Product Overview — Part 56B-50-12315
The 56B-50-12315 is a precision-manufactured Cab Mounts component. The 56B-50-12315 is an OEM-specification cab mount for Komatsu D-series track-type tractors (bulldozers). Bulldozer cab mounts operate in a particularly demanding environment — continuous track vibration, grading shock loads, and the high static weight of reinforced ROPS cab structures require robust rubber-to-metal bonded assemblies. The rubber compound used in part 56B-50-12315 is formulated for fatigue life under the multi-million-cycle loading that occurs during a typical dozer service interval. The bonding system is tested to withstand sustained shear loads equivalent to full cab overhang conditions on steep slopes. Companion Komatsu dozer cab mount 195-54-78410 covers the larger D65 and D85 series. For D51, D61 series, part 56B-50-12315 is the primary specification. Cross-reference against BOMAG heavy compactor cab mounts available on request — mixed fleet operators sometimes find common specifications between Komatsu dozer and BOMAG large compactor cab mounts.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 56B-50-12315 | OEM Specification |
| Hardness | 45–70 Shore A (application specific) | ISO 48-4 / ASTM D2240 |
| Tensile Strength | ≥ 16 MPa | ISO 37 / ASTM D412 |
| Elongation at Break | ≥ 300% | ISO 37 / ASTM D412 |
| Compression Set | ≤ 25% (22h/70°C) | ISO 815-1 / ASTM D395 |
| Temperature Range | −40°C to +90°C | Operational limits |
| Ozone Resistance | No cracking 168h | ISO 1431-1 |
| Fire Safety | EN 45545-2 HL2/HL3 available | EN 45545-2:2013 |
| Fatigue Life | > 1,000,000 cycles | Dynamic fatigue protocol |
Applications
Komatsu D51 D61 bulldozer cab mounts; Komatsu D41 D61PX grader-dozer cab; track-type tractor operator cab isolation.
Our technical team can assess suitability for other equipment types. Contact us with the make, model, and serial number for a precise cross-reference confirmation.
Material & Quality Standards
- Base Polymer: Natural Rubber (NR) or NR/SBR blend — excellent resilience and fatigue resistance
- Reinforcing Fillers: High-structure carbon black for controlled stiffness and wear resistance
- Protection Additives: Anti-ozonant wax and chemical antioxidant for extended outdoor service life
- Bonding System: Chemically bonded rubber-to-metal interface exceeding bulk rubber strength
- EN 45545-2 Option: Halogen-free flame retardant meeting smoke toxicity requirements (on request)
Every batch produced under ISO 9001:2015 QMS with full material traceability. Certificate of Conformance and material test reports available upon request.
Installation Guidelines
- Inspect on arrival: Verify part number 56B-50-12315. Check for transit damage — reject any non-conforming component.
- Clean mating surfaces: Remove all rust, old rubber fragments, grease, and paint before installation.
- Align correctly: Follow assembly drawing orientation. Incorrect orientation may cause premature failure.
- Torque fasteners: Use calibrated torque wrench and cross-pattern tightening sequence per OEM specification.
- Post-install check: Inspect for correct seating. Run equipment at low speed to verify no abnormal noise or vibration.