LIUGONG 51C1111 Track Bottom Roller Assembly – CQCTRACK – OEM Manufacturer Directly Supplies Chassis Parts for 60-Ton Tracked Excavators

1. Product Identification: LIUGONG 51C1111 Track Bottom Roller Assembly for Heavy-Duty Crawler Excavators

The LIUGONG 51C1111 Track Bottom Roller Assembly (also referred to in industry catalogs as a lower track roller assembly, track bottom roller assembly, or undercarriage bottom roller) is a critical load-bearing chassis component specifically engineered for LIUGONG’s large-class crawler excavators in the 50–70 ton range, encompassing heavy-duty production platforms such as the CLG965E series, CLG970E series, and associated 60-ton-class configurations. Operating within the 50–70 metric ton weight class, these large excavators demand undercarriage components engineered to withstand extreme loads, high-impact conditions, and continuous abrasive wear in demanding environments.

A track bottom roller assembly — also commonly referred to as a lower roller — is a critical chassis component mounted directly to the track roller frame beneath the excavator’s main body. Positioned along the lower track frame rail, the bottom roller assembly supports the full static and dynamic operating weight of the machine, transfers this load from the mainframe through the track roller frame and onto the track chain and track shoes, guides the track chain along its prescribed path to prevent lateral slippage and maintain alignment, and minimizes rolling friction during travel. Without properly engineered bottom rollers, the track chain would experience excessive friction and misalignment, leading to accelerated pin and bushing wear, premature chain elongation, reduced undercarriage life, and increased fuel consumption. For a 60-ton-class excavator operating in high-production mining or heavy construction environments, each bottom roller assembly must reliably manage cyclical impact loads, side-thrust forces during turning, and prolonged exposure to abrasive contaminants (rock dust, sand, slurry) while maintaining consistent rotational performance.

The 51C1111 OEM part number follows LIUGONG’s standardized component coding system, with “51” indicating a rolling chassis component category. This part number is compatible with LIUGONG’s large excavator platforms, with strong documentation confirming the 51C1111 part number is utilized on LIUGONG CLG965 series excavators (in the 50–65 ton class) and is applicable to several heavy-duty platforms in LIUGONG’s lineup. The sister part number 51C1110 (front idler/guide wheel assembly) has been documented for the LIUGONG CLG965 series, confirming a consistent undercarriage numbering sequence across the CLG965 and related 60-ton-class platforms. Industry reference documentation reveals the LIUGONG CLG965 track front idler/guide wheel assembly is supplied under part number 51C1110, manufactured by CQC TRACK (cqctrack), confirming that CQC’s manufacturing capabilities directly support LIUGONG CLG965 and associated 60-ton platforms.

1.1 LIUGONG’s Large Excavator Portfolio — Host Machines for 51C1111 Bottom Roller Assembly

LIUGONG Construction Machinery Co., Ltd. (Guangxi LiuGong Machinery Co., Ltd.), founded in 1958 and headquartered in Liuzhou, Guangxi Province, China, is one of the world‘s leading construction machinery manufacturers. As the first Chinese construction machinery enterprise to be listed on the capital market (1993) and an industry pioneer in internationalization, LiuGong has consistently been ranked among the global top 15 construction machinery manufacturers (Yellow Table, KHL Group). With a comprehensive distribution network spanning over 140 countries and 20 overseas subsidiaries, LiuGong’s large excavator portfolio, including the CLG965E, CLG970E, and F-series large excavators, relies on robust undercarriage systems designed for continuous heavy-duty operations.

The LIUGONG CLG965E series represents the heavy-duty backbone of LiuGong’s 50–65 ton excavator class. Factory data confirms the CLG965E operating within the 58,000–63,000 kg range (approximately 60 metric tons) and equipped with a high-torque Cummins diesel engine delivering approximately 298–336 kW (400–450 hp) for mass earthmoving, quarrying, and mining operations. The CLG965E HD (Heavy-Duty) variant is specifically configured for mining and rock excavation applications, featuring a reinforced undercarriage with heavy-duty bottom rollers such as the 51C1111 assembly, an extended track roller frame for increased stability, and optional track shoe widths up to 700–900 mm for reduced ground pressure in soft terrain conditions. Bucket capacities for the CLG965E range from 3.2 to 4.1 m³ depending on configuration, with maximum digging force exceeding 300 kN—operating parameters that place sustained high loads directly on the undercarriage.

