421-54-11781 Komatsu Engine Mount — WA470 & WA500 Large Wheel Loader
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu WA470-6 • In Stock
Product Overview
The 421-54-11781 is a heavy-duty rubber engine mount for Komatsu WA470 and WA500 large wheel loaders. These are production-class machines deployed in mining, quarrying, and heavy aggregate operations where they load haul trucks, feed crushers, and manage stockpiles at rates exceeding 400-600 tonnes per hour.
The WA470/WA500 platform uses SAA6D125E/SAA6D140E engines producing 270-370 HP, generating substantially more vibration energy than the mid-size WA380. The 421-54-11781 mount has correspondingly higher load capacity and stiffer compound tuning to manage these forces while maintaining acceptable cab vibration levels for operators working 10-12 hour shifts.
In mining applications, WA470/WA500 loaders operate alongside haul trucks in a continuous loading cycle. Unplanned downtime due to failed engine mounts can disrupt the entire haulage circuit. We stock the 421-54-11781 for immediate worldwide shipment to minimize downtime risk.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 421-54-11781 |
| OEM Brand | Komatsu |
| Type | Rubber Engine Mount / Anti-Vibration Mount |
| Compatible Equipment | Komatsu WA470-6, WA470-7, WA470-8, WA500-6, WA500-7, WA500-8 |
| Cross-Reference | — |
| Material | Natural Rubber (NR) Compound |
| Hardness | 60 ± 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 WA470-6, WA470-7, WA470-8 — 30-tonne class large wheel loader
- Komatsu WA500-6, WA500-7, WA500-8 — 36-tonne class production loader
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 4,000 to 8,000 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 | 60 ± 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 421-54-11781 has an expected service life of 4,000 to 8,000 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.
