Sumitomo SH700 / Case CX700 / CX750 Excavator Track Sprocket Wheel Assembly – Travel Motor Drive Wheel (P/N: KWA0021) – Heavy-Duty Mining Undercarriage Parts by CQC Track

On a 70-tonne mining excavator, the final drive sprocket—often called the travel motor drive wheel—is the singular component that converts hydraulic motor torque into tracked motion. It directly meshes with the track chain, transmitting enormous forces while withstanding abrasive slurry, impact loads, and continuous high-cycle fatigue. For the Sumitomo SH700 and its Case-branded siblings, the CX700, CX700B, and CX750, this sprocket assembly is a mission-critical drivetrain element. CQCTRACK, the dedicated undercarriage engineering division of CQC International, manufactures a premium, OEM-caliber replacement Track Sprocket Wheel Assembly (Travel Motor Drive Wheel) precisely interchangeable with genuine part number KWA0021. Built inside the same factory that currently supplies leading global OEMs and refined through 20 years of field feedback, this sprocket assembly is engineered for the severe demands of open-pit mining, mass excavation, and quarry face loading. Authored by Jack, with international service support from Philip and Haily, this technical overview demonstrates why CQCTRACK is the trusted supplier of drivetrain undercarriage components for Sumitomo and Case heavy excavators worldwide.

1. Manufacturer Strength: Embedded OEM Production with a Global Supply Footprint

The performance and service life of a final drive sprocket begins at the factory floor. CQCTRACK components are manufactured within a fully integrated, high-volume production facility that operates as a certified OEM undercarriage manufacturing base. Our factory is a current, audited supplier of complete track assemblies, rollers, idlers, and sprockets to Hitachi, Kobelco, LiuGong, XCMG, and SDLG. This privileged position means the Sumitomo/Case KWA0021 Sprocket Wheel Assembly benefits from the identical forging presses, heat-treatment furnaces, CNC machining centers, and quality control systems that deliver to Japanese, Korean, and Chinese OEM assembly lines. There is no separation between “genuine” and “aftermarket” production pathways—every component we ship carries the embedded manufacturing DNA of a global OEM supplier. This reality ensures dimensional accuracy, material integrity, and process repeatability that generic aftermarket alternatives cannot replicate.

2. Technical Architecture: A Sprocket Assembly Engineered for Extreme Duty Cycles

A sprocket wheel operating at the travel motor interface must resist tooth flank wear, root cracking, and internal bearing contamination. The CQCTRACK KWA0021 Sprocket Wheel Assembly is constructed through a meticulously sequenced, high-integrity manufacturing process:

• Cast Alloy Steel Sprocket Rim: The drive rim begins as a solid billet of high-grade alloy round steel, hot-forged to align the internal grain flow precisely with each tooth profile. This forging process eliminates the porosity, inclusions, and inconsistent microstructure of cast alternatives, delivering a monolithic structure with exceptional resistance to bending fatigue, tooth root cracking, and impact-induced fracture under shock loading.
• Integral Quench and Temper Treatment: The complete forged sprocket body undergoes a rigorous through-quenching and tempering cycle prior to any finish machining. This foundational heat treatment refines the core microstructure into uniform tempered martensite, providing an optimal combination of high tensile strength and ductile toughness that prevents permanent tooth deformation or brittle failure under extreme torque.
• Precision CNC Machining and Induction-Hardened Tooth Profiles (55–62 HRC): After rough machining and precision CNC finishing to exact OEM dimensional tolerances, the tooth flanks and engagement surfaces are selectively hardened via a controlled medium-frequency induction hardening process. The surface hardness is consistently maintained between 55 and 62 HRC, forming a deep, wear-resistant case that dramatically reduces abrasive tooth wear, “hooking” deformation, and pitch-line spalling. The ductile, tempered core beneath this hard case absorbs dynamic shock without crack propagation.
• Dual-Seal-Groove Shaft and Top-Tier Floating Seal System: The sprocket mounting interface is designed with a precision-ground dual seal groove profile, forming a labyrinth that accommodates a top-tier duo-cone floating seal set. This metal-face-to-metal-face sealing technology is universally recognized as the most reliable barrier against the ingress of water, mud, fine silica dust, and abrasive mining slurry. The sealed internal bearing cavity is factory-filled with a specially formulated low-temperature-resistant anti-freeze grease, guaranteeing immediate full-film lubrication at every startup and uninterrupted corrosion protection across a temperature range from Arctic deep-freeze to tropical humidity.
• Spheroidal Graphite (Ductile) Iron Side Covers: The side covers are produced using a spheroidal graphite iron casting process, selected for its superior dimensional stability and wear resistance. This ensures a consistently flat, flawless mating surface for the floating seals, maintaining uniform seal compression and absolute leak-free integrity over the sprocket’s entire service life.

