Atlas Copco PV235 / DML-1200 Track Lower Roller Group (P/N: 2658318513, 57717480, 2657717480) – OEM- Grade Undercarriage Parts by CQC Track

In surface mining and large-scale quarrying, the crawler drill rig’s undercarriage absorbs an unrelenting combination of static tonnage and dynamic shock as the mast indexes from hole to hole across fractured benches. The Track Lower Roller Group, specifically engineered for the Atlas Copco PV235 and DML-1200 blasthole drill rigs, is the primary weight-bearing element that keeps the track frame aligned and the machine mobile. CQC Track, the specialized undercarriage division of CQC International, delivers a premium replacement Lower Roller Group that maps directly to Atlas Copco genuine part numbers 2658318513, 57717480, and 2657717480. This is not a catalog afterthought; it is a purpose-manufactured assembly backed by two decades of iterative engineering and an active OEM supply legacy. This technical overview, authored by Jack with global commercial support from Philip and Haily, demonstrates why demanding mining and construction operations worldwide trust CQC Track for their crawler drill rig undercarriage components.

1. The Manufacturer’s Core Advantage: Embedded OEM Production Capability

The true measure of a manufacturer is the company they keep. CQC Track’s production facility is deeply integrated into the global heavy equipment supply chain as a certified OEM manufacturing base. Our factory currently produces complete undercarriage assemblies for Hitachi, Kobelco, LiuGong, XCMG, and SDLG. This means that every lower roller we manufacture—including the Atlas Copco PV235/DML-1200 group—is processed through the same validated manufacturing cells, the same heat-treatment furnaces, and the same quality gating systems that serve Japanese, Korean, and Chinese OEMs. The operational discipline, metallurgical traceability, and dimensional capability required for such partnerships are not aspirational targets; they are daily production realities. With CQC Track, the aftermarket receives the same engineering integrity delivered to the assembly lines of global brands.

2. Technical Architecture of the Lower Roller Group: Engineered for Extreme Wear

A lower roller’s service life is predetermined by its foundational materials and the precision with which they are treated. The CQC Track PV235/DML-1200 Lower Roller Group is constructed from a series of deliberately specified and sequentially processed elements:

• Forged Alloy Steel Wheel Body: The roller shell originates as a solid round bar of high-grade alloy steel. Hot forging shapes the preform while aligning the material’s internal grain flow circumferentially around the load axis, providing exceptional resistance to spalling and fatigue crack propagation under high-cycle loading.
• Complete Thermal Refinement: Prior to finish machining, the entire forged wheel body undergoes a through quenching and tempering cycle. This integral heat treatment imparts a uniform, tempered martensitic core microstructure that combines high tensile strength with essential toughness. Only after this thermal foundation is established do the components proceed to rough machining and precision CNC finishing.
• Wear Surface Armor via Induction Hardening: The tread and guide-flange contact faces receive a focused medium-frequency induction hardening (MF quenching) process. This creates a deep, hardened case with a surface hardness tightly controlled within 55–62 HRC. The result is a wear face that defeats abrasive grooving and plastic deformation in sharp, fragmented rock, while the softer, tempered core prevents brittle fracture under impact.
• Dual-Seal-Groove Shaft and Elite Sealing System: The stationary shaft is ground with a precise dual seal groove profile, forming the inner half of a labyrinth that interfaces with a top-tier duo-cone floating seal. This face-to-face metal-on-ceramic-elastomer seal configuration is the global standard for absolutely excluding water, sand, and fine abrasive slurry. The internal cavity is factory-filled with a specially blended low-temperature-resistant anti-freeze grease, guaranteeing immediate hydrodynamic lubrication and corrosion protection at startup, even after prolonged idling in arctic conditions.
• Spheroidal Graphite Iron Side Covers: The sealing side covers are produced through a spheroidal graphite (ductile iron) casting process. This material offers the ideal bearing surface for the floating seal O-rings and absorbs assembly stresses without distortion, maintaining a lifetime seal compression.

3. Twenty Years of Process Perfection, Validated in Global Extreme Mining

A theoretical design must prove itself in the field. Over our 20-year manufacturing trajectory, the CQC Track Lower Roller Group has been continually refined through a closed-loop feedback system that incorporates failure mode analysis from active mine sites. Our rollers have been subjected to the abrasive silica dust of gold mines in South Africa, the high-altitude volcanic rock of the Andes in Peru, the sub-zero iron ore pits of Russia, and the tropical laterite foundations of Vietnam. Every metallurgical adjustment—from optimizing the tempering temperature to eliminate residual austenite to fine-tuning the induction hardening scan rate for consistent case depth—has been driven by this hard field data. The reliability and quality stability you experience today are the direct result of millions of operating hours logged and analyzed across the planet’s most severe undercarriage environments.

4. A Holistic Undercarriage Parts Ecosystem

Recognizing that a failing lower roller accelerates wear on the entire track chain, CQC Track provides a fully synchronized range of related undercarriage parts for the Atlas Copco PV235 and DML-1200 rigs. Our production program includes matched track link assemblies with induction-hardened pins and bushings, front idler groups, segmental drive sprocket rims, and upper carrier rollers. All components are manufactured within a common metallurgical and thermal envelope, ensuring uniform wear rates across the undercarriage system. The CQC International business team—Philip, Jack, and Haily—is structured to deliver complete kit-based solutions, simplifying procurement and eliminating the operational risk of mixing incompatible aftermarket sources.

5. Global Export Reach into High-Specification Markets

CQC Track undercarriage components have earned market access into some of the world’s most quality-sensitive territories. Our Atlas Copco PV235/DML-1200 Lower Roller Groups are in active service across South America (Ecuador, Peru), Southern Africa, the Russian Federation, South Korea, and high-end application segments in India. Our distribution network further penetrates the South Pacific island nations, Vietnam, Kazakhstan and the wider Central Asian corridor, Turkey, and North America. This consistent global acceptance across diverse regulatory and climatic zones is strong evidence of a product whose material integrity, anti-corrosion packaging, and operational predictability meet universal mining industry standards.

When you specify the CQC Track Lower Roller Group for your Atlas Copco PV235 or DML-1200 drill, you install a component forged within the same ecosystem that supplies the world’s leading OEMs. Part numbers 2658318513, 57717480, and 2657717480 represent more than a replacement part; they represent a 20-year engineering alliance with the mining and quarrying industries, delivered by a team that understands undercarriage reliability as a production imperative.

Authored by Jack of the CQC International Business Team, with sincere thanks to Philip and Haily for their ongoing commitment to our global undercarriage service network.