Doosan Excavator 200104-00017A Dx55 Dx60 Track Bottom Roller Support Roller Assembly manufactured by cqctrack at quanzhou

Doosan Excavator 200104-00017A DX55 DX60 Track Bottom Roller / Support Roller Assembly

Product Category: Excavator Undercarriage Components / Tracked Chassis Parts
Applicable Models: Doosan DX55, Doosan DX60 Mini Excavators
OEM Reference Number: 200104-00017A
Component Type: Track Bottom Roller / Track Support Roller Assembly
Certification: CQC (China Quality Certification), ISO 9001:2015
Manufacturer: CQCTRACK (HELI MACHINERY MANUFACTURING CO., LTD.), Quanzhou, China

1. Product Overview: Precision Undercarriage Engineering for Doosan Compact Excavators

The Doosan Excavator 200104-00017A Track Bottom Roller Assembly is a precision-engineered undercarriage component specifically designed for the Doosan DX55 and DX60 mini excavator series . This critical load-bearing element, alternatively termed Track Support Roller or Lower Roller, forms an integral part of the crawler track system, responsible for distributing the machine’s operating weight across the track chain while maintaining precise alignment during travel and operation .

Manufactured by CQCTRACK (HELI MACHINERY MANUFACTURING CO., LTD.) , a professional manufacturer of tracked chassis parts based in Quanzhou, China, this assembly represents the culmination of over 20 years of specialized experience in undercarriage component production . As one of the top three undercarriage manufacturers in the Quanzhou region—a key industrial hub for construction machinery manufacturing in Fujian Province—CQCTRACK has established itself as a proficient OEM (Original Equipment Manufacturer) and ODM (Original Design Manufacturer) partner serving the global aftermarket .

This track roller assembly is engineered to OEM quality standards and certified under CQC (China Quality Certification) , ensuring 100% interchangeability with the original Doosan component while offering the cost-effectiveness of direct factory sourcing .

2. Cross-Model Compatibility and Machine Specifications

2.1 Applicable Doosan Models

The 200104-00017A track roller assembly is specifically engineered for the following Doosan compact excavator models:

The Doosan DX55 and DX60 mini excavators are renowned for their compact design combined with robust performance, featuring Doosan-engineered hydraulic systems and high-strength steel construction that ensures structural durability in demanding environments . These machines typically feature crawler-type undercarriages with superior traction on uneven terrain, making them ideal for confined urban worksites and sensitive ground applications .

2.2 Part Number Specifications

For accurate cross-reference verification, it is recommended to confirm your machine serial number or provide the original part for physical confirmation before ordering.

3. Engineering Specifications and Material Composition

3.1 Metallurgical Foundation

The 200104-00017A track roller assembly is manufactured from premium-grade alloy steels, specifically selected for their ability to withstand the combined stresses of compressive loading and continuous operation in demanding environments .

Material Specifications:

The use of 50MnB steel provides an optimal balance of wear resistance and toughness, essential for mini excavator applications where space constraints require compact yet durable components .

3.2 Thermal Treatment Parameters

The exceptional durability of these track rollers derives from sophisticated heat treatment processes that create a wear-resistant exterior while maintaining a tough, shock-absorbing core :

CQCTRACK’s advanced heat treatment lines feature computer-controlled induction hardening and tempering furnaces, enabling the achievement of deep, uniform case hardness with a tough, ductile core—a critical factor for component longevity .

3.3 Dimensional Specifications

All critical dimensions are verified using Coordinate Measuring Machines (CMM) and precision gauges during final inspection to ensure 100% interchangeability with OEM specifications .

3.4 Core Bearing and Seal Technology

The integrity of the internal bearing system represents the performance heart of the assembly, where CQCTRACK applies its engineering expertise :

Bearing System:

Multi-Stage Seal System:

This advanced sealing technology is critical for preventing premature failure in the demanding environments where mini excavators operate, ensuring that dirt and grime cannot penetrate the bearing system .

4. Manufacturing Quality Assurance and CQC Certification

4.1 Quality Management System

As a professional manufacturer of tracked chassis parts, CQCTRACK (HELI MACHINERY MANUFACTURING CO., LTD.) operates under a comprehensive Quality Management System certified to ISO 9001:2015 and validated by CQC (China Quality Certification) . This certification ensures that every track roller assembly meets or exceeds the quality standards required for critical excavator applications.

