Product Overview — Part 20891878
The 20891878 is a precision-manufactured Vibration Dampers component. Part 20891878 is a rubber isolation element providing multi-directional vibration attenuation for heavy construction equipment. Designed for applications where both vertical (axial) and horizontal (radial) vibration components must be controlled, this element uses a geometry that provides different stiffness values in the two main loading directions. The rubber compound uses EPDM or NR/SBR blend depending on operating temperature requirements, offering reliable performance from -35°C to +90°C. Anti-ozonant and UV stabilizer additives protect the rubber from environmental degradation in outdoor construction site conditions. Our vibration damper catalog includes BOMAG-specific variants for BW series compactors. For BOMAG applications, see parts 3128047510 and 3115 1926 02.
Technical Specifications
| Property | Value | Standard |
|---|---|---|
| Part Number | 20891878 | 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
Multi-axis vibration isolation for heavy equipment; rubber isolation pads for compaction machinery; cab and engine mount 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 20891878. 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.