CASE SUMITOMO CX300/ CX350/ SH350/ CX370/ CX380 Track Lower Roller Assembly (KSA0835, KSA15450, KSA13230) – Heavy- Duty Undercarriage Solution by Heli Machinery Manufacturing Co., Ltd. (cqctarck)

Engineered for extreme mining and heavy construction, Heli Machinery delivers OEM-grade CASE excavator lower roller assemblies for CX300, CX350, SH350, CX370, and CX380 models. Discover forged alloy steel durability, dual-seal protection, and 20 years of field-proven performance across six continents. Authored by Jack of the CQC International Business Team.

Heli Machinery Manufacturing Co., Ltd. – The Hidden Force Behind Global Undercarriage Performance

In the demanding world of tracked heavy equipment, the longevity of an excavator’s undercarriage defines operational cost and uptime. Heli Machinery Manufacturing Co., Ltd., operating under the international trade brand cqctarck, stands as a specialized, high-tier manufacturer of heavy-duty tracked chassis parts. Our core competence is not simply replicating part numbers; it is engineering longevity into every component through OEM-aligned manufacturing excellence. Today, Heli Machinery is a trusted behind-the-scenes manufacturing partner for some of the most respected names in the industry, including Hitachi, Kobelco, LiuGong, XCMG, and SDLG. This OEM supply heritage means that when you source a CASE lower roller assembly from us, you receive a component built to the exacting standards of factory production lines, often exceeding the performance of general aftermarket alternatives.

The focus of this technical overview is our premium Track Lower Roller Assembly, engineered specifically for CASE CX300, CX350, SH350, CX370, and CX380 excavators, corresponding to OEM reference numbers KSA0835, KSA15450, and KSA13230. This component is a direct reflection of our two-decade commitment to metallurgical precision and seal integrity in the world’s toughest digging environments.

Engineering Anatomy: Forged, Cast, and Heat-Treated for Extreme Abrasion

A lower roller is only as good as its ability to resist wear, impact, and lubricant contamination. Our assembly begins with raw material selection that defies conventional cost-cutting approaches:

• Monoblock Roller Body: The roller shell is hot-forged from high-grade alloy round steel. Forging aligns the grain flow circumferentially, eliminating the porosity and stress fractures common in cast rollers. This delivers substantially higher impact toughness when the machine traverses blasted rock or uneven hard-bench terrain.
• Side Cover Metallurgy: The side covers are manufactured through a ductile iron casting process (spheroidal graphite casting), which provides superior structural damping and crack resistance. The covers are precisely machined to form the outer boundary of the floating seal housing.
• Advanced Shaft & Sealing System: The shaft features a precision-ground dual seal groove configuration. This design accommodates a pair of top-tier floating metal face seals arranged in a back-to-back formation. We utilize only premium-brand floating seals whose elastomeric O-rings maintain consistent contact pressure throughout the roller’s lifetime. This dual-seal fortress eliminates internal lubricant leakage and blocks the ingress of water, sand, and abrasive slurry.
• High-Stability Lubricant Pack: The internal reservoir is packed with a specially formulated anti-freeze, extreme-pressure grease. This lubricant remains pumpable and adhesive in both arctic permafrost and tropical mining pits, guaranteeing immediate boundary layer protection on every rotation from cold start-up to peak load.

Proprietary Heat Treatment: The 55-62 HRC Advantage

What truly separates Heli Machinery components from fatigue failures is our multi-stage thermal refinement. We do not take shortcuts. The entire forged roller body first undergoes a full quenching and tempering treatment, normalizing the core structure for ultimate ductility. This is followed by rough machining, which removes surface decarburization, and then a final finish machining stage. Only at this point does the roller tread and flange surface receive our proprietary medium-frequency induction hardening. This targeted process yields a consistent case hardness of 55 to 62 HRC, producing a deep, wear-resistant case over a shock-absorbent, ductile core. The result is exceptional resistance to abrasive scalloping and flange peening, dramatically extending service intervals in high-silica sand, granite, and iron ore applications.

20 Years of Iterative Refinement, Validated on Six Continents

The current-generation CASE roller assembly is not a catalog copy; it is a product of 20 years of continuous tribological evolution. Our in-house engineering team has relentlessly advanced our forging die geometry and seal groove tolerances based on failure-mode analysis from the field. Before any production batch is released, its design DNA has been battle-proven in the most unforgiving global classrooms: underground adits in Peru, open-pit copper mines in Chile, alluvial diamond fields in South Africa, frost-shattered permafrost mining in Siberia and Kazakhstan, and the volcanic abrasive quarries of the South Pacific island nations. This accumulated field intelligence ensures that the structural stability and seal reliability of every KSA0835/KSA15450/KSA13230 assembly meets a standard that general manufacturers cannot replicate.

A Complete Undercarriage Ecosystem

One of Heli Machinery’s distinct competitive advantages is our ability to supply a fully matched undercarriage system. As a manufacturer who internally produces the entire chain, we guarantee component synergy. Our cqctarck division can simultaneously provide complementary running gear, including:

• Track Link Assemblies with induction-hardened pin and bushing interfaces
• Top Carrier Rollers engineered for reduced vibration
• Front Idler Assemblies with heavy-walled hub castings
• Drive Sprockets precision-cut for CASE final drive mounting profiles

This holistic production capability means mixed-source quality compromises are eliminated, and our single-source OEM traceability standard is maintained across the entire tracked chassis.

Global Footprint and High-End Market Penetration

Heli Machinery’s cqctarck brand has successfully transcended budget-driven markets to become a high-end replacement solution in quality-critical economies. Our CASE excavator track rollers are systematically exported to and authenticated by industrial end-users in:

• South America: Ecuador, Peru, and wider Andean mining regions.
• Africa: South African platinum and gold reef operations.
• CIS & Central Asia: Russian taiga logging, Kazakhstan mineral extraction.
• Asia-Pacific: South Korean port demolition fleets, high-demand stone quarries in India, and the robust infrastructure projects across Vietnam.
• South Pacific: Seaboard construction and mining in archipelagic nations.
• North America: High-hour aggregate and pipeline applications.
• MENA & Europe: Rigorous Turkish infrastructure and quarrying fleets.

This geographic diversity is the ultimate testament to the roller’s universal compatibility with extreme conditions.

This technical product profile has been researched and authored by Jack of the CQC International Business Team.
*For detailed technical data sheets, material certifications, and deployment references for the CASE CX300/CX350/SH350/CX370/CX380 lower roller assemblies, connect with our global trade specialists:*

• Philip
• Jack
• Haily

Heli Machinery Manufacturing Co., Ltd. – cqctarck
Precision-Forged Undercarriage Components for a Moving Planet.