DOOSAN DX200A / DX225LCA / S200 / S220 / S225LC 20010300006 / 20010300154 / 20010300153 / 20010300073 Track Link Assembly – 45L / 49L 190mm Pitch – Crawler Excavator Spare Parts Manufacturer: CQC TRACK

1. Precision Undercarriage Engineering: DOOSAN Track Link Assembly for Medium-to-Large Crawler Excavators

The track link assembly (also referred to as track chain assembly or track chain group) is the structural backbone of any crawler excavator’s propulsion and load‑bearing system. For DOOSAN mid‑range to larger excavator models—including the DX200A, DX225LCA, S200, S220, and S225LC—the undercarriage must withstand continuous high‑impact loads, abrasive terrain, and severe torsional stresses.

The DOOSAN track link assembly covered by the original OEM part numbers 20010300006, 20010300154, 20010300153, and 20010300073 is manufactured to precise original‑equipment dimensions and mechanical properties. These part numbers correspond to slightly different link versions, bushing configurations, and sealing arrangements across the DX and S series model families.

A defining specification for the DX225LC series undercarriage is the 190 mm link pitch, which is the standard pitch adopted for DOOSAN’s 20–25 ton class crawler excavators. A 190 mm pitch provides an optimal balance between ground contact length, weight distribution, and chain articulation durability under both high‑torque digging cycles and high‑speed travel positioning.

In addition to the 190 mm pitch dimension, the DOOSAN track link assemblies are offered in two common link‑count configurations: 45 links (45L) and 49 links (49L) . The 45L configuration is typically specified for standard track shoe lengths on the S200 and DX200A series, while the 49L configuration is used on longer‑wheelbase chassis such as the S225LC and DX225LCA, where additional link count increases track‑on‑ground length for lower ground pressure and better flotation in soft or muddy worksites.

Both the 45L and 49L assemblies share the identical 190 mm pitch and use same‑diameter bushings and pins, allowing mixed‑fleet operators to standardize replacement parts across multiple DOOSAN models while matching the original track‑chain length required for each specific chassis.

The 20010300006 / 20010300154 and 20010300153 / 20010300073 number pairs reflect design evolution and minor improvements in bushing metallurgy, seal design, and interference‑fit tolerances. The 20010300006 and 20010300154 versions generally correspond to earlier production DX200A and S220 S‑series machines, whereas 20010300153 and 20010300073 represent later, enhanced iterations with deeper case‑hardened bushings and upgraded lubricated‑seal cartridges that reduce maintenance frequency in high‑hour mining applications.

From a mechanical engineering standpoint, the DOOSAN track link assembly must endure three primary failure modes: bushing rotational wear (caused by pin‑to‑bushing articulation), link rail abrasion (caused by track roller flange contact), and pin migration / chain elongation (caused by axial thrust loads during steering). High‑quality replacement assemblies must therefore exhibit four key characteristics:

• Precision forging of link bodies using high‑tensile alloy steel to resist bending and fatigue cracking.
• Deep case‑hardened bushings (typically 3 mm–5 mm effective case depth, 55+ HRC surface hardness) to slow down rotational wear.
• Induction‑hardened rail surfaces on the link top and bottom to maintain proper roller‑path geometry.
• Advanced grease seals such as Duo‑Cone or multi‑labyrinth designs to retain lubricant inside the pin‑bushing interface while blocking abrasive contaminants like rock dust, sand, and slurry.

A third‑party aftermarket track link assembly that meets or exceeds DOOSAN’s original specifications must replicate all of these features while offering 100% interchangeability without any chassis modification.

2. CQC TRACK: A Professional OEM / ODM Manufacturer of Track Link Assemblies and Complete Undercarriage Systems

CQC TRACK (Heli Machinery Manufacturing Co., Ltd.) , based in Quanzhou City, 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 tracked excavators, bulldozers, drilling rigs, and crawler loaders. The company operates as both a source factory and a technical engineering partner for global distributors, fleet owners, and equipment rebuilders.

CQC TRACK’s manufacturing philosophy integrates three core pillars: vertical production integration, metallurgical expertise, and international quality certification.

The company holds ISO 9001:2015 certification and operates under the CQC (China Quality Certification) framework, which mandates consistent quality control, traceable material sourcing, and documented inspection procedures for every production batch. For international customers, CQC certification provides verifiable evidence that each track link assembly has been manufactured to a recognized quality management system, eliminating variability often associated with fragmented supply chains.

