Product Overview — Part 8A31-54-1110
The 8A31-54-1110 is a precision-manufactured Cab Mounts component. The 8A31-54-1110 is an OEM-specification cab mount for Hitachi ZX series hydraulic excavators. This component provides the primary vibration isolation interface between the Hitachi excavator upper frame and the operator cab, protecting the operator from engine, swing, and attachment-induced vibration. Hitachi ZX series excavators are widely used on North American construction sites and civil engineering projects. Part 8A31-54-1110 is specified for ZX200, ZX210, ZX250, and ZX270 series models where cab mount replacement is part of scheduled maintenance programs. The rubber compound matches Hitachi's original specification for hardness, dynamic stiffness, and fatigue life. Our manufacturing process achieves consistent vulcanization results with full dimensional and hardness inspection before dispatch. Related Hitachi cab mounts 8A31-54-1130 (front) and 8A31-54-1140 (rear) complete the full Hitachi ZX cab mount set.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 8A31-54-1110 | 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
Hitachi ZX200, ZX210, ZX225, ZX250, ZX270 excavator cab mounts; Hitachi EX series hydraulic excavator 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 8A31-54-1110. 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.