The LIUGONG CLG970E series is an even larger platform in the 70-ton class, with documented specifications confirming an operating weight of 70,500–70,960 kg, powered by a Cummins QSX15 engine delivering 354 kW (481 hp) at 1,800 rpm. This heavy-duty excavator is factory-equipped with heavy-duty rollers, reinforced idler frame, and an optional full track guard configuration. The undercarriage system for the CLG970E utilizes a heavy-duty tracked undercarriage system with a standard track shoe width of 650 mm and track rollers that bear the full weight of the machine while enduring continuous impact, abrasion, and side-loading forces across varied terrain conditions. The CLG970E’s bucket capacities range from 4.0 m³ to 5.2 m³, with arm digging force reaching 319 kN (standard) / 347 kN (power boost), and bucket digging force reaching 360 kN (standard) / 393 kN (power boost).

1.2 Cross-Reference: LIUGONG 51C1110 Front Idler and CLG965 Platform

The LIUGONG 51C1110 front idler/guide wheel assembly has been documented as the front idler component for the LIUGONG CLG965 excavator, confirming that the CLG965 series employs a complete undercarriage system where the bottom roller assembly is part number 51C1111 and the front idler/guide wheel assembly is part number 51C1110. This numbering sequence is consistent with LiuGong’s product engineering practices for large excavator platforms.

1.3 Mining-Grade Technical Specifications

A track bottom roller assembly engineered for the LIUGONG 51C1111 application in 60-ton-class excavators must meet or exceed the following metallurgical and performance standards:

The advanced multi-stage seal system—combining the primary NBR (nitrile rubber) lip seal, grease-clearing labyrinth channels that create a positive pressure region to expel contaminants, and an external dust scraper/deflector to block larger debris and mud—has been specifically validated for performance in wet and abrasive conditions. This sealing configuration is critical for LIUGONG excavators deployed in mining regions with high concentrations of fine silica dust, clay slurry, or monsoon‑level precipitation.

2. CQC TRACK (CQCTRACK): Professional OEM Manufacturer Directly Supplying Chassis Parts for 60-Ton Tracked Excavators

CQC TRACK (Heli Machinery Manufacturing Co., Ltd., brand name cqctrack) , headquartered in Quanzhou, Fujian Province, China, is a specialized manufacturer and direct supplier of OEM (Original Equipment Manufacturer) and ODM (Original Design Manufacturer) undercarriage components for medium to ultra-large tracked excavators, including heavy-duty 60-ton class machines, and for drilling rigs, bulldozers, crawler loaders, and tunnel boring machinery. With over 20 years of specialized undercarriage manufacturing experience, CQC TRACK serves as a trusted partner for international mining companies, heavy construction contractors, equipment rebuilders, and aftermarket distributors across six continents.

CQC TRACK’s manufacturing operations are fully vertically integrated, covering the four primary undercarriage product categories: track bottom rollers, carrier rollers (top rollers), track front idlers, track sprockets, and track link assemblies (track chains). This breadth of manufacturing capability allows CQC to supply complete undercarriage systems for large LIUGONG excavators, including the 51C1111 track bottom roller assembly, compatible track front idlers (51C1110), and track chain groups.

2.1 OEM Manufacturing — Exact Fit for LIUGONG Specifications

As an OEM manufacturer, CQC TRACK produces the LIUGONG 51C1111 Track Bottom Roller Assembly to exact dimensional, metallurgical, and performance specifications — every critical parameter (roller outer diameter, flange spacing, bore diameter, shaft interface geometry, flange design, and heat treatment profile) is verified against the original LIUGONG part standards to ensure 100% interchangeability without any frame modification, re‑welding, or re‑drilling. The induction‑hardened raceway, forged alloy steel construction, and multi‑labyrinth sealed bearing system are engineered to deliver extended service life even in highly abrasive environments.

