56B-50-12315 Komatsu Rubber Engine Mount — D375A Mining Dozer Platform
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu D375A-5 • In Stock
Product Overview
The 56B-50-12315 is a specialized rubber engine mount designed for the Komatsu D375A series, one of Komatsu's flagship super-large mining dozers in the 72-tonne operating weight class. This mount serves as a critical component in the engine-to-frame isolation system, managing the substantial vibration loads generated by the SAA6D170E engine — a turbocharged, aftercooled inline-6 diesel producing over 500 horsepower.
In the D375A application, the 56B-50-12315 works in conjunction with the 195-54-78412 cushion damper to provide comprehensive powertrain isolation. While the two parts may share similar raw materials and manufacturing processes, they serve different mounting positions and have distinct geometric profiles optimized for the specific load paths at each location. Mining maintenance managers should reference their Komatsu parts catalog to determine the complete set of engine mount components required for a full overhaul on their specific machine serial number.
The D375A operates predominantly in open-pit mining environments where continuous operation, extreme dust loading, and wide temperature swings are the norm. The 56B-50-12315 mount is formulated with enhanced chemical resistance to withstand the diesel fuel, hydraulic oil, and coolant vapors present in the engine compartment of a working mining dozer. Anti-ozonant additives protect against the elevated ozone levels found near electrical switch gear and welding operations common in mining workshops.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 56B-50-12315 |
| OEM Brand | Komatsu |
| Type | Rubber Engine Mount / Anti-Vibration Mount |
| Compatible Equipment | Komatsu D375A-5, D375A-6 |
| Cross-Reference | 195-54-78412 (companion cushion damper) |
| 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 D375A-5 — 72-tonne super-large mining dozer
- Komatsu D375A-6 — next-generation 72-tonne mining dozer with improved fuel efficiency
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 5,000 to 10,000 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 56B-50-12315 has an expected service life of 5,000 to 10,000 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.