3. Twenty Years of Iterative Process Perfection, Validated in the World’s Harshest Mines

The CQCTRACK KWA0021 Sprocket Wheel Assembly is not a theoretical design—it is the product of a 20-year continuous engineering improvement process, driven by real-world failure mode analysis and wear data collected from the planet’s most aggressive mining and quarrying environments. Our undercarriage components have been repeatedly tested, analyzed, and refined through sustained operation in the deep-level gold and platinum mines of South Africa, the high-altitude copper and silver pits of Peru and Ecuador, the frozen iron ore basins of Russia, the hard-rock quarry and demolition sites of South Korea, and the large-scale infrastructure and mining projects of India. Each refinement—from optimizing the tempering curve to eliminate residual stress concentrations, to precisely calibrating the induction hardening scan parameters for uniform case depth, to verifying the long-term cold-flow characteristics of the anti-freeze grease—has been engineered directly back into our production standard. The quality stability and operational reliability of this sprocket assembly are not catalog promises; they are hard-won, field-verified attributes documented over millions of machine operating hours.

4. A Complete, Synchronized Undercarriage Ecosystem

A final drive sprocket functions as one element within a wear-interdependent undercarriage system. Installing a premium-grade sprocket alongside worn track chains or marginal bottom rollers creates a costly misalignment of component life, accelerating system-wide wear. CQCTRACK eliminates this risk by manufacturing a comprehensive, in-house suite of related undercarriage parts for the Sumitomo SH700 and Case CX700/CX700B/CX750 mining excavators. Our product program includes matched track link assemblies with induction-hardened pins and bushings, bottom roller assemblies (P/N: KWA10170), front idler wheel assemblies (P/N: KWA10200/KWA0029), and upper carrier rollers(KWA0074), all produced within a unified metallurgical and thermal processing envelope. The CQC International business team—comprising Philip, Jack, and Haily—is structured to deliver these components as coordinated, kit-based shipments, ensuring your maintenance operation receives a fully harmonized set of undercarriage parts that wear at a predictable, engineered rate.

5. Global Export Reach into Premium, Quality-Conscious Markets

CQCTRACK heavy-duty mining undercarriage components are trusted and exported with full confidence into markets that enforce the most stringent import quality and performance standards. Our Sumitomo and Case sprocket wheel assemblies, including the KWA0021, are actively supporting mining and heavy construction fleets across South America (Ecuador, Peru), Southern Africa, the Russian Federation, South Korea, and select high-end application segments in India. Our international distribution network further extends to the South Pacific island nations, Vietnam, Kazakhstan and the broader Central Asian corridor, Turkey, and North America. This broad and sustained global acceptance—spanning equatorial humidity, arid desert dust, and continental deep-freeze—demonstrates that CQC Track’s heat-treatment repeatability, dimensional precision, anti-corrosion packaging, and logistical reliability meet the universal requirements of 70-tonne-plus excavator fleets.

When you install a CQCTRACK Sprocket Wheel Assembly (Travel Motor Drive Wheel) on your Sumitomo SH700, Case CX700, CX700B, or CX750, you are engaging a component forged with the same manufacturing discipline that serves the world’s leading OEMs. Part number KWA0021 represents more than a direct drivetrain replacement—it represents a 20-year engineering partnership with the global mining and heavy construction industries, delivered by a team that understands that every hour of sprocket reliability translates directly into productive bench hours.

This article was authored by Jack of the CQC International Business Team, with sincere appreciation to Philip and Haily for their unwavering commitment to supplying premium undercarriage solutions to our worldwide Sumitomo and Case heavy equipment customers.