Product Overview — Part 8A31-54-1110
The 8A31-54-1110 is a precision-manufactured Engine Cushion / Rubber Mount component for demanding industrial and heavy equipment applications. Premium Hitachi engine cushion mount for ZX400 to ZX850 high-capacity excavators. Superior compound and bonding quality for maximum service life.
Part 8A31-54-1110 is the premium engine cushion offered for Hitachi large excavator platforms used in mining and heavy civil construction across the United States, Canada, and Australia. The premium designation reflects the use of a high-specification natural rubber compound with enhanced heat ageing resistance (no cracking after 168h at 100°C per ISO 188), which extends service life in the high-temperature engine bays of large Hitachi machines operating in desert and tropical climates. All parts are supplied with an OEM-equivalent certificate of conformance.
Browse related products: 1524771, 6129902, 1487116, 450122 for complete engine cushion system maintenance solutions.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 8A31-54-1110 | OEM Specification |
| Hardness | 60 ± 5 Shore A | ISO 48-4 / ASTM D2240 |
| Tensile Strength | ≥ 18 MPa | ISO 37 / ASTM D412 |
| Elongation at Break | ≥ 350% | ISO 37 / ASTM D412 |
| Compression Set | ≤ 25% (22h/70°C) | ISO 815-1 / ASTM D395 |
| Temperature Range | −40°C to +100°C | Operational limits |
| Ozone Resistance | No cracking 168 h | ISO 1431-1 |
| Fire Safety | EN 45545-2 HL2/HL3 avail. | EN 45545-2:2013 |
| Fatigue Life | >1,500,000 cycles | Dynamic fatigue test |
| Bond Strength | ≥ Bulk rubber tear | ISO 813 |
Applications & Compatibility
Hitachi ZX400, ZX450, ZX470, ZX500, ZX670, ZX850 large crawler excavators; Hitachi EX1200 and EX2500 mining excavators.
Our engineering team can confirm compatibility for other equipment types not listed above. Contact us with the make, model, year, and serial number for precise cross-reference verification before ordering.
Material & Quality Standards
- Base Polymer: Natural Rubber (NR) or NR/SBR blend — outstanding resilience and low heat buildup
- Reinforcing Fillers: High-structure carbon black for controlled stiffness and abrasion resistance
- Protection Additives: Anti-ozonant wax and chemical antioxidant system for extended outdoor service life
- Bonding System: Chemically bonded rubber-to-metal interface with bond strength exceeding bulk rubber tear strength
- EN 45545-2 Option: Halogen-free flame retardant meeting smoke toxicity requirements for railway-grade applications
All production batches manufactured under ISO 9001:2015 QMS with full material traceability from raw compound to finished product. Certificates of conformance and material test reports supplied on request.
Installation & Maintenance
- Verify on arrival: Confirm part number 8A31-54-1110. Inspect for transit damage or surface defects — reject any non-conforming item.
- Prepare mating surfaces: Remove all rust, old rubber residue, grease, and loose paint. Flatness tolerance within 0.5 mm for proper seating.
- Correct orientation: Follow the assembly drawing or OEM workshop manual. Incorrect orientation causes premature failure and may void warranty.
- Torque fasteners: Use a calibrated torque wrench with a cross-pattern tightening sequence to the OEM-specified value.
- Post-installation check: Inspect for correct seating and gap clearance. Run equipment at idle to confirm absence of abnormal noise or vibration.
Recommended replacement interval: 3,000–5,000 operating hours or at first sign of cracking, permanent deformation exceeding 3 mm, or detachment of rubber from metal insert.