Product Overview — Part 211-4987
The 211-4987 is a precision-manufactured Cab Mounts component. Part 211-4987 is an OEM-specification cab mount for Caterpillar excavator cab isolation. Designed for CAT 320, 323, 330, 336, and 340 series excavators, this mount provides the critical anti-vibration interface that protects operators from engine, swing, and attachment-induced vibration during excavation work. The rubber compound formulation is matched to CAT's original specification, providing equivalent hardness (Shore A), dynamic stiffness, and fatigue life to OEM parts. Our dimensional verification process checks all critical dimensions and mounting hole patterns against CAT engineering drawings. Part 211-4987 is supplied with the same bonded rubber-to-metal construction as the OEM component, ensuring the same installation torque values and assembly clearances. Certificates of conformance available upon request for US fleet maintenance programs.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 211-4987 | 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
CAT 320 323 330 336 340 excavator cab mounts; Caterpillar excavator operator cab isolation; CAT D-series dozer cab applications.
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 211-4987. 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.