HYUNDAI 81EH-20010 R380-HX400 Track Link AS-216pitch-51L/Mining quality-heavy duty excavator construction machinery parts manufacturer&supplier-cqctrack(HELI)

HYUNDAI 81EH-20010 R380-HX400 Track Link Assembly AS 216-Pitch-51L) – Technical Specification & Product Overview

Product Identification & Machine Compatibility
The HYUNDAI 81EH-20010 is a premium-grade Track Link Assembly (Complete Track Chain) engineered for HYUNDAI R380 and HX400 large hydraulic excavators. This assembly is characterized by a 216mm (8.5-inch) pitch and a total length of 51 links, making it a direct replacement for the original equipment (OEM) part. Manufactured to Mining & Heavy-Duty quality standards by CQCTrack (HELI), this component is designed to deliver exceptional durability and extended service life in the most demanding applications, including mining, major excavation, and heavy construction projects.

Detailed Technical Construction & Design

This assembly is a precision-engineered system of interconnected, high-integrity components that form one side of the excavator’s crawler track.

1. Forged Track Links (Master Links):
   • Material: Fabricated from superior alloy steel forgings (typically grades such as 40Mn2 or 35MnBh). The forging process aligns the metal grain structure to the part’s contour, significantly enhancing tensile strength and impact resistance.
   • Critical Machined Features:
     • Bushing Bores: Precision-honed cylinders at each end for the interference-fit installation of the track bushing.
     • Pin Bores: Accurately machined to house the track pin, maintaining strict parallelism and center distance.
     • Sidebars/Rails: The elevated guiding surfaces that maintain track alignment on rollers and idlers, preventing derailment.
     • Seatings for Retainers: Machined grooves or counterbores to securely lock the seal and pin retention system.
2. Track Bushing (Outer Sleeve):
   • Material & Treatment: Made from chromium-molybdenum alloy steel (e.g., 20CrNi2Mo). The outer surface undergoes carburizing or induction hardening to achieve a surface hardness of HRC 58-65, providing maximum resistance to sprocket tooth wear.
   • Function: As the primary interface with the drive sprocket, its hardened surface ensures efficient power transmission and long-term wear performance.
3. Track Pin (Connecting Pin):
   • Material & Properties: Manufactured from high-tensile alloy steel (e.g., 42CrMo), through-hardened and tempered. This process yields a tough, ductile core capable of withstanding high bending and shear forces, with a hardened surface to resist wear inside the bushing.
   • Function: Acts as the rotating hinge pin, connecting adjacent links and allowing for articulation.
4. Advanced Sealing & Lubrication System (Sealed & Lubricated Chain):
   • Multi-Stage Sealing: Incorporates a combination of nitrile rubber (NBR) O-rings and polyurethane (PU) dust seals. This multi-labyrinth design effectively excludes abrasive contaminants (fine sand, clay, rock dust) and retains lubricant.
   • Internal Lubrication: The sealed chamber between the pin and bushing is filled with high-temperature, extreme-pressure (EP) lithium-complex grease. This continuous lubrication minimizes internal friction and wear, reducing power loss and heat generation.
   • Secure Retention: High-grade alloy steel snap rings or engineered end caps are used to axially secure the entire pin-bushing-seal assembly, ensuring structural integrity under high loads.

Mining-Quality Design & Manufacturing Excellence by CQCTrack (HELI)

• Enhanced Durability Specifications: Exceeds the material and hardness specifications of standard-duty chains, offering up to 25-35% longer expected service life in severe abrasion environments.
• Full-Process Manufacturing Control: CQCTrack (HELI) oversees the entire production cycle:
  • Closed-Die Forging: For optimal structural strength.
  • CNC Machining: For micron-level precision in all critical dimensions.
  • Computer-Controlled Heat Treatment: Utilizing atmosphere-controlled furnaces for consistent and deep case hardening.
  • Automated Induction Hardening: For precise hardening of localized wear areas like bushing surfaces.
• Rigorous Quality Assurance Protocol:
  • Raw material spectroscopic analysis.
  • Ultrasonic and magnetic particle inspection of forgings.
  • Hardness testing (surface and core) and case depth verification.
  • Final dimensional audit using precision gauges and CMM to ensure 216mm pitch accuracy and 51-link total length conformity.
• Optional Hardfacing: Available for extreme conditions, where tungsten carbide overlays can be applied to link sidebars for additional protection against grinding wear.

Performance Advantages & Application

• Optimized for High Loads: Designed to handle the dynamic stresses and breakout forces generated by the 38-40 ton class HYUNDAI R380/HX400 excavators.
• Superior Contamination Resistance: The robust sealing system is critical for mining and quarry applications, where premature pin and bushing wear often starts with seal failure.
• Precision Compatibility: The 81EH-20010 assembly guarantees perfect fitment, correct track tension, and smooth engagement with the machine’s sprocket, rollers, and idlers, ensuring optimal stability and traction.
• Cost-Effective Reliability: Offers a high-value, performance-driven alternative to the OEM part, maximizing machine availability and reducing cost-per-hour in severe duty cycles.

About the Manufacturer: CQCTrack (HELI)
CQCTrack is the specialized undercarriage manufacturing arm of the HELI Group, a globally recognized leader in material handling and engineering machinery. With dedicated foundries, forging lines, and fully integrated machining facilities, CQCTrack specializes in producing heavy-duty undercarriage components for global markets. Adhering to ISO 9001:2015 quality management systems, the company is renowned for its vertical integration, technological investment, and commitment to delivering products that meet or exceed international performance standards.

Conclusion
The HYUNDAI 81EH-20010 Track Link Assembly (216-Pitch, 51-Links) from CQCTrack (HELI) stands as a critical, mining-grade chassis component engineered for peak performance under extreme operational stress. Its superior forged construction, precision manufacturing, advanced sealed lubrication, and rigorous quality control make it a reliable and durable choice for owners and operators of HYUNDAI R380 and HX400 excavators seeking to enhance undercarriage life, minimize downtime, and optimize total operating costs in heavy-duty and mining applications.