Product Overview

The Komatsu 20Y-30-28281 is a genuine OEM bottom track roller (also known as a lower roller or support roller) designed specifically for Komatsu PC200-8 series hydraulic excavators. As a critical component of the undercarriage system, this track roller supports the entire weight of the excavator while guiding the track chain and ensuring smooth movement across various terrains .

Compatible Equipment Models

• Komatsu PC200-8 excavator
• Komatsu PC200LC-8 excavator
• Komatsu PC210-8 excavator
• Komatsu PC220-8 excavator
• Komatsu PC240 excavator

Key Specifications

• Part Number: 20Y-30-28281 (also referenced as 20Y3028281)
• Type: Double flange bottom track roller
• Weight: Approximately 33-34 kg
• Quantity per machine: 7 rollers per side (14 total) for PC200-8; 9 rollers per side (18 total) for PC200LC-8
• Color: Black (standard OEM finish)
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours for genuine Komatsu parts

Material & Manufacturing Process

The Komatsu 20Y-30-28281 track roller is manufactured using premium materials and advanced heat treatment processes to ensure exceptional durability and performance:

• Roller Body: Forged from high-quality 40Mn2 alloy steel, which provides excellent hardenability and impact resistance. The body undergoes tempering followed by medium-frequency induction surface hardening, resulting in a surface hardness of HRC 52-58 with a hardening depth of 5-10mm .
• Shaft: Made from 45# or 50Mn steel, heat-treated to achieve a surface hardness of HRC 52-60 with a hardening depth of 3-6mm. The shaft surface is precision-polished to minimize friction and wear on internal components .
• Floating Seal: Constructed from chromium-aluminum alloy with a hardness of HRC 65-72 and a working surface roughness of 0.1-0.2μm, 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. Exceptional Load-Bearing Capacity

Engineered to support the full operating weight of Komatsu PC200-8 series excavators (19,400–21,460 kg) while withstanding the dynamic shock loads encountered during excavation, lifting, and travel operations .

2. Superior 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 .

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 double-flange design provides maximum track guidance, preventing lateral slippage and derailment. This ensures stable machine operation, especially during turning maneuvers and on uneven terrain .

5. Reduced Friction & Heat Generation

Highly polished shafts and precision-machined internal components minimize friction, reducing heat buildup and energy consumption. Reservoir cavities within the roller shell and shaft ensure continuous lubrication of all moving parts .

6. Perfect OEM Fit

Manufactured to Komatsu's exact specifications, the 20Y-30-28281 track roller provides a direct replacement for the original part, ensuring hassle-free installation and compatibility with all other undercarriage components .

Applications

The Komatsu 20Y-30-28281 track 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

Maintenance Tips

• Regularly inspect track rollers for signs of wear, damage, or oil leakage
• Maintain proper track tension to reduce excessive stress on rollers
• Clean undercarriage components after working in muddy or sandy conditions
• Replace all track rollers simultaneously to ensure even wear and optimal performance
• Use only genuine Komatsu lubricants and replacement parts for best results

Conclusion

The Komatsu 20Y-30-28281 track roller is a high-quality, reliable undercarriage component that delivers exceptional performance and durability in demanding working environments. By choosing genuine Komatsu OEM parts, you ensure that your PC200-8 excavator operates at peak efficiency with minimal downtime and maximum productivity.