CQC’s technical capabilities for LIUGONG undercarriage components are documented across multiple product lines. For the LIUGONG CLG933E, CQC produces the 51C0331 track bottom roller assembly utilizing induction‑hardened raceway, forged alloy steel construction, and multi‑labyrinth sealed bearing system. For the LIUGONG CLG970E (70‑ton class), CQC produces the 14C0287 / 14C0287C1 track bottom roller assembly as a precision‑engineered heavy‑duty chassis component designed for the CLG970E. For the LIUGONG CLG936E, CQC produces the 51C0249 track bottom roller assembly with forged components, advanced sealing technology, and optimized heat treatment processes. The LIUGONG CLG965 front idler/guide wheel assembly (part number 51C1110) is documented as being manufactured by CQC TRACK, confirming that CQC’s engineering capabilities directly support this heavy‑duty platform. This extensive LIUGONG product portfolio demonstrates CQC’s mastery of LiuGong’s component engineering.

2.2 ODM Manufacturing — Custom Engineering for Unique Mining Requirements

As an ODM manufacturer, CQC TRACK offers custom engineering and design services for customers who require track bottom roller assemblies with modified specifications beyond standard OEM configurations:

• Increased Flange Height / Profile: For applications requiring enhanced lateral track guidance — such as mining operations with severe side‑slope conditions, extended undercarriage configurations, or soft‑ground excavation in mud, swamp, or clay — CQC can modify flange geometry to provide greater track retention and prevent derailment during turning on uneven terrain.
• Alternative Duo‑Cone or Labyrinth Seal Materials: For extreme‑temperature mining environments (Canadian oil sands at −45°C, Siberian diamond mines, Atacama Desert copper mines at +50°C), specialized seal compounds that maintain flexibility and sealing effectiveness from −50°C to +150°C can be specified. Advanced dual‑cone or floating oil seal systems can replace the standard triple‑labyrinth configuration for the most demanding applications.
• Enhanced Case‑Hardened Depth: For ultra‑highly abrasive environments such as granite quarries, iron ore mines (Western Australia’s Pilbara region), or silica‑rich sites in Chile and South Africa, CQC can extend case‑hardened depth to 10–12 mm at HRC45–HRC50, providing significantly extended wear life compared to standard 6–8 mm case depth.
• Specialized Bearing Cartridges: For applications with unusually high shock loads (blasted rock handling) or continuous high‑speed travel between widely separated work zones (e.g., pipeline construction across desert terrain), upgraded spherical roller bearings or higher‑capacity tapered roller bearings with enhanced grease retention can be incorporated.

Customers can provide original equipment drawings (LiuGong’s official part drawings where available), CAD models, or physical samples, and CQC’s in‑house engineering team will reverse‑engineer or redesign the track bottom roller assembly to meet specific mine‑site operational requirements.

2.3 Quality Certification — ISO 9001:2015

CQC TRACK holds ISO 9001:2015 certification and operates under a formal quality management system. CQC’s documented quality control procedures for track rollers include:

• Raw material traceability: Each batch of steel used in 51C1111 production is chemically analyzed using optical emission spectroscopy to confirm alloy composition (50Mn, 55Mn, 40Cr, 42CrMo) meets LIUGONG’s original material specifications.
• In‑process control: Hardness testing (Rockwell C scale) is conducted on roller bodies, flange surfaces, raceways, and shafts at multiple production stages to confirm surface hardness of 55–60 HRC with case depth of 6–10 mm at HRC45–HRC50.
• Non‑destructive testing (NDT): Ultrasonic flaw detection and magnetic particle inspection are performed on all forged or cast roller bodies to detect subsurface defects such as laminations, cracks, voids, or porosity that could lead to catastrophic failure under high‑impact loads.
• Final product validation: Each finished bottom roller assembly undergoes rotational torque verification (to confirm proper bearing and seal compression), seal leak testing under simulated operating pressure (50–80 bar), flange profile dimensional inspection (±0.05 mm tolerance), and final visual inspection for surface finish and coating integrity.
• Traceability: Each completed bottom roller assembly is marked with a unique batch code linking it to the original steel heat number, forging or casting lot, heat‑treatment cycle, and final assembly shift — a level of traceability demanded by international mining companies in Australia, Chile, Canada, and South Africa before approving a new aftermarket undercarriage supplier.

