XCMG 414101929 XE800GK Track Bottom Roller Assembly/Heavy duty construction machinery chassis components source supplier-HAN GONG(DPW PARTS)
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Product Specifications
Technical Data Sheet: Heavy-Duty Track Bottom Roller Assembly for XCMG XE800GK Hydraulic Excavator
Document Identifier: XCMG-XE800GK-Bottom-Roller-Assy-HANGONG-DPW
Classification: Undercarriage Component | Track Roller | Construction Machinery
1. Executive Summary & Component Overview
This technical datasheet provides a detailed elaboration of the Track Bottom Roller Assembly (OEM Part Number: 414101929), a critical load-bearing component designed for the XCMG XE800GK hydraulic excavator. This specific model, the XE800GK, is engineered for heavy-duty construction, quarrying, and large-scale infrastructure projects. The bottom roller assembly plays a pivotal role in ensuring machine stability, mobility, and longevity by directly supporting the upper track frame and managing track chain dynamics. Sourced from HAN GONG and distributed under the DPW PARTS brand, this component represents a value-engineered aftermarket solution manufactured to meet rigorous performance standards, offering a reliable alternative for fleet maintenance and cost management.
2. Primary Function & Operational Role within the Crawler System
The Bottom Roller, or Carrier Roller, is a fundamental element of the excavator's undercarriage system, performing three essential mechanical functions:
Static and Dynamic Load Support: It bears a significant portion of the machine's operational weight, transferring loads from the track roller frame through the roller and onto the track chain, ultimately to the ground.
Upper Track Run Guidance and Sag Control: It supports the return (upper) run of the track chain, maintaining optimal track tension and sag. Correct sag is vital for minimizing vibration, reducing power loss in the final drive, and preventing excessive wear on sprockets and links.
Lateral Track Alignment: The integrated dual flanges act as guides for the inner edges of the track chain links, ensuring proper alignment and preventing lateral drift or derailment, especially during steering and counter-rotation operations.
3. Detailed Technical Specifications & Engineering Design
3.1. Applicability & OEM Reference:
Primary Machine Model: XCMG XE800GK Hydraulic Excavator.
OEM Part Number: 414101929. This number corresponds to the complete bottom roller assembly as specified by XCMG for this model.
Aftermarket Source: HAN GONG (Manufacturer), DPW PARTS (Distribution Brand).
3.2. Mechanical Design & Construction:
Type: Sealed and Lubricated (S&L) Bottom Roller.
Housing Material: Fabricated from high-strength, forged alloy steel (e.g., 50Mn, 40Mn2). The forging process ensures a superior metallurgical structure with high impact toughness and fatigue resistance.
Shaft: Manufactured from quenched and tempered alloy steel (e.g., 42CrMo), providing high tensile strength and excellent resistance to bending stresses. The shaft journals are precision-ground for optimal bearing fit and surface finish.
Flange Design: Robust, integral double flanges designed to withstand the abrasive wear from continuous contact with the track chain links.
3.3. Material Science & Metallurgy:
Base Material: Boron or Chromium-Manganese series alloy steels are typically used for their favorable hardenability and wear characteristics.
Heat Treatment Protocol:
Core Strength: The roller body undergoes Quenching and Tempering to achieve a strong, tough core structure (typical hardness 30-35 HRC), capable of absorbing high-impact shocks.
Surface Durability: The outer running surface and flange guides are treated with Induction Hardening. This process creates a deep, hardened case (effective depth 4-7mm) with a surface hardness of 55-60 HRC, delivering exceptional resistance to abrasive wear.
Surface Protection: The component is shot-blasted to improve paint adhesion and coated with a high-quality, corrosion-resistant paint system to protect against environmental degradation.
3.4. Bearing & Sealing System (The Core of Longevity):
Bearing Type: Utilizes a double-row tapered roller bearing configuration, selected for its high radial load capacity and ability to manage axial thrust loads.
Sealing System: Employs a multi-stage sealing assembly, typically combining:
Primary Seal: A floating face seal or a heavy-duty radial lip seal, creating the main dynamic barrier against contaminants.
Secondary Defenses: A labyrinth path and an external dust lip seal work in tandem to expel coarse abrasives and prevent the ingress of mud and water.
Lubrication: The internal cavity is pre-filled with a high-temperature, extreme-pressure (EP) lithium complex grease, ensuring continuous lubrication of the pin and bushing interface throughout the service interval.
4. Manufacturing Process & Quality Assurance at HAN GONG (DPW PARTS)
The production of this component by a manufacturer like HAN GONG involves a controlled, multi-stage process:
Material Selection & Forging: Certified steel billets are heated and forged into near-net-shape blanks, optimizing the material's grain flow for strength.
Precision Machining: CNC turning and boring centers machine the roller's outer diameter, flanges, and internal bore to achieve precise dimensional tolerances and geometric accuracy.
Controlled Heat Treatment: Components are processed through controlled atmosphere furnaces for quenching and tempering, followed by CNC-controlled induction hardening for precise case hardening on wear surfaces.
Clean-Room Assembly: Bearings and seals are assembled in a controlled environment to prevent contamination. The unit is then pressurized with grease to ensure complete cavity fill.
Comprehensive Quality Control:
Dimensional Inspection: CMM (Coordinate Measuring Machine) verification of all critical dimensions, including bore size, journal diameter, and flange geometry.
Hardness Verification: Rockwell and Brinell testing on case and core areas to confirm heat treatment specifications are met.
Performance Testing: Rotational torque and run-out testing to ensure smooth operation and verify seal integrity.
Documentation: Provision of material certificates and inspection reports for traceability and quality assurance.
5. Sourcing and Supply Chain Context
Manufacturer & Brand Identification: HAN GONG is a recognized manufacturer in the heavy machinery aftermarket sector. The brand DPW PARTS is their dedicated channel for distributing undercarriage components internationally. They specialize in producing compatible replacement parts that adhere to the original design specifications of major OEMs like XCMG.
Value Proposition: Sourcing this XCMG XE800GK Bottom Roller from HAN GONG via DPW PARTS provides a Cost-Effective and Reliable Alternative. It offers equipment owners and maintenance managers a solution that maintains machine performance and availability while optimizing the total cost of ownership, especially crucial for high-wear items like undercarriage components.
6. Key Technical Advantages Summary
Robust Load-Bearing Capacity: The forged steel construction and robust shaft are engineered to handle the dynamic loads of the XE800GK excavator.
Enhanced Wear Resistance: Induction hardened running surfaces significantly extend service life in abrasive working conditions.
Reliable Contamination Exclusion: The multi-stage sealing system is critical for protecting the bearing assembly, which is the key to maximizing component lifespan.
Precision Engineering for Compatibility: CNC machining ensures perfect fitment and alignment within the track roller frame, promoting smooth operation and preventing premature wear on adjacent components.
Assured Quality: Manufacturing under a certified quality management system ensures consistent performance and reliability, providing peace of mind to the end-user.