The CQC (China Quality Certification) mark demonstrates compliance with Chinese national standards and international quality requirements, providing assurance to global customers that components are manufactured to consistent, verifiable quality levels .

4.2 Integrated Production Workflow

CQCTRACK’s manufacturing prowess is built on complete vertical integration and controlled, sequential processes developed over more than 20 years of specialization :

Stage 1: Raw Material Verification

• Spectrographic analysis of alloy composition (50MnB/50Mn verification)
• Ultrasonic testing for internal defects
• Mechanical property verification (tensile, yield, elongation)
• Full material and process traceability maintained for every production batch

Stage 2: Precision Forging

• Closed-die forging ensuring optimal grain flow and material density
• Temperature-controlled forging parameters
• Strategic control of grain orientation following component stress contours
• Normalizing to relieve forging stresses

Stage 3: Heat Treatment

• Computer-controlled induction hardening with precise temperature profiling
• Hardness testing at multiple points (HRC 52-58 verification)
• Case depth verification through macro-etching and micro-hardness testing
• Metallurgical analysis for grain structure confirmation

Stage 4: Finish Machining

• CNC lathe operations with CMM (Coordinate Measuring Machine) verification
• Bore grinding to precise H7 tolerance
• Flange profile machining for optimal chain engagement
• Concentricity held within 0.03mm

Stage 5: Temperature-Controlled Assembly

• Clean-room assembly conditions for bearing installation
• Precision seal installation with measured lubrication
• Selective fitting and induction heating of roller body for bearing installation
• Rotational torque verification

Stage 6: Comprehensive Performance Testing

• Rotation torque test verifying smooth rotation within specified range
• Pressure leak test verifying seal system integrity
• 100% dimensional inspection of all critical installation and interface dimensions
• Visual inspection for surface defects

Stage 7: Surface Protection and Packaging

• Shot-peening for stress relief
• High-bond, corrosion-resistant primer and paint application
• Export-standard packaging with corrosion protection (VCI)
• Labeling with part number and model compatibility

4.3 Non-Destructive Testing (NDT)

Critical components undergo rigorous NDT procedures:

• Magnetic Particle Inspection: Detects surface and near-surface discontinuities in ferromagnetic materials
• Ultrasonic Testing: Verifies internal soundness and absence of subsurface defects

5. Functional Engineering: The Critical Role of Track Bottom Rollers

5.1 Primary Functions

The track bottom roller assembly (also known as track support roller) performs several essential functions within the Doosan DX55/DX60 undercarriage system :

1. Primary Load-Bearing: Supports the total weight of the excavator, distributing immense static and dynamic loads from the mainframe through the track chain to the ground . For the Doosan DX55/DX60, this means reliably supporting machines in the 5-7 ton operating weight class .
2. Track Chain Guidance: Constrains the vertical movement of the track chain, ensuring stable, low-friction travel along the track rail . The precision-machined flanges engage with the track links to maintain proper alignment and prevent derailment during turning operations .
3. Shock and Vibration Damping: Absorbs and mitigates impact loads from uneven terrain, protecting the integrity of the entire undercarriage and upper structure . This is particularly important for mini excavators that frequently operate in confined urban spaces with variable ground conditions .
4. Friction Reduction: By providing a rotating interface between the stationary track frame and the moving track chain, the roller minimizes sliding friction, reducing power consumption and heat generation.

5.2 Performance Characteristics

5.3 Critical Design Factors

When evaluating track rollers for mini excavator applications, three primary factors determine quality and longevity :

6. CQCTRACK: Professional Manufacturer Based in Quanzhou, China

6.1 Corporate Profile and Industry Position

CQCTRACK (HELI MACHINERY MANUFACTURING CO., LTD.) represents a mature, technically capable, and stable manufacturing source for critical undercarriage components . Founded in the late 1990s, the company has grown in parallel with China’s construction machinery boom, evolving from a specialized parts workshop into one of the top three undercarriage component manufacturers in the Quanzhou region .

