Product Overview — Part 20891908
The 20891908 is a precision-manufactured Cab Mounts component. The 20891908 cab mount is engineered for heavy construction equipment applications requiring robust operator cab isolation from tri-axial vibration. This component handles simultaneous vertical, lateral, and fore-aft loading while maintaining controlled stiffness to prevent cab resonance. Manufactured with a natural rubber compound providing 55-65 Shore A hardness, part 20891908 is designed for equipment categories where cab loads can reach several hundred kilograms static weight with dynamic amplification factors of 2.5x or higher during operation on uneven terrain. For BOMAG-specific cab mounting requirements, refer to our complete BOMAG cab mount series including the 3128 0458 series which covers 15, 18, and 24 Shore A hardness variants for BW series compactors.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 20891908 | 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
Heavy construction equipment cab mounts; vibratory compactor operator cab isolation; multi-axis vibration systems.
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 20891908. 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.