LIEBHERR Excavator R974 / R976 – Part No. 10800269 Track Carrier Roller Assembly / Upper Roller Assembly Specialized Supplier & ODM Manufacturer of Undercarriage Components for Liebherr Crawler Construction Machinery – cqctarck

On Liebherr R974 and R976 crawler excavators, the track carrier roller—also known as the upper roller—plays a role that is often underestimated until it fails. It supports the upper run of the track chain, maintains correct chain alignment between the drive sprocket and the front idler, reduces rolling resistance, and absorbs continuous shock and vibration during tramming, digging, and loading. In large mining and construction-class machines, a weak carrier roller leads directly to accelerated chain wear, increased fuel consumption, and unplanned downtime. cqctarck supplies the LIEBHERR 10800269 Track Carrier Roller Assembly as a direct-fit, heavy-duty replacement, backed by specialized ODM manufacturing for Liebherr crawler undercarriage components.

1. Manufacturer Strength: OEM Pedigree, ODM Capability, and Specialized Undercarriage Technology
cqctarck is a specialized manufacturer of heavy-duty crawler undercarriage components, not a trading company or a generic aftermarket assembler. Our factory operates active OEM production lines for globally recognized machine brands including Hitachi, Kobelco, LiuGong, XCMG, and SDLG. This OEM background imposes strict process control across raw material verification, forging and casting, heat treatment, precision machining, sealing, and final inspection. For Liebherr R974/R976 owners and distributors, we apply this same discipline through our ODM service. We can manufacture the 10800269 carrier roller assembly from customer drawings, samples, or reverse-engineered data, with full control over metallurgy, hardness, seal selection, grease specification, and dimensional tolerances. Our engineering team includes forging specialists, foundry technologists, heat treatment metallurgists, and CNC machining programmers who work specifically on large crawler undercarriage components.

2. Product Technical Description: LIEBHERR 10800269 Track Carrier Roller / Upper Roller Assembly
Every cqctarck carrier roller for the Liebherr R974/R976 is manufactured through a sequenced production route designed to address the known failure modes of large mining-class upper rollers: tread wear, shell cracking, seal leakage, shaft fretting, and lubricant breakdown. The technical specification is as follows:

• Roller Body – Forged Alloy Round Steel: The main roller body is hot-forged from high-grade alloy round steel. Forging aligns the grain flow along the roller contour, producing a dense, homogeneous structure with superior impact toughness and fatigue resistance compared with ordinary cast or billet-machined rollers. This forged body forms the load-bearing foundation of the assembly.
• Side Covers – Spheroidal Graphite Iron Casting: The side covers are produced from spheroidal graphite iron, also known as ductile iron or nodular iron. This material provides an excellent balance of tensile strength, elongation, and shock absorption. It resists cracking under lateral impact and maintains cover rigidity when the excavator is tramming over broken rock or operating on uneven bench floors.
• Shaft – Double Seal Groove Design: The shaft is precision-machined with double seal grooves on each end. This double-groove configuration provides a stable and accurate seating position for the sealing elements, maintaining correct seal face pressure and alignment under repeated load reversals. The result is improved sealing stability and reduced risk of seal displacement during heavy tramming or digging cycles.
• Sealing System – Multi-Layer Sealing with Top-Tier Imported Oil Seals: The carrier roller uses a multi-layer sealing architecture with premium imported oil seals selected for mining-class contamination resistance. The sealing system is designed to retain lubricant and exclude external abrasives such as fine rock dust, silica, water, and mud slurry. This is critical on the R974/R976, where undercarriage components often operate in wet, abrasive, and high-impact conditions.
• Lubrication – Anti-Freeze Performance Grease: The internal cavity is charged with anti-freeze grease formulated for wide-temperature operation. This lubricant maintains its film strength and pumpability in cold climates while resisting thermal degradation in hot mining environments. It protects the shaft, bushing, and seal contact surfaces from wear and corrosion throughout the service interval.
• Heat Treatment – Quench and Temper, Rough and Finish Machining, Medium-Frequency Induction Hardening, Tempering: The roller body first undergoes overall quenching and tempering to refine the core microstructure and establish a tough, impact-resistant foundation. Rough machining and precision finish machining follow, bringing all critical dimensions, bores, and faces to specification. The tread and flange surfaces are then hardened by medium-frequency induction heating and immediate quenching. A controlled tempering step follows to relieve stress while preserving the hardened case. Final surface hardness is maintained at 55–62 HRC, delivering aggressive wear resistance while the tempered core continues to absorb high-impact loading without brittle fracture.

