17A-54-46120 Komatsu Rubber Cushion Mount — PC200 & PC300 Excavator Series
OEM-Equivalent • ISO 9001:2015 Certified • Komatsu PC200-8 • In Stock
Product Overview
The 17A-54-46120 is a rubber cushion mount engineered for Komatsu PC-series hydraulic excavators in the 20 to 35-tonne class. This component provides critical vibration isolation between the powerplant assembly (engine and hydraulic pump group) and the excavator's revolving frame. In tracked hydraulic excavators, the engine operates at variable RPM under rapidly changing hydraulic loads — during digging, swinging, traveling, and boom lifting — generating complex multi-axis vibration patterns that differ significantly from the steady-state vibrations found in crawler dozers.
The 17A-54-46120 mount absorbs these irregular load pulses and prevents them from propagating into the upperstructure, protecting sensitive hydraulic valves, electronic controllers, the operator cab mounting system, and structural welds on the revolving frame from fatigue damage. The part number appears in Komatsu's official parts catalog under the engine mounting group for PC200 through PC350 series machines, making it one of the most widely applicable engine mount components in the Komatsu excavator lineup.
Unlike dozer cushion dampers such as the 8A31-54-1130 or 8A31-54-1110, which experience primarily uni-axial vibration from the powertrain, excavator engine mounts like the 17A-54-46120 must accommodate multi-directional loading as the upperstructure rotates 360 degrees on the undercarriage. This requires a compound formulation and geometry that provides controlled compliance in all three axes while maintaining sufficient stiffness to prevent excessive engine displacement during aggressive digging operations.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 17A-54-46120 |
| OEM Brand | Komatsu |
| Type | Rubber Cushion Mount / Anti-Vibration Engine Mount |
| Compatible Equipment | Komatsu PC200-8, PC200LC-8, PC210-10, PC210LC-10, PC220-8, PC240LC-10, PC270-8, PC300-8, PC300LC-8, PC350-8, PC350LC-8 |
| Cross-Reference | 17A-54-46130 (companion mount) |
| Material | Natural Rubber (NR) Compound |
| Hardness | 60 ± 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 PC200-8, PC200LC-8 — 20-tonne class hydraulic excavator
- Komatsu PC210-10, PC210LC-10 — 21-tonne class Tier 4 Final excavator
- Komatsu PC220-8 — 22-tonne production excavator
- Komatsu PC240LC-10 — 24-tonne long-reach excavator
- Komatsu PC270-8 — 27-tonne heavy-duty excavator
- Komatsu PC300-8, PC300LC-8 — 30-tonne class excavator
- Komatsu PC350-8, PC350LC-8 — 35-tonne large excavator
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 | 60 ± 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 17A-54-46120 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.