3. Vertically Integrated Manufacturing Infrastructure — Direct Factory Supply

CQC TRACK’s ability to consistently deliver mining‑grade LIUGONG 51C1111 Track Bottom Roller Assemblies and other heavy‑duty chassis parts rests upon a fully vertically integrated manufacturing infrastructure. This vertical integration eliminates supply chain variability, quality inconsistencies, and production delays associated with subcontracting, enabling faster lead times (typically 15–20 working days for standard orders), superior quality consistency, and the flexibility to accommodate ODM customizations without external dependency.

Casting Foundry. Produces raw blanks for selected undercarriage components (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 and structural integrity before proceeding to subsequent operations.

Forging Plant. The core facility for producing CQC‘s LIUGONG 51C1111 track bottom roller bodies. High‑tensile alloy steel billets (50Mn or 40Cr grades) are heated to controlled austenitizing temperatures (1,100–1,200°C) and shaped using hydraulic press forging. Closed‑die forging aligns the metallic grain flow with the contour of the roller body, significantly enhancing fatigue resistance and impact toughness compared to cast alternatives.

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 suite of excavator wear parts — bucket teeth and adapters for LIUGONG, CATERPILLAR, KOMATSU, HITACHI, VOLVO, and other brands — alongside the undercarriage track bottom roller assemblies, consolidating procurement for fleet owners.

CNC Machining Workshop. Equipped with CNC vertical lathes, horizontal boring mills, and precision grinding centers. Critical finishing operations for the 51C1111 assembly include precision turning of roller outer diameter to exact dimensions (±0.05 mm tolerance), finishing of dual flange geometries, precision boring of bearing cavities and shaft journal interfaces, grinding of mounting surfaces, and final dimensional laser scanning for quality assurance. The precision‑machined end caps and high‑strength, grade‑marked bolts ensure assembly integrity.

Final Assembly Plant. The LIUGONG 51C1111 track bottom roller assemblies are assembled on dedicated indexing lines using hydraulic pressing equipment calibrated to achieve precise bearing fit and shaft alignment. The advanced multi‑stage labyrinth seal system — incorporating primary NBR lip seal, grease‑clearing labyrinth channels, and external dust scraper/deflector — is installed with measured grease volumes (typically 150–200 ml per roller assembly depending on size). Each assembly undergoes rotational torque verification to ensure correct seal compression and bearing preload, leak testing under 50–80 bar pressure for 30 minutes minimum, flange hardness and profile inspection to confirm induction‑hardened surfaces (55–60 HRC) and proper dual flange geometry, and final visual inspection for surface finish, paint/coating integrity, and overall fit.

4. Field-Proven Reliability — Extensive Performance in Mining and Heavy Construction

CQC‘s LIUGONG 51C1111 track bottom roller assemblies and undercarriage components have accumulated extensive field service across some of the world‘s most demanding mining and heavy construction environments, including the regions where large LIUGONG excavators are widely deployed — South America, Africa, Southeast Asia, Russia, Australia, and the Middle East.

4.1 Copper Mining — Atacama Desert, Chile

In Chile‘s Atacama Desert copper mines, where daily temperatures fluctuate dramatically between +5°C at night and +45°C during the day, airborne silica dust is highly abrasive, and fine particulate matter infiltrates even small crevices, CQC‘s case-hardened bottom rollers (HRC55–60 surface hardness with 8–10 mm case depth) and multi‑stage labyrinth seal systems achieve extended service life — typically 3,000–3,500 hours in continuous mining operations — compared to generic aftermarket substitutes that frequently fail within 2,000–2,500 hours. For mine maintenance planners operating ten or more LIUGONG CLG965E/CLG970E excavators in large‑scale copper operations, extended bottom roller life translates directly into reduced unscheduled downtime and lower annual undercarriage parts expenditure.

