Product Overview

The Komatsu 20Y-30-28510 is a genuine OEM carrier roller (also known as a top roller or upper roller) designed specifically for Komatsu PC200-8 series hydraulic excavators. As a critical component of the undercarriage system, this carrier roller supports the upper section of the track chain, preventing excessive sagging and ensuring smooth, efficient track movement across all types of terrain . It also helps maintain proper track alignment and reduces vibration during machine operation.

Compatible Equipment Models

• Komatsu PC200-8 excavator
• Komatsu PC200LC-8 excavator
• Komatsu PC200LC-8HD excavator
• Komatsu PC210-8 excavator
• Komatsu PC210LC-8 excavator
• Komatsu PC220-8 excavator
• Komatsu PC220LC-8 excavator
• Komatsu PC228US-8 excavator
• Komatsu PC240LC-8 excavator

Key Specifications

• Part Number: 20Y-30-28510 (also referenced as 20Y3028510)
• Type: Single flange carrier roller
• Weight: Approximately 14-16 kg (31-35 lbs)
• Quantity per machine: 2 rollers per side (4 total) for all PC200-8 series models
• Shaft Diameter: 40 mm
• Color: Black or yellow (standard OEM finishes)
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours for genuine Komatsu parts

Material & Manufacturing Process

The Komatsu 20Y-30-28510 carrier roller is manufactured using premium materials and advanced production techniques to ensure exceptional durability and long service life:

• Roller Body: Forged from high-quality 40Mn2 or 35MnB alloy steel, which provides an optimal balance of surface hardness and core ductility . The body undergoes normalization followed by medium-frequency induction surface hardening, resulting in a surface hardness of HRC 52-58 with a hardening depth of 5-10 mm .
• Shaft: Made from 45# or 50Mn steel, heat-treated to achieve a surface hardness of HRC 52-60 with a hardening depth of 3-6 mm. The shaft surface is precision-polished to minimize friction and wear on internal bearings .
• Bearings: Equipped with high-performance bi-metallic bushings that provide excellent load-bearing capacity and wear resistance .
• Floating Seal: Constructed from chromium-aluminum alloy with a hardness of HRC 65-72 and a working surface roughness of 0.1-0.2 μm, ensuring superior sealing performance .
• O-Ring: Manufactured from high-grade nitrile butadiene rubber (NBR), offering excellent oil resistance and high-temperature resistance .

Performance Features & Advantages

1. Superior Track Support

Engineered to support the weight of the upper track chain while maintaining proper tension, preventing excessive sagging that can lead to track derailment, increased wear, and reduced fuel efficiency .

2. Exceptional Wear Resistance

The deep induction hardening process creates a tough, wear-resistant outer layer while maintaining a ductile core that absorbs impacts. This design prevents premature wear, cracking, and deformation, even in abrasive working conditions such as sand, gravel, and rock .

3. Advanced Sealing System

The dual-seal design (floating seal + O-ring) effectively prevents lubricant leakage and blocks the ingress of dirt, sand, water, and other contaminants. This extends the service life of internal bearings and reduces maintenance requirements .

4. Optimized Track Alignment

The single-flange design provides precise track guidance, preventing lateral movement and ensuring smooth track operation. This reduces wear on track links, pins, and bushings, extending the overall service life of the undercarriage system .

5. Reduced Friction & Heat Generation

Highly polished shafts and precision-machined internal components minimize friction, reducing heat buildup and energy consumption. The internal reservoir design ensures continuous lubrication of all moving parts throughout the roller's service life .

6. Perfect OEM Fit

Manufactured to Komatsu's exact specifications, the 20Y-30-28510 carrier roller provides a direct replacement for the original part, ensuring hassle-free installation and compatibility with all other undercarriage components .

Applications

The Komatsu 20Y-30-28510 carrier roller is suitable for a wide range of construction and earthmoving applications, including:

• General construction sites
• Road building and maintenance
• Landscaping and site preparation
• Mining and quarry operations
• Demolition work
• Forestry applications
• Urban infrastructure development

Maintenance Tips

• Regular Inspection: Inspect carrier rollers every 250 operating hours for signs of wear, damage, or oil leakage .
• Rotation Check: Periodically check that all carrier rollers rotate freely without binding or excessive noise.
• Cleaning: Clean undercarriage components after working in muddy or sandy conditions to remove abrasive materials that can accelerate wear .
• Replacement Criteria: Replace carrier rollers if they show signs of excessive wear, cracking, deformation, or oil leakage. Worn carrier rollers can cause accelerated wear on other undercarriage components .
• Complete Replacement: When replacing carrier rollers, it is recommended to replace all four rollers simultaneously to ensure even wear and optimal performance .
• Genuine Parts: Always use genuine Komatsu carrier rollers to ensure optimal performance, durability, and compatibility with your machine.

Conclusion

The Komatsu 20Y-30-28510 carrier roller is a high-quality, reliable undercarriage component that delivers exceptional performance and durability in demanding working environments. By effectively supporting the track chain and maintaining proper alignment, this carrier roller helps extend the service life of your excavator's undercarriage system while ensuring smooth, efficient operation. Choosing genuine Komatsu OEM parts ensures that your PC200-8 excavator operates at peak efficiency with minimal downtime and maximum productivity.