Product Overview — Part 211-4987
The 211-4987 is a precision-manufactured Engine Cushion / Rubber Mount component for demanding industrial and heavy equipment applications. Engine mount for Caterpillar 320, 325 and 330 series excavators. OEM cross-reference 211-4987. Rubber-bonded-to-steel with anti-ozone protection system.
The CAT 320/330 platform accounts for a large portion of excavator operating hours in North American construction. Part 211-4987 is engineered to the dimensional and stiffness specifications used by Caterpillar, enabling seamless installation into any 320D or 330D machine. The compound uses ozone-resistant additives proven in high-UV-exposure environments common in US, Canadian, and Australian jobsites.
Browse related products: 227-0172, 358-0286, 1524771, 6129902 for complete engine cushion system maintenance solutions.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 211-4987 | 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
Caterpillar 320B, 320C, 320D, 321B; 325B, 325C, 325D; 330B, 330C, 330D series crawler 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 211-4987. 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.