Product Overview

Komatsu PC200-8 Cushion Assemblies are critical vibration and shock absorption components designed specifically for Komatsu PC200-8 series hydraulic excavators. These assemblies play a vital role in isolating vibrations generated by the engine, hydraulic system, and ground impacts, protecting both the machine's structural integrity and the operator's comfort. There are three primary types of cushion assemblies used in the PC200-8: engine mount cushions, cab mount cushions, and idler cushion assemblies .

Compatible Equipment Models

• Komatsu PC200-8 excavator
• Komatsu PC200LC-8 excavator
• Komatsu PC210-8 excavator
• Komatsu PC220-8 excavator
• Komatsu PC240-8 excavator
• Komatsu PC270-8 excavator

Key Specifications

1. Engine Mount Cushion

• Primary Part Numbers: 20Y-01-12210 (Front), 20Y-01-12222 (Rear)
• Type: Rubber-metal bonded vibration isolator
• Weight: Approximately 2.5-3.5 kg per unit
• Quantity per machine: 4 units (2 front, 2 rear)
• Color: Black rubber with silver steel inserts
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours for genuine Komatsu parts

2. Cab Mount Cushion

• Primary Part Numbers: 20Y-53-13113, 20Y-53-13121
• Type: Hydraulic-filled rubber mount
• Weight: Approximately 8-10 kg per unit
• Quantity per machine: 4 units (one at each corner of the cab)
• Color: Black rubber with black steel housing
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours

3. Idler Cushion Assembly

• Primary Part Number: 20Y-54-75110
• Type: Spring-loaded hydraulic buffer
• Load at installed length: 109.3 kN (11,150 kg) for PC200-8
• Free length of spring: 503 mm for PC200-8
• Weight: Approximately 45-50 kg per unit
• Quantity per machine: 2 units (one per track frame)
• Color: Black painted steel
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours

Material & Manufacturing Process

Engine & Cab Mount Cushions

• Rubber Body: Manufactured from high-resilience, oil-resistant vulcanized natural rubber compound with excellent damping properties. The rubber is formulated to withstand extreme temperatures ranging from -40°C to +120°C .
• Steel Inserts: Precision-machined from high-quality carbon steel with zinc plating for corrosion resistance. The steel inserts are chemically treated to ensure a permanent bond with the rubber .
• Bonding Process: Uses advanced heat and pressure vulcanization technology to create a seamless, high-strength bond between the rubber and steel components, preventing separation under heavy loads .

Idler Cushion Assembly

• Cylinder & Piston: Made from high-tensile alloy steel with precision honing for smooth operation and excellent wear resistance .
• Coil Spring: Forged from high-strength spring steel with shot peening treatment to improve fatigue resistance and extend service life .
• Seals: Features high-performance polyurethane U-packings and dust seals to prevent hydraulic fluid leakage and block contaminants .
• Hydraulic Fluid: Filled with Komatsu genuine hydraulic oil specifically formulated for shock absorption applications .

Performance Features & Advantages

1. Superior Vibration Isolation

• Engine and cab mount cushions provide excellent vibration damping efficiency (up to 75%), reducing structural fatigue and extending the service life of sensitive components such as electrical systems, hydraulic valves, and instrumentation .
• The idler cushion assembly absorbs the impact forces generated when the track encounters obstacles, preventing damage to the undercarriage frame and track components .

2. Enhanced Operator Comfort

• Cab mount cushions significantly reduce cab vibration and noise levels, minimizing operator fatigue during long working hours and improving overall productivity .
• The hydraulic-filled design of cab mounts provides superior damping characteristics compared to conventional rubber mounts, especially at low frequencies .

3. Exceptional Durability

• All cushion assemblies are engineered to withstand the extreme loads and harsh operating conditions encountered in construction, mining, and demolition applications .
• The rubber compounds used are resistant to oil, fuel, UV radiation, and ozone, preventing premature aging and cracking .
• The idler cushion spring is designed to maintain its elasticity and load-bearing capacity for over 5000 operating hours under normal conditions .

4. Perfect OEM Fit

• Manufactured to Komatsu's exact specifications, all cushion assemblies provide a direct replacement for the original parts, ensuring hassle-free installation and compatibility with all other machine components .
• Precise bolt hole alignment and mounting dimensions guarantee proper installation and optimal performance .

5. Comprehensive Protection

• The idler cushion assembly maintains proper track tension under all operating conditions, preventing track derailment and excessive wear on track links, rollers, and sprockets .
• Engine mounts isolate engine vibrations from the chassis, reducing noise transmission and preventing damage to surrounding components .

Applications

Komatsu PC200-8 cushion assemblies are 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 all cushion assemblies every 250 operating hours for signs of wear, cracking, deformation, or oil leakage .
• Torque Check: Periodically check and retighten mounting bolts to the manufacturer's recommended torque specifications to prevent loosening .
• Cleaning: Keep cushion surfaces clean from dirt, mud, and debris to prevent abrasive wear and corrosion .
• Replacement Criteria: Replace engine and cab mounts if the rubber shows signs of cracking, separation from the steel inserts, or excessive compression. Replace the idler cushion assembly if there is oil leakage, spring damage, or loss of damping performance .
• Complete Replacement: When replacing cushion assemblies, it is recommended to replace all units of the same type 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

Komatsu PC200-8 cushion assemblies are essential components that contribute significantly to the machine's performance, durability, and operator comfort. By effectively isolating vibrations and absorbing shocks, these assemblies protect both the excavator's structural integrity and the operator's well-being. Choosing genuine Komatsu OEM cushion assemblies ensures that your PC200-8 excavator operates at peak efficiency with minimal downtime and maximum productivity in even the most demanding working environments.