As an OEM supplier, CQC TRACK produces track link assemblies that exactly match the dimensions, hardness profiles, and sealing configurations of the original DOOSAN parts. This means that replacement track chains can be installed alongside remaining original‑equipment undercarriage components without any fitting issues.

As an ODM manufacturer, CQC TRACK offers design and engineering services for customers who require custom track link specifications—such as increased link height for deeper wear allowance, modified bushing clearance for extreme‑temperature environments, or alternative seal types for specific mining conditions. Customers can supply drawings or physical samples, and CQC TRACK’s technical team will reverse‑engineer or re‑design the track link assembly to meet unique operational requirements.

One of the key advantages of CQC TRACK is its independence from single‑brand licensing. Because the company is an independent professional manufacturer, it can supply track link assemblies for virtually all major excavator brands, including DOOSAN, Develon (formerly DOOSAN), DAEWOO, Caterpillar, Komatsu, Hitachi, Hyundai, Kobelco, Sumitomo, VOLVO, Liebherr, CASE, John Deere, and JCB. This broader OEM/ODM capability benefits fleet operators who run mixed‑brand equipment and want to consolidate undercarriage sourcing through a single, reliable partner.

The company’s OEM and ODM track link assembly portfolio covers pitch sizes from 140 mm up to 260 mm, accommodating everything from mini‑excavators to 100‑ton mining excavators. Specific to DOOSAN’s 20–25 ton class, CQC manufactures the 190 mm pitch track link assemblies in both 45‑link and 49‑link configurations, fully interchangeable with OEM part numbers 20010300006, 20010300154, 20010300153, and 20010300073.

All CQC track links are produced using closed‑die forging from high‑alloy chrome‑molybdenum or manganese‑boron steel, followed by controlled heat treatment (quenching + tempering) to achieve a martensitic microstructure that combines high surface hardness and impact‑resistant core toughness.

Each finished track link assembly undergoes dimensional verification using laser scanning tools and hardness testing (Rockwell or Vickers) on all critical wear zones, including the bushing outer diameter, the pin surface, and the rail contact surfaces.

The pin‑and‑bushing interface in a CQC track chain is assembled with a precise interference fit, preventing axial movement and eliminating pin migration. Duo‑Cone lubricated seal rings are fitted at each joint to encapsulate long‑life grease and to keep out moisture and debris. When measured under standard test conditions, CQC’s 190 mm pitch track link assemblies demonstrate bushing wear rates that are comparable to or better than the original OEM components, translating to 30% longer service life than typical generic aftermarket track chains.

3. World‑Class Manufacturing Infrastructure: Foundry, Forging Plant, Bucket Tooth Forging Shop, Assembly Factory, and Machining Workshop

CQC TRACK’s manufacturing capabilities rest on a fully vertically integrated infrastructure that eliminates the quality risks and supply delays associated with outsourced production.

3.1 Casting Foundry.
The foundry produces raw blanks for sprockets, idlers, support rollers, and certain track guide components. Lost‑foam and green‑sand casting processes are employed to produce near‑net‑shaped parts with consistent wall thickness and minimal internal porosity. Each casting lot undergoes ultrasonic flaw detection and chemical analysis to confirm alloy composition before moving to subsequent machining operations.

3.2 Forging Plant.
The forging plant is the heart of CQC’s track link production. High‑tensile steel billets are heated to controlled austenitizing temperatures and shaped using closed‑die hammer forging or hydraulic press forging. Closed‑die forging aligns the metallic grain flow with the contour of the link body, significantly increasing fatigue life compared to cast or cut‑from‑plate alternatives. After forging, links are air‑cooled or oil‑quenched depending on the alloy type, then tempered to relieve internal stress.

The forging plant also produces track pins, retainers, and other high‑strength fasteners, all forged from the same quality‑controlled steel batches to ensure consistent mechanical properties across every component in a complete track chain assembly.

3.3 Forged Bucket Tooth Factory.
As an extension of CQC’s ODM service, the dedicated forged bucket tooth shop produces excavator bucket teeth and adapters for DOOSAN, Caterpillar, Komatsu, Hitachi, and other makes. Buckets teeth are manufactured from high‑manganese or chromium‑iron alloys, with controlled heat treatment that produces a tough, wear‑resistant surface and a ductile core that resists breakage under impact. This facility shares the same quality assurance protocols as the track link assembly lines, ensuring that CQC can supply a complete wear‑parts package—track chains, track shoes, sprockets, rollers, idlers, and bucket teeth—from a single source.