4.2 Iron Ore and Coal Mining — Australia

In iron ore mining in Western Australia‘s Pilbara region and coal mining in Queensland‘s Bowen Basin — where high-impact loads from sharp rock fragments, high-speed travel between widely separated work zones, high ambient temperatures (frequently exceeding 40°C), and extremely abrasive ground conditions place severe stress on undercarriage components — CQC‘s forged bottom rollers demonstrate exceptional fatigue resistance and impact absorption. The induction-hardened dual flanges (HRC55–60) resist chipping and cracking even after prolonged exposure to sharp iron ore and coal fragments, while the multi‑stage labyrinth seal system prevents abrasive dust ingress. Australian mine maintenance engineers have reported significant reductions in roller-related undercarriage interventions after switching to CQC assemblies.

4.3 Platinum, Chrome, and Gold Mining — South Africa

In South Africa‘s platinum and chrome mines within the Bushveld Igneous Complex, and in gold mines across the Witwatersrand Basin, where crushed rock generates severe impact loads on bottom rollers, flanges, and bearings, CQC‘s track bottom rollers have confirmed their structural integrity and sealing effectiveness after thousands of hours of operation without flange cracking, seal failure, or bearing contamination. For mine maintenance directors operating large LIUGONG excavators in the Rustenburg, Polokwane, and Carletonville mining districts, this translates into predictable service life and the ability to plan undercarriage maintenance intervals with confidence.

4.4 Extreme Cold-Climate Mining — Russia and Canada

In Siberian diamond and coal mines (Sakha Republic and Kemerovo Oblast) where winter temperatures drop below −45°C, and in Canadian oil sands operations in the Athabasca region (Alberta) where extreme cold is combined with highly abrasive silica sand, CQC‘s low-temperature seal options maintain flexibility and sealing effectiveness at sub‑zero temperatures while the forged steel roller bodies resist brittle fracture. The Lube‑for‑Life factory‑sealed design eliminates routine maintenance in cold conditions where field servicing would be extremely challenging.

4.5 Heavy Infrastructure and Quarrying — Middle East, Southeast Asia, and South America

In NEOM mega-project sites in Saudi Arabia’s fine desert sand conditions, where fine sand ingress is the primary mode of seal failure, the multi‑stage labyrinth seal system — with its grease‑clearing labyrinth channels creating a positive pressure region to expel contaminants — has been validated for performance in highly abrasive environments. In heavy quarry operations in Indonesia, Thailand, the Philippines, and Vietnam, where monsoon rains create clay and slurry conditions that are notoriously hard on track seals, the external dust scraper/deflector blocks larger debris and mud. In hydroelectric dam projects in Turkey and Brazil, where saturated clay soils and long travel distances between work zones place continuous stress on undercarriage components, CQC‘s assemblies have demonstrated extended lubrication life and minimal seal maintenance requirements.

4.6 International Fleet Operator Field Data Summary

Independent field comparisons conducted by large international fleet operators (mines and heavy construction contractors operating mixed LIUGONG, CATERPILLAR, KOMATSU, HITACHI, and VOLVO fleets) consistently demonstrate that CQC‘s track bottom rollers offer:

• Extended service life compared to standard aftermarket components — typically 30% longer in mining conditions.
• Reduced unscheduled downtime — 15–20% reduction in roller-related undercarriage interventions across large excavator fleets.
• Substantial annual reduction in undercarriage parts expenditure — 20–25% lower total cost of ownership when replacing generic aftermarket rollers with CQC assemblies.
• Near‑zero seal failure incidents during the first 2,000 hours of operation in normal to heavy conditions.