Key Corporate Facts:

6.2 Strategic Location: Quanzhou Industrial Hub

Quanzhou, located in Fujian Province, is a key regional hub in China for the manufacturing of construction machinery and metal components . This strategic location provides CQCTRACK with:

• Access to a mature supply chain of raw materials and specialized components
• Proximity to major ports (Xiamen, Quanzhou) facilitating efficient global logistics
• Concentration of technical expertise in metallurgy and mechanical manufacturing
• Established infrastructure for heavy industrial production

6.3 Manufacturing Capabilities

CQCTRACK’s vertically integrated manufacturing facility encompasses:

6.4 Product Portfolio

Beyond track rollers for Doosan excavators, CQCTRACK manufactures a comprehensive range of undercarriage wear parts :

• Track Rollers: Bottom rollers and carrier rollers (top rollers) for various excavator classes
• Track Idlers: Front idler assemblies with precision guidance surfaces
• Track Sprockets: Drive wheels in segment or solid designs
• Track Chains: Links, bushings, and pins with induction-hardened surfaces
• Track Shoes: Single, double, and triple-grouser designs for various ground conditions

6.5 Brand Promise: CQCTRACK

The CQCTRACK brand symbolizes dedication to the Crawler, Quality, and Commitment that form the foundation of every machine . It represents a product line built for resilience, engineered to endure the most abrasive and high-impact environments in construction and infrastructure projects .

7. Supply Chain and Sourcing Advantages

7.1 Direct Manufacturer Benefits

As a vertically integrated professional manufacturer of tracked chassis parts and direct factory source, CQCTRACK offers distinct advantages to global procurement professionals :

7.2 Cross-Reference Verification Protocol

To ensure accurate part selection for the Doosan 200104-00017A track roller, the following verification process is recommended:

7.3 Logistics and Packaging

CQCTRACK ensures reliable global delivery through professional logistics management :

7.4 Warranty and After-Sales Support

7.5 Customization Services

For volume orders and strategic partnerships, CQCTRACK offers :

• Private Labeling: Custom packaging and component marking (minimum order quantity: 200 pieces)
• Custom Packaging: Tailored packaging solutions (minimum order quantity: 200 pieces)
• Graphic Customization: Custom component identification (minimum order quantity: 200 pieces)
• Bundled Supply: Complete undercarriage kits including rollers, idlers, sprockets, and track chains
• OEM/ODM Partnerships: Long-term supply agreements for equipment manufacturers

8. Installation and Maintenance Guidelines

8.1 Installation Precautions

For optimal performance and service life of the Doosan 200104-00017A track roller assembly, the following installation guidelines should be observed :

1. Matched Sets: Always install in matched sets per side to ensure even load distribution and track alignment .
2. Surface Cleaning: Thoroughly clean the track link mounting pins and bosses before installation to prevent contamination.
3. Proper Tooling: Use appropriate tools to press the roller onto the pin; avoid hammering directly on the seal or bearing area to prevent damage .
4. Bolt Torque: Follow Doosan DX55/DX60 service manual specifications for mounting bolt torque.
5. Thread Preparation: Apply medium-strength thread locker to prevent loosening under vibration.
6. Track Tension: Verify proper track tension after installation to prevent premature roller wear.
7. Break-in Period: Monitor for unusual heat or noise during initial operation.

8.2 Preventive Maintenance Schedule

9. Conclusion

The Doosan Excavator 200104-00017A DX55 DX60 Track Bottom Roller / Support Roller Assembly manufactured by CQCTRACK (HELI MACHINERY MANUFACTURING CO., LTD.) in Quanzhou, China, represents the ideal combination of precision engineering, quality materials, and value-driven manufacturing for compact excavator applications .

Engineered specifically for the Doosan DX55 and DX60 mini excavators, this track roller assembly delivers the reliability and performance that equipment owners demand for urban construction, landscaping, and municipal projects. The use of premium 50MnB alloy steel with induction-hardened surfaces (HRC 52-58) ensures exceptional wear resistance, while the advanced multi-stage seal system with floating ring seals provides maintenance-free operation in demanding environments .

Manufactured to OEM quality standards and certified under CQC (China Quality Certification) with ISO 9001:2015 compliance, this track roller assembly offers a cost-effective alternative to genuine Doosan parts without compromising on fitment, durability, or operational characteristics . The precision engineering ensures optimal load distribution, smooth operation, and extended service life in the most challenging environments.

As a professional manufacturer of tracked chassis parts with over 20 years of experience, CQCTRACK maintains complete vertical integration from raw material sourcing through forging, heat treatment, machining, assembly, and quality inspection . Based in the industrial hub of Quanzhou, Fujian Province, the company serves the global aftermarket as a trusted source for heavy-duty crawler excavator undercarriage components .

For detailed technical drawings, pricing information, or to discuss your specific undercarriage requirements, contact the CQCTRACK international sales and engineering team .

Technical Data Summary Table