Used Komatsu 450-8 Excavator

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Here is a detailed introduction to the Komatsu PC450-8 hydraulic excavator in English, covering its specifications, key features, performance, technology, and applications.

Komatsu PC450-8 Hydraulic Excavator: A Comprehensive Overview

The Komatsu PC450-8 is a heavy-duty hydraulic excavator that sits in the 45-metric-ton class, designed for demanding earthmoving, quarrying, construction, and mining support operations. As part of Komatsu's Dash-8 series, it integrates advanced hydraulic technology, a powerful and fuel-efficient engine, enhanced operator comfort, and robust durability to maximize productivity and reduce operating costs.

1. Engine and Powertrain

At the heart of the PC450-8 is a Komatsu-designed, high-performance diesel engine that balances raw power with environmental responsibility.

Model: Komatsu SAA6D125E-5
Type: Water-cooled, 4-cycle, direct injection, turbocharged, aftercooled, 6-cylinder diesel engine.
Displacement: 11.04 liters (674 cu in)
Net Power:
- 257 kW (345 HP) @ 1,900 rpm (ISO 9249)
- 255 kW (342 HP) @ 1,900 rpm (SAE J1349)
Emissions Compliance: EPA Tier 3 and EU Stage IIIA compliant. The engine employs a high-pressure common rail fuel injection system, cooled exhaust gas recirculation (EGR), and a Komatsu Diesel Particulate Filter (KDPF) to significantly reduce particulate matter and NOx emissions without compromising performance.
Fuel Efficiency: The advanced electronic control system optimizes fuel delivery based on load, resulting in fuel consumption reductions of up to 10% compared to the previous Dash-7 model under typical working conditions.

The engine is paired with a robust powertrain, including a heavy-duty undercarriage designed to withstand high-impact and abrasive environments. Automatic climate-controlled hydraulic cooling fans maintain optimal operating temperatures, further improving efficiency and component life.

2. Hydraulic System

The PC450-8 features Komatsu’s proprietary HydrauMind (Hydraulic Mechanical Intelligence New Design) closed-center load-sensing hydraulic system. This system is designed to deliver exactly the amount of oil required for each function, minimizing hydraulic flow loss and maximizing fine control.

Main Pumps: Two variable-displacement axial piston pumps.
Maximum Pump Output: 2 x 380 L/min (100.4 US gal/min) at rated engine speed.
System Pressure: 37.3 MPa (5,410 psi) for implement circuits; 37.8 MPa (5,480 psi) for travel circuit.
Key Hydraulic Features:
- Pressure Proportional Control (PPC) joysticks: Provide precise, low-effort control for all front attachments.
- Multiple Work Modes: The operator can select from modes such as Power Mode (maximum production), Economy Mode (balance of power and fuel savings), Lifting Mode (smooth control and higher lifting capacity with overload warning), and Breaker/Attachment Mode (optimized flow and pressure for hydraulic attachments). These modes allow the machine to be tailored to the specific task.
- Auto Power Boost: Automatically increases digging force by up to 7% for a set duration when encountering hard ground, ensuring bucket fill without manual intervention.

3. Performance and Specifications

The PC450-8 delivers impressive breakout forces and lifting capacities, making it a versatile tool on the job site.

Operating Weight: Ranges from 44,400 kg to 45,700 kg (97,885 lbs to 100,750 lbs), depending on configuration (boom, arm, bucket, counterweight).
Bucket Capacity (Heaped): 1.80 – 2.60 m³ (2.35 – 3.40 yd³), depending on material density and bucket type.
Digging Forces (ISO):
- Arm Crowd Force: Up to 232 kN (23,660 kgf / 52,160 lbf)
- Bucket Breakout Force: Up to 286 kN (29,160 kgf / 64,280 lbf)
Working Range (with 7.0 m boom and 3.4 m arm):
- Maximum Digging Depth: 7,600 mm (24’ 11”)
- Maximum Reach at Ground Level: 11,800 mm (38’ 9”)
- Maximum Digging Height: 10,980 mm (36’ 0”)
- Maximum Dumping Height: 7,550 mm (24’ 9”)
Travel Speeds: High (5.5 km/h / 3.4 mph) and Low (3.2 km/h / 2.0 mph), with automatic shift.
Swing Speed: 9.0 rpm
Drawbar Pull: High tractive effort ensures excellent climbing ability and maneuverability on rough terrain.

