ATLAS- COPCO DRILLING RIG DM30 / 2310035251 Track Lower Roller Assembly – cqctrack: Dedicated to the R& D and Manufacturing of Crawler Undercarriage Components

On a blast-hole drill rig like the Atlas Copco DM30, the undercarriage serves a different master than an excavator’s. It must provide a rock-steady platform during long drilling cycles while enduring the relentless high-frequency vibrations transmitted from the mast. The track lower roller assembly, part number 2310035251, is the fundamental load-bearing interface that keeps the machine stable, level, and mobile when tramming between bench patterns. CQCTrack, a manufacturer wholly dedicated to the research, development, and production of crawler undercarriage components, engineers this roller to a specification that acknowledges both the static demands of drilling and the dynamic loads of mine-site travel. With a manufacturing facility that simultaneously serves as the OEM undercarriage production base for Hitachi, Kobelco, LiuGong, XCMG, and SDLG, the 2310035251 roller emerges from a quality culture designed for the most severe mining class applications.

1. Manufacturing Core Strength and OEM Production Reality
CQCTrack’s authority in producing the DM30 lower roller assembly is not aspirational—it is operational. Our factory floor runs concurrent OEM programs, manufacturing track rollers, idlers, sprockets, and chains for Hitachi, Kobelco, LiuGong, XCMG, and SDLG. This means that every process control, metallurgical standard, and dimensional tolerance demanded by Japanese and Chinese heavy equipment leaders is ingrained in the way we build the Atlas Copco drill rig roller. The same forging simulation software, the same heat treatment furnaces with multi-zone temperature control, and the same seal assembly clean rooms are shared across all OEM and direct-wholesale production. For the drilling contractor who demands that a track roller does not fail catastrophically on a remote bench, this shared OEM infrastructure is the ultimate assurance of repeatable, measurable quality.

2. Technical Product Description: The 2310035251 Roller Engineered for Drilling Stability
The CQCTrack track lower roller assembly for the Atlas Copco DM30 is built as a sealed, lifetime-lubricated cartridge. Every material and process has been selected to combat the specific failure modes that afflict roller assemblies on rotary drilling rigs:

• Roller Shell: Forged from hot-rolled alloy round steel bar stock. The hot forging process closes internal voids and aligns the grain flow continuously around the tread profile, delivering a monolithic shell that resists the micro-cracking and spalling which can initiate from the intense, sustained vibration of rotary drilling. A forged shell also provides superior structural stiffness, helping maintain precise roller-to-rail alignment under the DM30’s weight.
• Side Covers (End Caps): Produced via spheroidal graphite cast iron (ductile iron) casting. The nodular graphite morphology embedded in a strong ferritic-pearlitic matrix gives these covers a high degree of impact toughness and resistance to lateral thrust. This is critical when the drill rig is trammed across uneven shot rock, subjecting the roller to side-loads that could crack a conventional brittle iron cover.
• Shaft: Manufactured from high-grade alloy steel with a dual-seal-groove configuration. Each groove is finished to a precise surface roughness specification, providing the ideal counterface for the floating seal rings. The shaft ends that press into the side covers are held to tight interference tolerances, creating a rigid, permanent assembly that will not loosen even under continuous vibratory input.
• Sealing System & Lubrication: We install only top-tier, double-cone floating seals sourced from premier global seal manufacturers. These seals form a metal-to-metal face contact that is self-replenishing and impervious to the fine rock dust generated during drilling. The internal cavity is filled with a specialized anti-freeze extreme-pressure grease. This lubricant is formulated to remain in place and not channel away during long static drilling periods, while also providing immediate boundary lubrication when the machine begins tramming in sub-zero morning conditions.
• Heat Treatment Protocol — The Foundation of Wear Resistance:
  1. Overall Quenching & Tempering: The forged roller shell undergoes a full-body quench and high-temperature temper. This process transforms the microstructure into a uniformly refined, tough matrix known as tempered sorbite or bainite, depending on the steel grade. It eliminates residual forging stresses and creates a strong, fatigue-resistant core that can absorb millions of load cycles without deformation.
  2. Rough Machining & Precision Finishing: After the quench-and-temper cycle stabilizes the material, the shell is rough-turned to near-net shape, then transferred to CNC lathes for finish machining of the tread surface and internal bearing bores. This sequencing ensures that the final dimensions are not distorted by subsequent heat treatment, resulting in a roller that runs true and concentric.
  3. Overall Induction Hardening (Final Case): The completely machined shell is then subjected to a controlled medium-frequency induction hardening process. The entire tread and flange surfaces are rapidly heated and quenched, creating a deep, uniform hardened case. The surface hardness is tightly maintained between 55 and 62 HRC. This deep case depth provides exceptional resistance to abrasive wear from drill cuttings and sharp fractured rock, while the tough, tempered core prevents brittle shell fracture. The result is a roller that maintains its diameter and profile for extended service intervals, preserving track chain pitch and undercarriage geometry.

