Hyundai 81N623600 HX220L/R220 190pitch-45L Track Link Assembly-Mining quality heavy duty excavator chassis component-manufatured by dpwparts(HAN GONG)
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Product Specifications
Hyundai 81N623600 HX220L/R220 190mm Pitch-45L Track Link Assembly – Technical Specification & Product Overview
Product Identity & Application
The Hyundai 81N623600 is a heavy-duty Track Link Assembly (complete track chain) engineered for Hyundai HX220L and R220 series excavators deployed in severe-service applications, including mining, quarrying, and heavy construction. This assembly features a 190mm chain pitch and a configuration of 45 links (45L), defining its length and compatibility with the specific undercarriage frame of the target machine. Manufactured to mining-quality specifications by DPWParts (HAN GONG), this component is designed to deliver exceptional durability, reduced wear rates, and extended service intervals under high-load, high-abrasion operating conditions.
Detailed Structural Composition & Design Features
Each Track Link Assembly is a critical, series-connected system of forged and machined components. The 190mm pitch indicates a robust design balance between strength and ground contact dynamics for a 22-ton-class excavator.
Track Links (Side Links):
Material: Fabricated from high-tensile, micro-alloyed boron or chromium-manganese steel (e.g., 40MnB, 35CrMn) through precision closed-die forging. This process aligns the metal grain structure with the part's contours, optimizing impact strength and fatigue resistance.
Design & Machining: Each link is a rugged forging with precisely machined critical zones:
Bushing Interference Bore: A machined and honed bore designed for a permanent press-fit installation of the track bushing, ensuring no rotational movement.
Pin Running Bore: The adjacent bore, which serves as the precise running surface for the track pin from the adjoining link.
Side Rail/Guide Flange: The elevated, hardened vertical section that guides the track chain along the rollers and idler, maintaining lateral alignment.
Seal & Retainer Grooves: Machined grooves to house the multi-layered sealing system and high-strength retainer rings.
Track Bushing (Outer Sleeve):
Material: Manufactured from carburizing steel (e.g., 20CrNi2Mo). The outer surface undergoes deep case carburization or induction hardening to achieve a surface hardness of HRC 58-62, providing extreme resistance to sprocket tooth abrasion.
Function: As the press-fit outer race of the chain joint, its hardened outer surface engages with the sprocket, while its precision-ground inner surface rotates around the track pin.
Track Pin (Connecting Pin):
Material: Made from high-grade alloy steel (e.g., 42CrMo4), quenched and tempered to achieve an optimal balance of high core toughness (resisting bending and shear failure) and a hardened surface for wear resistance.
Function: Acts as the central axle, connecting two adjacent links. It is stationary within one link's pin bore but rotates inside the bushing of the connecting link, facilitating articulation.
Advanced Sealing & Lubrication System (Sealed and Lubricated Type):
Multi-Stage Seal Assembly: Incorporates a combination of:
Nitride Rubber O-Rings: Provide the primary elastic sealing force.
Polyurethane (PU) or Teflon®-Reinforced Face Seals: Act as dynamic, wear-resistant dust lips that scrape contaminants away.
Metal Seal Rings: Serve as rigid load-bearing components within the seal stack.
Lubrication Channel: The sealed cavity between the pin and bushing is packed with high-viscosity, extreme-pressure (EP) lithium soap grease. This permanent lubrication minimizes internal wear and corrosion.
High-Reliability Retainers: Precision-engineered, heat-treated snap rings or end caps are installed under high pressure to axially secure the entire pin-bushing-seal assembly, preventing disassembly under operational vibrations.
Dimensional Integrity: The 45-link count and 190mm pitch are held to tight geometric tolerances (±0.3mm cumulative pitch error) to ensure proper sprocket meshing, smooth rolling over carrier rollers, and correct track tension, thereby minimizing power loss and component stress.
Mining-Quality Enhancements & Manufacturing Process (DPWParts/HAN GONG)
Material Science: Selection of alloy steels with enhanced levels of carbide-forming elements (Cr, Mo) to improve hardenability and depth of effective hardness for sustained performance in abrasive environments.
Precision Forging & Heat Treatment: Utilizes fully automated, CNC-controlled forging lines and heat treatment furnaces. Processes like controlled atmosphere carburizing and deep freezing (sub-zero treatment) are employed to stabilize the microstructure, resulting in superior wear characteristics and dimensional stability.
Automated Machining: CNC turning and boring centers ensure micron-level accuracy on all functional diameters and bore concentricities, which is critical for load distribution and seal life.
Comprehensive Quality Assurance (HAN GONG):
Incoming Material Inspection: Spectroscopic analysis to verify chemical composition.
In-Process Inspection: Dimensional checks with go/no-go gauges and CMM for critical links.
Non-Destructive Testing (NDT): Magnetic particle inspection for surface cracks and ultrasonic testing for internal forging defects.
Final Performance Audit: Hardness testing (Rockwell and Brinell) across multiple points on pins, bushings, and links to validate heat treatment consistency.
Performance Options: May offer hardfaced link rails (with tungsten carbide overlay) as an upgrade for severely abrasive conditions like decomposed granite or volcanic rock.
Performance Characteristics & Compatibility
High Dynamic Load Capacity: Engineered to withstand the shock loads from the HX220SL/R220's breakout forces, climbing, and side-slope travel.
Optimized Wear Life: The combination of hardened components and a contaminant-excluding sealing system significantly extends the internal and external wear life compared to standard-duty chains, reducing cost-per-hour.
Direct OEM Replacement: The 81N623600 assembly is manufactured to meet or exceed the original dimensional and performance specifications of the genuine Hyundai® part, guaranteeing perfect fit and function without machine modification.
About the Manufacturer: DPWParts (HAN GONG)
HAN GONG is a specialized, vertically integrated manufacturer of undercarriage components for construction machinery. Supplying the global aftermarket under brands like DPWParts, the company operates modern facilities equipped with advanced forging, machining, and heat treatment lines. HAN GONG adheres to ISO 9001 quality management systems and employs a rigorous, full-process manufacturing approach—from steel sourcing to final assembly—ensuring complete quality control and traceability. Their products are recognized for providing a reliable, high-value performance alternative in the heavy-duty replacement parts sector.