For large mining fleets operating ten or more 60‑ton‑class LIUGONG excavators, the combined savings in parts cost, labor, 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.

5. CQC‘s Dedicated International Business Team — Jack, Haily, and 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 extensive 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 (United States, Canada, Mexico). He coordinates with CQC‘s in‑house logistics department to arrange sea freight (FCL/LCL) , rail freight (for overland delivery to land‑locked Central Asian markets), 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.
• 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, Tajikistan via the Dostyk–Alashankou rail corridor), South Korea (Incheon, Busan, Ulsan), and Australia (Brisbane, Melbourne, Fremantle). 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 certification documentation as part of their supplier quality pre‑qualification process. Her strong relationships with freight forwarders ensure that CQC‘s LIUGONG bottom 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 over 15 years of experience in heavy equipment parts supply 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 bottom roller assemblies when required.

6. Global Market Coverage — Supplying Mining and Construction Operations Across Six Continents

CQC‘s LIUGONG 51C1111 Track Bottom 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 — Carajás and Minas Gerais), Argentina, Colombia, Bolivia.
• Russia — Siberian diamond and coal mines (Yakutia, Kemerovo), Urals region mining and Far Eastern ports (Vladivostok, Vostochny), 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 centers, and large‑scale infrastructure contractors working on highway, bridge, and pipeline projects. CQC‘s ISO 9001:2015 certification documentation satisfies most North American buyer quality requirements.
• Australia — Western Australia (Pilbara iron ore mines), Queensland (Bowen Basin coal mines and copper operations), 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 bottom roller assemblies, and CQC‘s traceability system provides these documents routinely.
• Africa — South Africa (Bushveld Igneous Complex platinum, gold, manganese, and chrome mines), Zambia (Copperbelt region), Democratic Republic of Congo (Katanga copper and cobalt belt), Ghana (Ashanti gold belt), Nigeria (infrastructure), Kenya (road and rail projects), Tanzania, and Angola.

7. Conclusion — Choose CQC TRACK for LIUGONG 51C1111 Track Bottom Roller Assemblies

For fleet managers, mining procurement teams, equipment dealers, and infrastructure contractors requiring a reliable source of LIUGONG 51C1111 Track Bottom Roller Assemblies for 60‑ton‑class crawler excavators, CQC TRACK (cqctrack, Heli Machinery Manufacturing Co., Ltd.) offers a complete, vertically integrated manufacturing solution backed by over 20 years of specialized 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 LIUGONG CLG965E, CLG970E, and associated 60‑ton‑class platforms, with documented compatibility for LIUGONG CLG933E (51C0331), CLG936E (51C0249), CLG965 (51C1110 front idler), and CLG970E (14C0287 series).
• International quality certifications — ISO 9001:2015, with CQC’s documented quality control procedures for every production batch.
• Mining‑grade metallurgy — forged or precision‑cast 50Mn/40Cr steel bodies, multi‑stage labyrinth sealing system (primary NBR lip seal + grease‑clearing labyrinth channels + external dust scraper/deflector), induction‑hardened raceway (55–60 HRC), dual flange geometry for secure track guidance, and case hardening to 6–10 mm depth.
• Proven field performance — thousands of hours of service life in mining conditions across Chile, Australia, South Africa, Russia, Canada, Saudi Arabia, and Indonesia, with documented service life extension of up to 30% compared to generic 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 LIUGONG 51C1111 Track Bottom Roller Assemblies and compatible undercarriage components for 60‑ton‑class excavators.
• OEM and ODM undercarriage manufacturing for mixed fleets (LIUGONG, CATERPILLAR, KOMATSU, HITACHI, VOLVO, DOOSAN, HYUNDAI, and other major brands).
• Technical support, part number cross‑referencing, and installation guidance — including cross‑referencing 51C1111 to specific LIUGONG CLG965E and CLG970E machine serial numbers.
• Global shipping solutions tailored to your mine or project site location.

CQC TRACK — Engineering Mining‑Grade Reliability into Every Track Bottom Roller Assembly.