3. Twenty-Year Process Evolution, Field-Certified in Global Mining Environments
The production of this DM30 roller assembly is the culmination of 20 years of continuous process improvement at CQCTrack. Our engineering database captures decades of field data, which has led to permanent refinements such as optimized alloy micro-additions for through-hardenability, refined forging temperatures to maximize grain refinement, and precisely profiled induction coils that ensure uniform case depth around the entire roller circumference.
The reliability of this component has been repeatedly validated in the most demanding mining and quarrying conditions. CQCTrack roller assemblies are currently in service on drill rigs operating in the abrasive, silica-rich copper and gold mines of Ecuador and Peru; on the high-bench hard-rock formations of South Africa; in the frozen, ice-bound overburden of Russian and Kazakhstani open-pit mines; and across the high-humidity, corrosive environments of South Pacific island quarries. In every location, the 2310035251 roller has proven its ability to resist vibration-induced loosening, seal failure, and tread spalling, enabling predictable maintenance scheduling and minimizing unscheduled downtime on critical drilling equipment.

4. Related Undercarriage Component Production
CQCTrack does not produce the lower roller in isolation. As a comprehensive undercarriage systems manufacturer, we concurrently produce the full range of mating crawler components for the Atlas Copco DM30 platform, including the front idler assemblies, top carrier rollers(2310035269) built with the same floating seal technology, drive sprockets with induction-hardened tooth profiles, and fully assembled track chains with heat-treated pins and bushings. This integrated manufacturing capability allows drilling contractors to source a completely balanced, metallurgically compatible undercarriage system from a single, quality-controlled source, eliminating the accelerated wear caused by mismatched aftermarket parts.

5. Direct Global Wholesale Distribution
CQCTrack’s export network delivers the DM30 roller assembly and complete undercarriage kits directly to wholesale buyers, mining groups, and drilling contractors across the continents:

• South America: Consistent supply to mining operations in Ecuador, Peru, and the broader Andean region.
• Africa: Ruggedized components for South Africa’s hard-rock and open-cast mines.
• Russia & Central Asia: Cold-climate-ready parts for Russia, Kazakhstan, and other CIS mining territories.
• Premium Asia-Pacific Markets: High-quality undercarriage exports to South Korea, the Indian high-end mining sector, Vietnam, and the South Pacific island nations.
• North America & EMEA: Direct shipments to distributors in North America and to quarry and mining contractors in Turkey and beyond.
  Our international business team is structured to handle the logistics and documentation requirements of site-critical drill rig parts, ensuring that a replacement roller reaches a remote bench with minimal delay.

CQC International Business Team: Philip | Jack | Haily
This product document has been personally authored and technically verified by Jack from the CQCTrack Global Business Division, drawing directly from current R&D specifications and verified field performance data for the Atlas Copco DM30 / 2310035251 track lower roller assembly.