Used Komatsu 450-8 Excavator

Reading: 2318

Here is a detailed introduction to the Komatsu PC450-8 hydraulic excavator (the “450-8” typically refers to the PC450-8 model from Komatsu’s Dash-8 series).

Komatsu PC450-8 Hydraulic Excavator: Detailed Overview

The Komatsu PC450-8 is a 45-tonne class hydraulic excavator designed for heavy-duty earthmoving, quarrying, mining, and large-scale construction projects. As part of Komatsu’s technologically advanced Dash-8 series, this machine delivers a proven balance of high productivity, exceptional fuel efficiency, operator comfort, and rock-solid durability. It is powered by a Komatsu-designed engine and integrated hydraulic system, ensuring seamless performance in the most demanding working conditions.

1. Engine and Performance

At the heart of the PC450-8 is a Komatsu SAA6D125E-5 diesel engine. This is a 6-cylinder, water-cooled, turbocharged and after-cooled powerplant that delivers high torque at low rpm for tough digging and lifting tasks.

Net Power: 257 kW (345 HP) @ 1,900 rpm
Displacement: 11.04 litres
Emission Compliance: EPA Tier 3 and EU Stage IIIA equivalent, utilizing advanced combustion technology without the need for exhaust after-treatment devices.
Ecot3 Technology: The engine employs Komatsu’s Ecot3 system, which combines high-pressure common-rail fuel injection, cooled exhaust gas recirculation (EGR), and a highly efficient turbocharger to reduce fuel consumption and emissions while maintaining power output.
Fuel Tank Capacity: 650 litres, enabling extended working hours between refuelling.

The engine is matched with Komatsu’s electronic control system that optimizes engine speed and pump flow based on the actual workload, contributing to a fuel-efficient operation that is a hallmark of the Dash-8 series.

2. Advanced Hydraulic System (HydrauMind)

The PC450-8 features the HydrauMind (Hydraulic Mechanical Intelligence New Design) closed-centre load-sensing system. This system is engineered for precise control and excellent multi-function performance.

Pumps: Two variable-displacement piston pumps for implement circuits, plus a gear pump for the pilot control circuit.
Maximum Pump Output: 2 × 360 L/min, providing ample hydraulic flow for powerful and fast cycle times.
Pressure Compensated Valves: Ensure that the speed of each actuator remains consistent regardless of load changes or simultaneous operation of multiple functions.
Operating Modes: The operator can select from Power, Economy, Lifting, and Breaker modes to match the machine’s performance to the specific task, maximizing efficiency.
Digging Forces:
- Arm crowd force: 225 kN (22,900 kgf)
- Bucket breakout force: 289 kN (29,500 kgf) — providing immense penetration and breakout power for hard rock and dense soils.

3. Durability and Rugged Structure

Komatsu designed the PC450-8 for the harshest working environments, with reinforced structures in critical areas.

Boom and Arm: The working equipment is manufactured from high-tensile-strength steel, with large castings at the boom foot and arm tip for superior stress distribution. Box-section structures with internal partition plates add resistance to torsional and bending loads.
Undercarriage: A robust X-frame design provides a rigid base. The track frames are heavily built, and the idlers, rollers, and sprockets are sealed and lubricated for long life.
Bucket Options: The machine is compatible with a wide range of buckets, from heavy-duty rock buckets (capacity around 2.0–2.5 m³) to larger general-purpose buckets (up to ~3.0 m³), depending on material density.
Counterweight: A substantial cast counterweight (approx. 8,500 kg) provides excellent lifting stability and balance.

4. Operator Comfort and Safety

The PC450-8 cab is a spacious, ROPS-certified (Roll-Over Protective Structure) unit designed to reduce fatigue and enhance jobsite safety.

Cab Suspension: The cab is mounted on viscous fluid dampers that absorb vibration and shocks, providing a smooth ride.
Seat: A high-back, air-suspension seat with lumbar support and heating (optional) adjusts to the operator’s weight and posture.
Visibility: Large glass areas with a narrow front-right cab pillar improve direct sightlines to the work area and right side of the machine.
Display and Controls: A 7-inch, high-resolution colour LCD monitor displays machine conditions, maintenance schedules, and the feed from the standard rear-view camera. The monitor is multi-lingual and supports easy navigation through function switches.
Climate Control: An automatic air conditioning system maintains a comfortable cabin temperature regardless of outside weather.
Low Noise: The cab interior noise level is as low as 70 dB(A), reducing operator stress and enabling clear communication.

5. Easy Maintenance and Serviceability

Komatsu has prioritized simplified maintenance to increase machine uptime.

Centralized Service Points: Engine oil, coolant, hydraulic oil checks, and grease fittings are grouped and accessible from ground level.
Wide-Opening Doors: Large gull-wing style doors on both sides of the engine compartment provide quick access to the radiator, oil cooler, air cleaner, and engine.
Self-Diagnostic System: The EMMS (Equipment Management Monitoring System) continuously monitors machine health and alerts the operator to any abnormalities before they become failures.
Extended Intervals: Hydraulic oil change intervals up to 5,000 hours and engine oil/filter intervals of 500 hours reduce service time and operating costs.
KOMTRAX Ready: The machine is equipped with Komatsu’s KOMTRAX remote monitoring system, which provides fleet managers with real-time data on machine location, hours, fuel consumption, and maintenance alerts via satellite or cellular network.

6. KOMTRAX Telematics System

The fully integrated KOMTRAX system is a standard feature that enhances fleet management. Key functions include:

Real-time Tracking: GPS-based machine location.
Operating Data: Hours, fuel burn, idle time vs. working time.
Health Monitoring: Engine and hydraulic system error codes.
Maintenance Alerts: Automatic notifications for upcoming scheduled services.
Security: Geo-fencing and curfew settings to prevent unauthorized use.

This data helps owners optimize machine utilization, reduce fuel waste, and plan preventive maintenance efficiently.

7. Key Specifications (Standard Configuration)

Item	Specification
Model	Komatsu PC450-8 (PC450LC-8 for long undercarriage)
Operating Weight	44,800 – 46,200 kg (depending on configuration)
Engine Model	Komatsu SAA6D125E-5
Net Power	257 kW / 345 HP @ 1,900 rpm
Bucket Capacity Range	1.80 – 3.00 m³ (heaped, material-dependent)
Max. