20Y-54-11273 Komatsu Hydraulic Pump Mount — PC200 Series Pump Isolation
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu PC200-7 • In Stock
Product Overview
The 20Y-54-11273 is a rubber mount cushion that isolates the main hydraulic pump assembly from the engine/PTO interface on Komatsu PC200-series excavators. Hydraulic piston pumps generate high-frequency pressure pulsations at multiples of their piston count multiplied by shaft speed — creating vibration signatures distinct from engine firing pulses. The 20Y-54-11273 is tuned to attenuate these specific frequencies.
Without proper pump mount isolation, hydraulic pressure pulsations transmit as noise and vibration through the pump mounting bracket into the engine block and from there into the revolving frame. This "hydraulic whine" is one of the most common operator complaints on excavators with worn pump mounts. The 20Y-54-11273 restores factory-quiet operation by breaking the metal-to-metal vibration transmission path between the pump housing and the engine.
The 20Y-54-11273 works as part of a complete vibration isolation system alongside engine mounts like the 20Y-54-39520 and 17A-54-46120. For comprehensive vibration reduction during a major overhaul, we recommend replacing pump mounts and engine mounts simultaneously. Contact us for complete isolation kit pricing.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 20Y-54-11273 |
| OEM Brand | Komatsu |
| Type | Hydraulic Pump Mount / Anti-Vibration Cushion |
| Compatible Equipment | Komatsu PC200-7, PC200-8, PC200LC-8, PC210-8, PC220-8 |
| Cross-Reference | — |
| Material | Natural Rubber (NR) Compound |
| Hardness | 55 ± 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 PC200-7, PC200-8 — 20-tonne excavator hydraulic pump mount
- Komatsu PC200LC-8 — long-carriage 20-tonne variant
- Komatsu PC210-8, PC220-8 — 21-22 tonne class excavators
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 8,000 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 | 55 ± 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 20Y-54-11273 has an expected service life of 5,000 to 8,000 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.
