enables distributors to consolidate undercarriage component sourcing through a single, quality-certified supply partner, simplifying logistics and inventory management while ensuring consistent quality across all chassis components.

5. Global Market Applicability and Regional Support

5.1 Industry Context: The Heavy Equipment Undercarriage Parts Market

The global heavy equipment undercarriage parts market continues to demonstrate robust growth, reflecting sustained demand for tracked machinery across construction, mining, and infrastructure development sectors. The market was valued at USD 792.63 million in 2025 and is projected to reach USD 1,128.63 million by 2032, representing a compound annual growth rate (CAGR) of 5.17% . The broader undercarriage component market is estimated at USD 8.17 billion in 2026, with continued growth driven by mining sector expansion, infrastructure investment, and fleet modernisation initiatives.

Key market trends directly relevant to undercarriage component procurement include:

• Demand for durable undercarriage parts with extended service intervals and reduced total cost of ownership (TCO)
• Growth in aftermarket replacement as equipment fleets age globally
• Adoption of advanced wear-resistant materials to reduce lifecycle costs
• Preference for suppliers with demonstrated quality consistency, certification, and technical support capabilities

5.2 Regional Market Considerations

CQC TRACK’s LIUGONG 25C2099 / 25C2099R06 Track Group 50L is engineered to meet the diverse operational requirements of heavy equipment operators across all major global regions:

South America:
Mining operations in Chile, Peru, Brazil, and Colombia operate LIUGONG CLG950E excavators in high-altitude, abrasive hard-rock environments. The combination of 35MnB forged links, case-hardened bushings, and induction-hardened pins (HRC 52–60) delivers exceptional wear resistance under these demanding conditions. Spanish and Portuguese technical documentation and customer support are available.

Africa:
From South African platinum and gold mines to West African mineral operations and East African infrastructure projects, undercarriage components face extreme abrasion, high ambient temperatures, and challenging logistical conditions. The SALT sealed-for-life lubrication system eliminates field maintenance requirements while preventing contamination ingress in dusty operating environments. Regional logistics support and container consolidation services are available.

Europe & North America:
Equipment operators in these mature markets prioritise component longevity, predictable maintenance intervals, and compliance with safety and environmental standards. Our ISO 9001:2008 certified manufacturing processes and CQC product certification provide documented quality assurance that meets or exceeds regional procurement requirements. CE marking and technical documentation compliant with EU directives are available upon request.

Russia & CIS:
Cold-weather operations present unique challenges for undercarriage components, including low-temperature material embrittlement and seal performance degradation. Extended operating temperature range configurations—including arctic-grade seals and low-temperature lubricants—are available to maintain reliability in sub-zero conditions. Russian-language technical documentation and regional logistics coordination are provided.

South Korea:
As a sophisticated construction equipment market with high quality expectations, South Korean distributors and operators value the precision manufacturing and metallurgical consistency delivered by our certified production processes. Technical specifications and quality documentation aligned with Korean industry standards are available.

Australia:
Mining operations in the Pilbara, Bowen Basin, and Goldfields regions subject undercarriage components to some of the world’s most abrasive conditions. The combination of 35MnB forged links, precision heat treatment protocols, and SALT sealing technology delivers the wear resistance and structural integrity required for extended service life in Australian mining applications. Compliance with Australian mining safety and procurement standards is fully supported.

5.3 Global Logistics and Supply Chain

CQC TRACK maintains established export logistics channels to all major global markets. Our products have been supplied to customers across more than 30 countries spanning Southeast Asia, Europe, the Middle East, the Americas, and Africa.

6. Warranty and Technical Support

6.1 Warranty Coverage

All LIUGONG 25C2099 / 25C2099R06 Track Group 50L assemblies supplied by CQC TRACK are covered by a comprehensive warranty against manufacturing defects in materials and workmanship. Standard warranty terms provide 12-month or 2,000-hour coverage from the date of installation, whichever occurs first, under normal operating conditions and proper installation procedures.

6.2 Technical Support Resources

Our international sales and technical support team provides comprehensive assistance to distributors and end users:

• Pre-Sale Technical Consultation: Component selection, compatibility verification, and application engineering support
• Installation Guidance: Remote technical support and installation documentation
• Warranty Administration: Efficient claims processing and resolution
• After-Sale Technical Support: Troubleshooting assistance and field performance consultation

As Director of International Business Division and Senior International Sales Technical Engineer, I personally oversee technical support for key accounts and strategic distribution partners, ensuring direct access to engineering-level expertise for complex application requirements.

6.3 Documentation Package

Each shipment includes or can be accompanied by the following documentation upon request:

• Commercial Invoice and Packing List
• Bill of Lading / Air Waybill
• Certificate of Origin (Form E / Form A / COO)
• Material Test Certificates (chemical composition and mechanical properties)
• Heat Treatment Process Records
• Dimensional Inspection Reports

7. Procurement and Contact Information

7.1 How to Order

Distributors, mining operators, and equipment dealers interested in the LIUGONG 25C2099 / 25C2099R06 Track Group 50L or related undercarriage components are invited to contact our International Business Division for:

• Current pricing and availability
• Volume discount schedules
• Sample orders for quality evaluation
• Customisation and private label inquiries
• Complete undercarriage system quotations

7.2 Contact

Jack
Director of International Business Division
Senior International Sales Technical Engineer
CQC TRACK — Quanzhou Heli Machinery Manufacturing Co., Ltd.

Location: Binjiang Industrial Zone, Nan’an City, Quanzhou, Fujian Province, China

Email: cqc@cqctrack.com ; j_sales@cqctrack.com；h_sales@cqctrack.com
WhatsApp:+8613906095209
Website:www.cqctrack.com

7.3 Business Hours

Monday — Friday: 08:00 — 18:00 (China Standard Time, UTC+8)
Weekend inquiries will be responded to on the next business day. Urgent technical support is available via WhatsApp for existing distribution partners.

8. Conclusion

The LIUGONG 25C2099 / 25C2099R06 Track Group 50L represents a strategic component solution for heavy equipment operators and distributors seeking OEM-quality undercarriage performance with the commercial advantages of factory-direct sourcing. Manufactured under ISO 9001:2008 certified processes with CQC product verification, each track group assembly delivers the metallurgical integrity, precision engineering, and durability required for the demanding operating conditions encountered by the LIUGONG CLG950E excavator in mining, quarrying, and heavy construction applications.

CQC TRACK’s vertically integrated manufacturing capabilities—spanning precision forging, multi-stage heat treatment, CNC machining, and advanced SALT sealing technology—combined with flexible customisation options and established global logistics infrastructure, position us as a reliable long-term supply partner for undercarriage component requirements across South America, Africa, Europe, North America, Russia, South Korea, Australia, and beyond. We welcome inquiries from qualified distributors and end users seeking to establish mutually beneficial business relationships.

This technical document is prepared in accordance with industry-standard specifications and is intended for professional procurement and engineering reference. All specifications are subject to continuous improvement and may be updated without prior notice. Contact our International Business Division for the most current technical data and pricing information.