22U-54-25441 Komatsu Engine Mount — PC78US & PC88MR Compact Excavator
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu PC78US-8 • In Stock
Product Overview
The 22U-54-25441 is a rubber engine mount designed for Komatsu's compact and midi excavator class — the PC78US and PC88MR platforms in the 7-9 tonne operating weight range. These tight-radius and zero-tail-swing machines are designed for confined urban jobsites where they operate in close proximity to occupied buildings, utilities, and pedestrian areas.
In urban applications, vibration and noise control are critical for regulatory compliance and community relations. The 22U-54-25441 mount provides effective engine isolation that reduces both structure-borne vibration and airborne noise emissions. Many municipal and commercial contracts specify maximum vibration and noise limits for equipment operating near sensitive receptors — properly maintained engine mounts help machines meet these requirements.
The compact excavator market is the fastest-growing segment in construction equipment, with PC78US and PC88MR units commonly used for landscaping, utility installation, basement excavation, and indoor demolition. We stock the 22U-54-25441 for immediate worldwide shipment.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 22U-54-25441 |
| OEM Brand | Komatsu |
| Type | Rubber Engine Mount / Anti-Vibration Mount |
| Compatible Equipment | Komatsu PC78US-8, PC78US-10, PC88MR-8, PC88MR-10 |
| Cross-Reference | — |
| Material | Natural Rubber (NR) Compound |
| Hardness | 50 ± 5 Shore A (ISO 48-4) |
| Tensile Strength | ≥ 12 MPa (ISO 37) |
| Elongation at Break | ≥ 350% |
| Temperature Range | −40°C to +90°C |
| Compression Set | ≤ 25% (ISO 815-1) |
| Quality | ISO 9001:2015 Certified |
| Availability | In Stock — Ships Worldwide |
Compatible Komatsu Equipment
- Komatsu PC78US-8, PC78US-10 — 7.8-tonne compact excavator — zero tail swing
- Komatsu PC88MR-8, PC88MR-10 — 8.8-tonne midi excavator — tight-radius design
Always verify your machine model and serial number before ordering. Contact us for free cross-reference verification.
Key Features & Benefits
OEM-Equivalent Quality
Manufactured to Komatsu's original engineering specifications with ±0.5 mm dimensional tolerance. Direct bolt-on replacement with no modifications required. Metal components zinc-plated for corrosion resistance.
Extreme Temperature Range
Operational from −40°C to +90°C, covering Arctic mining to tropical construction sites. IPPD/TMQ antioxidant system prevents thermal degradation. Anti-ozonant wax migration protects surface integrity.
Extended Service Life
Engineered for 5,000 to 10,000 operating hours under standard duty cycles. HAF carbon black reinforcement provides exceptional fatigue crack resistance through millions of load cycles.
Global Express Shipping
In stock and ships worldwide in 3–5 business days via DHL, FedEx, or UPS. Full commercial documentation included for seamless customs clearance in all major markets.
Performance Specifications
| Property | Specification | Test Method |
|---|---|---|
| Hardness | 50 ± 5 Shore A | ISO 48-4 |
| Tensile Strength | ≥ 12 MPa | ISO 37 |
| Elongation at Break | ≥ 350% | ISO 37 |
| Compression Set (24h @ 70°C) | ≤ 25% | ISO 815-1 |
| Tear Strength | ≥ 25 kN/m | ISO 34-1 |
| Accelerated Aging (72h @ 100°C) | Hardness change ≤ 8 IRHD | ISO 188 |
| Ozone Resistance (200 pphm, 48h) | No cracks at 20% strain | ISO 1431-1 |
| Operating Temperature | −40°C to +90°C | Continuous |
Maintenance & Expected Lifespan
Under standard operating conditions, the 22U-54-25441 has an expected service life of 5,000 to 10,000 operating hours. In severe duty applications (24/7 mining, extreme temperatures, high dust), service life may be reduced. Inspect at every major service interval (2,000 hours) for surface cracking, compression set, oil contamination, and mounting hardware integrity.
Replacement criteria: Replace when surface cracks exceed 2 mm depth, compression set exceeds 30%, rubber shows oil swelling, or the operator reports increased vibration. Always replace all mounts simultaneously for optimal isolation performance.
