Product Overview

The Komatsu 20Y-30-00660 is a genuine OEM track recoil cushion assembly (also known as a track tensioner spring assembly or idler cushion assembly) designed specifically for Komatsu PC200-8 series hydraulic excavators. As a critical component of the undercarriage system, this cushion assembly works in conjunction with the front idler to maintain proper track chain tension, absorb impact forces from uneven terrain and obstacles, and protect the entire undercarriage from premature wear and damage .

Compatible Equipment Models

• Komatsu PC200-8 excavator
• Komatsu PC200LC-8 excavator
• Komatsu PC200-8M0 excavator
• Komatsu PC210-8 excavator
• Komatsu PC210LC-8 excavator
• Komatsu PC220-8 excavator
• Komatsu PC220LC-8 excavator
• Komatsu PC240LC-8 excavator

Key Specifications

• Part Number: 20Y-30-00660 (also referenced as 20Y3000660)
• Type: Hydraulic-assisted spring-loaded track recoil cushion assembly
• Weight: Approximately 45-50 kg (99-110 lbs)
• Quantity per machine: 2 units (one per track frame)
• Spring Free Length: 503 mm for standard PC200-8 models; 561 mm for PC200LC-8 and PC220-8 models
• Load at Installed Length: Approximately 109.3 kN (11,150 kg) for PC200-8
• Color: Black painted steel finish
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours for genuine Komatsu parts

Material & Manufacturing Process

The Komatsu 20Y-30-00660 cushion assembly is manufactured using premium materials and advanced production techniques to ensure exceptional durability and long service life:

• Recoil Spring: Forged from high-strength chromium-molybdenum alloy spring steel. The spring undergoes shot peening treatment to improve fatigue resistance and prevent cracking under repeated compression and extension cycles.
• Hydraulic Cylinder & Piston: Made from high-tensile alloy steel with precision honing for smooth operation and excellent wear resistance. The cylinder walls are hardened to prevent scoring and ensure long-term sealing performance.
• Sealing System: Features high-performance polyurethane U-packings and dust seals to prevent hydraulic fluid leakage and block the ingress of dirt, sand, water, and other contaminants .
• Mounting Brackets: Fabricated from heavy-duty steel plate with reinforced welds to withstand the extreme loads and shocks encountered in construction applications.
• Hydraulic Fluid: Filled with Komatsu genuine hydraulic oil specifically formulated for shock absorption applications.

Performance Features & Advantages

1. Superior Impact Absorption

The combination of a heavy-duty coil spring and hydraulic damping system effectively absorbs the impact forces generated when the track encounters rocks, curbs, and other obstacles. This prevents damage to the track frame, idler, track links, and other undercarriage components .

2. Automatic Track Tensioning

The hydraulic-assisted design automatically maintains proper track tension under all operating conditions, eliminating the need for frequent manual adjustments. Proper track tension reduces wear on track components, improves fuel efficiency, and prevents track derailment.

3. Exceptional Durability

All components are engineered to withstand the extreme loads and harsh operating conditions encountered in construction, mining, and demolition applications. The recoil spring is designed to maintain its elasticity and load-bearing capacity for over 5000 operating hours under normal conditions.

4. Advanced Sealing Technology

The multi-stage sealing system ensures long-term hydraulic fluid retention and prevents contamination of internal components. This extends the service life of the cushion assembly and reduces maintenance requirements.

5. Perfect OEM Fit

Manufactured to Komatsu's exact specifications, the 20Y-30-00660 cushion assembly provides a direct replacement for the original part, ensuring hassle-free installation and compatibility with all other undercarriage components .

6. Enhanced Machine Stability

By maintaining proper track tension and absorbing vibrations, this cushion assembly improves overall machine stability during operation, especially when turning or working on uneven terrain.

Applications

The Komatsu 20Y-30-00660 cushion assembly is essential for all types of excavator operations, including:

• General construction and building sites
• Road construction and maintenance
• Landscaping and site preparation
• Mining and quarry operations
• Demolition and debris removal
• Forestry and land clearing
• Urban infrastructure development

Maintenance Tips

• Regular Inspection: Inspect the cushion assembly every 250 operating hours for signs of oil leakage, spring damage, or excessive corrosion.
• Track Tension Check: Periodically check and adjust track tension according to Komatsu's recommended specifications to prevent excessive stress on the cushion assembly.
• Cleaning: Keep the cushion assembly and surrounding undercarriage components clean from dirt, mud, and debris to prevent abrasive wear and corrosion.
• Replacement Criteria: Replace the cushion assembly if there is significant oil leakage, spring damage, or loss of damping performance. A worn cushion assembly can cause accelerated wear on other undercarriage components.
• Complete Replacement: When replacing cushion assemblies, it is recommended to replace both units simultaneously to ensure even load distribution and consistent performance.
• Genuine Parts: Always use genuine Komatsu cushion assemblies to ensure optimal performance, durability, and compatibility with your machine.

Conclusion

The Komatsu 20Y-30-00660 cushion assembly is a high-quality, reliable undercarriage component that delivers exceptional performance and durability in demanding working environments. By effectively absorbing impacts and maintaining proper track tension, this cushion assembly 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.