4. Operator Comfort and Cab Environment

Komatsu places a strong emphasis on operator safety and comfort, as a comfortable operator is a productive operator. The PC450-8 cab is a spacious, high-visibility ROPS/FOPS-certified structure.

Cab Design: Viscous cab mounts suppress vibration and noise, with interior sound levels as low as 70 dB(A). The cab structure absorbs impact during rollovers and falling objects.
Seat: A fully adjustable, air-suspension, heated high-back seat with reclining backrest and lumbar support. The joystick consoles move independently of the seat, so the relative position remains constant.
Display and Controls: A large, high-resolution 7-inch color LCD multi-monitor provides information in multiple languages. It displays machine health, maintenance intervals, camera views, and allows on-screen adjustment of working modes and attachment settings.
Visibility: Large glass windows, a narrow cab pillar design, and a standard rear-view camera (with display on the monitor) provide excellent all-around visibility.
Climate Control: A powerful automatic air conditioning system with multi-directional vents ensures a comfortable working environment in extreme temperatures.

5. Advanced Technology and Monitoring

Komtrax™ Remote Monitoring: The PC450-8 comes standard with Komatsu’s Komtrax satellite-based communication system. It wirelessly transmits machine data—such as location, hours, fuel consumption, service alerts, and operating trends—to a secure web-based portal. This enables fleet managers to optimize utilization, schedule preventive maintenance proactively, and deter theft.
EMMS (Equipment Management Monitoring System): The onboard diagnostic system continuously monitors all critical machine functions and alerts the operator to potential issues before they become failures. Fault codes and troubleshooting guidance are displayed on the monitor.
Auto-Idle Shutdown: An easily programmable function that shuts down the engine after a set period of idling, conserving fuel and reducing unnecessary hours.

6. Maintenance and Durability

The machine is engineered for long service life and simplified, ground-level maintenance.

Modular Design: Components like the engine, hydraulic pumps, and valves are laid out for easy access.
Ground-Level Service Center: Engine oil, fuel filter, and water separator checks/changes can be performed from ground level. The radiator, oil cooler, and aftercooler are arranged in parallel for easy cleaning.
Extended Service Intervals: Engine oil and filter changes at 500 hours; hydraulic oil replacement at 5,000 hours (under normal conditions), reducing downtime and lifecycle costs.
Robust Undercarriage: The heavy-duty X-frame and reinforced track links, pins, and bushings are sealed and lubricated to resist wear. A hydraulic track adjuster with a shock-absorbing recoil spring maintains proper track tension.
Boom and Arm Construction: Fabricated from thick, high-tensile strength steel plates with castings at critical stress points and internal baffle plates for durability. Weld quality is ensured by robotic welding processes.

7. Applications and Versatility

The PC450-8 is a versatile machine suitable for a wide range of heavy-duty tasks:

Mass Excavation: High-production digging and loading of trucks in construction and quarrying.
Mining Support: Stripping overburden, trenching, and general utility work around mine sites.
Heavy Lifting: Pipe laying, setting concrete structures, and lifting heavy materials (with certified lifting points and overload alarm).
Demolition and Attachment Work: With its auxiliary hydraulic system (available in single or double-acting circuits with adjustable flow and pressure), it can efficiently power hammers, pulverizers, shears, and grapples.

Conclusion

The Komatsu PC450-8 excavator represents a well-balanced combination of high power, precise control, and economical operation. Its Tier 3 compliant engine, intelligent hydraulic system, and operator-focused design make it a reliable and productive asset in the most challenging environments. Supported by Komtrax telematics and durable construction, it remains a benchmark in the 45-ton excavator class for contractors who demand performance and low total cost of ownership.

Non flooded

No accident

Original product

Used Komatsu 450-8 Excavator

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