3.4 Final Assembly Plant.
The assembly plant is where individual track links, pins, bushings, and seals come together as complete track chain assemblies (track link assemblies) . Assembly is performed on dedicated indexing lines using hydraulic pressing equipment calibrated to achieve the exact interference fit specified for each pitch size.

For lubricated track chains (the industry standard for medium‑to‑large excavators), Duo‑Cone seals and precision‑measured grease volumes are installed at every pin‑bushing joint. The assembly process also includes:

• Joint break‑out torque verification to confirm proper seal compression.
• Chain elongation measurement across multiple pitches to detect any deviation from dimensional standards.
• Leak testing of lubricated joints under simulated working pressure.

After final assembly, each track link assembly is tagged with a unique batch code that references the manufacturing date, material heat number, and QC test results, ensuring full traceability from raw steel to finished product.

3.5 CNC Machining Workshop.
The machining workshop is equipped with CNC vertical lathes, horizontal boring mills, gear hobbing machines, and precision grinding centers. Key operations performed in the machine shop include:

• Final sizing of link rail surfaces to achieve flatness and parallelism within 0.05 mm.
• Drilling and reaming of bolt holes for track shoe attachment.
• Machining of idler journals and sprocket mounting flanges.
• Grinding of bushing outer diameters to the exact tolerance required for smooth roller contact.

By keeping all five manufacturing nodes under one management structure, CQC TRACK maintains process control from molten steel to finished track chain, allowing faster production lead times and far greater quality consistency than competitors that rely on subcontractors.

4. Decades of Field Proven Reliability: Mining, Quarrying, and Heavy Construction Applications

CQC TRACK’s DOOSAN track link assemblies have accumulated over 10 years of continuous field service in some of the world’s most demanding environments, including open‑pit mines, underground excavations, large‑scale infrastructure projects, quarry operations, pipeline construction, and forestry applications.

Field performance data collected from fleet operators in Chile (copper mining), Australia (iron ore and coal mining), Russia (diamond and gold mines), South Africa (platinum and chrome mines), and Canada (oil sands and hard‑rock mining) consistently demonstrate that CQC 190 mm pitch track link assemblies deliver the following reliability metrics:

• Bushing wear life: 2,500–3,500 hours before reaching 3% chain elongation, depending on abrasiveness of ground conditions.
• Pin migration resistance: No measurable pin movement even after 2,000 hours of operation in high‑torque steep‑grade applications.
• Seal integrity failure rate: Less than 1% within the first 1,500 hours, measured in lubricated track chain installations.
• Link breakage / fatigue failure: Virtually zero instances when track tension is maintained within OEM‑specified range.

In quarry operations with highly abrasive crushed stone and poor load‑spreading conditions, CQC’s case‑hardened bushings (55 HRC minimum surface hardness) show wear rates 30% lower than generic aftermarket track links, directly reducing the frequency of costly “re‑bushing and pin‑turn” rebuilds.

In mining applications where excavators operate 20 hours per day, six days per week, the extended service life of CQC track links translates directly into increased machine availability and lower cost per ton moved. Mine maintenance directors at several Chilean copper mines have reported that switching from lower‑grade aftermarket track chains to CQC 190 mm pitch assemblies reduced unscheduled downtime by approximately 15% and lowered annual undercarriage parts expenditure by 20–25% while maintaining the same replacement interval.

Infrastructure contractors in Southeast Asia and West Africa, where heavy monsoon rains create mud, clay, and slurry conditions that are notoriously hard on track seals, have also validated the effectiveness of CQC’s Duo‑Cone sealing system. The seal rings maintain grease retention even after hundreds of hours of immersion in abrasive slurry, preventing bushing “dry running” that would otherwise lead to rapid chain failure.

These field results are not based on laboratory simulations alone—they are the product of decades of continuous improvement driven by direct feedback from mining companies, construction contractors, and equipment rebuilders. CQC TRACK’s engineering team regularly revisits design parameters (case hardening depth, press‑fit tonnage, seal groove geometry) based on wear patterns observed in returned cores and field‑returned components, ensuring that each successive batch of DOOSAN track link assemblies performs better than the previous one.

