20Y-54-51191 Komatsu Radiator Mount Cushion — PC200 & PC220 Cooling System Isolation
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu PC200-8 • In Stock
Product Overview
The 20Y-54-51191 is a specialized rubber mount cushion that isolates the radiator and cooling system assembly from the revolving frame on Komatsu PC200 to PC240 excavators. Radiators are vulnerable to vibration-induced fatigue — the brazed aluminum or copper-brass core tubes and header joints can develop micro-cracks when subjected to continuous high-frequency vibration, leading to coolant leaks and eventual catastrophic overheating.
By decoupling the radiator from the frame-mounted vibration sources (engine and hydraulic system), the 20Y-54-51191 extends radiator service life by 30-50% compared to machines running on worn or missing radiator mounts. Given that a replacement radiator for a PC200-class excavator costs 5-10x more than a set of radiator mount cushions, maintaining these mounts is an exceptionally cost-effective reliability measure.
The 20Y-54-51191 uses a softer compound than engine mounts to provide maximum vibration isolation for the lightweight but fragile radiator assembly. It also provides thermal isolation, reducing heat transfer from the engine compartment frame to the radiator mounting points.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 20Y-54-51191 |
| OEM Brand | Komatsu |
| Type | Radiator Mount Cushion / Cooling System Anti-Vibration Mount |
| Compatible Equipment | Komatsu PC200-8, PC200LC-8, PC210-10, PC220-8, PC240-10 |
| Cross-Reference | — |
| Material | Natural Rubber (NR) Compound |
| Hardness | 40 ± 5 Shore A (ISO 48-4) |
| Tensile Strength | ≥ 12 MPa (ISO 37) |
| Elongation at Break | ≥ 350% |
| Temperature Range | −40°C to +90°C |
| Compression Set | ≤ 25% (ISO 815-1) |
| Quality | ISO 9001:2015 Certified |
| Availability | In Stock — Ships Worldwide |
Compatible Komatsu Equipment
- Komatsu PC200-8, PC200LC-8 — 20-tonne excavator radiator mount
- Komatsu PC210-10 — 21-tonne Tier 4 Final excavator
- Komatsu PC220-8 — 22-tonne production excavator
- Komatsu PC240-10 — 24-tonne excavator
Always verify your machine model and serial number before ordering. Contact us for free cross-reference verification.
Key Features & Benefits
OEM-Equivalent Quality
Manufactured to Komatsu's original engineering specifications with ±0.5 mm dimensional tolerance. Direct bolt-on replacement with no modifications required. Metal components zinc-plated for corrosion resistance.
Extreme Temperature Range
Operational from −40°C to +90°C, covering Arctic mining to tropical construction sites. IPPD/TMQ antioxidant system prevents thermal degradation. Anti-ozonant wax migration protects surface integrity.
Extended Service Life
Engineered for 8,000 to 15,000 operating hours under standard duty cycles. HAF carbon black reinforcement provides exceptional fatigue crack resistance through millions of load cycles.
Global Express Shipping
In stock and ships worldwide in 3–5 business days via DHL, FedEx, or UPS. Full commercial documentation included for seamless customs clearance in all major markets.
Performance Specifications
| Property | Specification | Test Method |
|---|---|---|
| Hardness | 40 ± 5 Shore A | ISO 48-4 |
| Tensile Strength | ≥ 12 MPa | ISO 37 |
| Elongation at Break | ≥ 350% | ISO 37 |
| Compression Set (24h @ 70°C) | ≤ 25% | ISO 815-1 |
| Tear Strength | ≥ 25 kN/m | ISO 34-1 |
| Accelerated Aging (72h @ 100°C) | Hardness change ≤ 8 IRHD | ISO 188 |
| Ozone Resistance (200 pphm, 48h) | No cracks at 20% strain | ISO 1431-1 |
| Operating Temperature | −40°C to +90°C | Continuous |
Maintenance & Expected Lifespan
Under standard operating conditions, the 20Y-54-51191 has an expected service life of 8,000 to 15,000 operating hours. In severe duty applications (24/7 mining, extreme temperatures, high dust), service life may be reduced. Inspect at every major service interval (2,000 hours) for surface cracking, compression set, oil contamination, and mounting hardware integrity.
Replacement criteria: Replace when surface cracks exceed 2 mm depth, compression set exceeds 30%, rubber shows oil swelling, or the operator reports increased vibration. Always replace all mounts simultaneously for optimal isolation performance.