3. Twenty Years of Continuous Process Improvement and Global Mine-Site Validation
The manufacturing route used for the Liebherr 10800269 carrier roller is the result of more than 20 years of continuous process development. During this period, cqctarck has refined forging dies, casting methods, seal groove geometry, induction coil design, and tempering parameters based on field returns, teardown inspections, and wear-life analysis. These improvements have been repeatedly validated in some of the most demanding mining, quarrying, and construction environments in the world. cqctarck undercarriage components have accumulated service hours in high-altitude copper mines in Ecuador and Peru, deep-level and open-pit operations in South Africa, frozen overburden and mineral extraction sites in Russia, precision quarrying and mining applications in South Korea, premium high-output mining fleets in India, abrasive volcanic and tropical operations across South Pacific nations, heavy infrastructure and quarry projects in Vietnam, open-pit coal and metal mines in Kazakhstan and Central Asia, large earthmoving projects in North America, and hard-rock mining and construction sites in Turkey. In each environment, the carrier roller has demonstrated stable seal performance, predictable tread wear, and reliable structural integrity under extreme load.

4. Related Components and ODM Customization
As a dedicated undercarriage manufacturer, cqctarck also supplies the related components required for complete carrier roller service and rebuild programs. These include replacement shafts, spheroidal graphite iron side covers, complete seal kits with imported oil seals, bushings, thrust washers, mounting bolts and hardware, as well as anti-freeze lubricating grease. Because these parts are produced under the same quality system as the complete Liebherr 10800269 carrier roller assembly, interchangeability and consistent performance are assured.

ODM customization is available for qualified mining customers, rebuild centers, and distributor programs. Depending on order volume and application requirements, cqctarck can adjust seal selection, grease type, hardness targets within the specified range, packaging, labeling, and other non-critical parameters. Customized solutions are developed with direct engineering input to ensure that the modified carrier roller remains fully compatible with the R974/R976 track frame and track chain interface.

5. Global Export Markets
cqctarck heavy-duty undercarriage components are regularly exported to quality-sensitive markets across the world. Our current and repeat export regions include South America, including Ecuador and Peru; South Africa; the Russian Federation; South Korea; high-end product segments in India; South Pacific island nations; Vietnam; Kazakhstan and other Central Asian countries; North America; and Turkey. In demanding markets such as South Korea and India’s premium mining aftermarket, cqctarck products are selected by customers who conduct comparative lifecycle testing before approving a supplier. This repeat acceptance reflects the field-proven reliability and cost-per-hour performance of our undercarriage components.

6. cqctarck International Business Team
Our global customer support is managed by an experienced international business team with practical knowledge of mining undercarriage applications. Team members Philip, Jack, and Haily coordinate technical inquiries, quotations, order processing, and after-sales communication directly with the factory. They work closely with engineering and production to ensure that every customer receives accurate compatibility confirmation, realistic lead times, and responsive service. This product document has been personally compiled and written by Jack, based on direct factory engineering input and long-term field feedback from mining undercarriage users in our export markets.

For technical specifications, compatibility verification, ODM customization requests, or direct factory pricing on the LIEBHERR R974/R976 Track Carrier Roller Assembly / Upper Roller Assembly – Part No. 10800269, contact the cqctarck international team. We supply heavy-duty undercarriage components engineered for mining and construction reality—direct from the manufacturer, with ODM customization available.