5. Certified Quality: CQC Certification, ISO 9001:2015, and Rigorous In‑Process Inspection

One of the primary reasons that CQC TRACK has gained the trust of international mining houses and construction fleets is its formal quality certification regime. The company operates under a China Quality Certification (CQC) approved quality management system that fully aligns with ISO 9001:2015 requirements.

CQC certification for CQC’s product range (earth‑moving machinery and their parts, including excavator undercarriage components) covers:

• Raw material receiving inspection (chemical analysis, tensile testing, hardness verification).
• In‑process control at each manufacturing node (forging dimensional checks, heat treatment temperature and cycle logging, machining tolerance sampling).
• Final product validation (non‑destructive testing, hardness profiling, dimensional conformance, seal integrity testing, and chain elongation measurement).

For the DOOSAN 20010300006, 20010300154, 20010300153, and 20010300073 track link assemblies, the quality control protocol includes:

• Ultrasonic or magnetic particle inspection (NDT) of all forged links to detect subsurface defects such as laminations, cracks, or inclusions.
• Case hardness depth measurement (microhardness traverse) on sample bushings and pins from each production batch.
• Pin‑bushing interference fit verification using calibrated hydraulic press‑out force monitoring.
• Grease seal compression check on randomly selected joints from completed track chains.
• Pitch length verification at five points along random track chain samples to ensure compliance with the 190 mm nominal dimension (±0.3 mm tolerance).

Every CQC track link assembly leaving the factory is marked with a lot number and manufacturing date code that enables traceability back to the original steel heat number, forging lot, heat‑treatment cycle, and assembly shift. This level of documentation is not only good engineering practice; it is required by many international mining companies before they will approve a new aftermarket undercarriage supplier.

6. CQC Global Business Development Team – Jack, Haily, and Mr. Zhou

CQC TRACK relies on a dedicated International Business Team to manage the complex logistics, documentation, and customer‑specific requirements of global excavator parts supply. The team consists of regional specialists who understand the unique commercial and technical practices in each market.

• 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, including drawing‑based customizations for unusual track link lengths or special bushing materials.
• Haily – Export Coordinator for Central Asia, South Korea, and Australia.
  Haily specializes 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 also works directly with Australian resource 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 in the Port of Brisbane, Port of Melbourne, and Port of Busan ensure that CQC’s track link assemblies arrive on time even for time‑sensitive project 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, UAE, Jordan, Turkey, Nigeria, Ghana, Democratic Republic of Congo, Zambia, Kenya, Indonesia, Thailand, and the Philippines. Mr. Zhou is also responsible for on‑site technical support missions, visiting project sites to inspect worn undercarriage components, confirm part number exchanges, and provide installation guidance for track link assemblies when required.

All three team members share a common mission: to provide fast, accurate, and professional responses to inquiries for DOOSAN track link assemblies, including cross‑referencing complex part number variations, advising on 45‑link vs 49‑link configurations for specific machine serial numbers, and preparing technical documentation for customers who require formal product specifications before purchase.

7. Global Market Coverage – Supplying Mines and Construction Sites Across Six Continents

CQC TRACK’s DOOSAN track link assemblies and wider undercarriage component range are currently shipped to major construction and mining markets on every continent except Antarctica. The company’s global supply network relies on established logistics partnerships with sea freight carriers (Maersk, COSCO, MSC), air freight providers (DHL, FedEx, UPS), and rail freight operators for overland delivery to land‑locked regions.

Europe – CQC supplies DOOSAN, Caterpillar, Komatsu, and Volvo undercarriage parts to distributors and project sites in Germany, Poland, Finland, Sweden, Norway, the Netherlands, Belgium, France, Spain, Italy, Greece, and the United Kingdom. European customers particularly value CQC’s CE compliance documentation and the company’s ability to provide Type Approval certificates for road‑transportable tracked machines where undercarriage replacements must not alter the original vehicle configuration.

West Asia & the Middle East – Major destinations include Saudi Arabia (NEOM project sites, mining phosphate operations), the United Arab Emirates (Dubai and Abu Dhabi infrastructure), Qatar (construction and port expansion), Jordan (potash and phosphate mines), Turkey (aggregate quarries and hydroelectric projects), and Kuwait (oilfield service roads and camp construction) . The extreme desert conditions require track link assemblies with robust sealing against fine sand infiltration, a requirement that CQC has met through its proprietary seal ring design and high‑viscosity grease fill.

Central Asia – CQC ships regularly to Kazakhstan (mining regions in Karaganda and Pavlodar), Uzbekistan (gold and copper mines), Mongolia (Oyu Tolgoi copper‑gold mine and associated infrastructure), and Tajikistan via the Dostyk–Alashankou rail corridor. Central Asian customers prefer CQC’s 190 mm pitch track link assemblies in 49‑link configuration to reduce ground pressure in the region’s frequently soft or frozen soils.

South America – CQC’s largest market in the Americas is Chile, followed by Peru (copper and zinc mining), Brazil (iron ore, gold, and large infrastructure projects), Argentina, Colombia, and Bolivia. In Chile’s Atacama Desert mines where daily temperatures fluctuate widely and airborne dust is extremely abrasive, CQC’s deep‑case‑hardened bushings and lubricated seals have demonstrated exceptional survival rates. CQC maintains a regional stock arrangement with a logistics partner in Antofagasta, Chile, to reduce lead times for urgent mining orders.

Russia – CQC holds an established supply channel to mining and construction operations across the Russian Federation, including Siberia (diamond and coal mining), the Urals region, and Far Eastern ports such as Vladivostok. Shipments are routed via sea freight to Vladivostok or Vostochny and then distributed inland via the Trans‑Siberian Railway. All CQC shipments to Russia include the requisite customs documentation and, where applicable, GOST certification statements.

South Korea – A significant portion of CQC’s Asian export volume goes to South Korea, where excavator fleet density is among the highest in the world. CQC supplies track link assemblies to equipment dealers, rebuild shops, and direct fleet accounts in Seoul, Incheon, Busan, and Ulsan. The 45‑link and 49‑link 190 mm pitch configurations are both popular in Korea, depending on the target excavator model.

North America – CQC exports to the United States and Canada, primarily supplying aftermarket distributors, equipment rebuild centers, and large‑scale infrastructure contractors working on highway, bridge, and pipeline projects. CQC’s ISO 9001:2015 and CQC certification documentation satisfies the quality documentation requirements of most North American buyers, eliminating the need for second‑party audits.

Australia – CQC has established a consistent export flow to Australia, including the mining states of 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 link assemblies, and CQC’s traceability system provides these documents routinely.

Africa – CQC supplies mines and contractors in South Africa (platinum, gold, manganese, chrome mines), Zambia (copper), Democratic Republic of Congo (cobalt and copper), Ghana (gold), Nigeria (infrastructure), Kenya (road and rail projects), Tanzania, and Angola. Africa’s combination of high‑abrasion conditions and sometimes‑limited local maintenance facilities means that the extended service life of CQC’s 190 mm pitch track link assemblies is a primary buying factor.

Across all these regions, CQC’s value proposition remains the same: reliable, 100% interchangeable DOOSAN track link assemblies manufactured to OEM quality standards, supported by a professional international team, and delivered through a proven global logistics network.

8. Conclusion – CQC TRACK: Your Global Partner for DOOSAN 190 mm Pitch Track Link Assemblies

For fleet managers, equipment dealers, and mining procurement teams seeking a reliable source of DOOSAN DX200A, DX225LCA, S200, S220, and S225LC track link assemblies matching OEM part numbers 20010300006, 20010300154, 20010300153, and 20010300073 in 45‑link or 49‑link configurations with 190 mm pitch, CQC TRACK offers a complete solution.

CQC combines vertically integrated manufacturing (casting foundry, forging plant, bucket tooth forging shop, final assembly plant, and CNC machining workshop) with international quality certification (ISO 9001:2015 / CQC) , field‑proven metallurgy (forged alloy steel, deep case‑hardened bushings, Duo‑Cone seals), and a dedicated global business team (Jack, Haily, Mr. Zhou).

Reach out to CQC TRACK for:

• Direct factory supply of 190 mm pitch track link assemblies for DOOSAN S‑series and DX‑series excavators.
• OEM and ODM undercarriage manufacturing for mixed fleets (DOOSAN, Caterpillar, Komatsu, Hitachi, Hyundai, Volvo, and others).
• Technical support, part number cross‑referencing, and installation guidance.
• Global shipping to Europe, West Asia, Central Asia, South America, Russia, South Korea, North America, Australia, and Africa.

CQC TRACK – Engineering Confidence Into Every Track Link.

For pricing, technical data sheets, and order placement, contact CQC’s International Business Team directly: Jack, Haily, or Mr. Zhou.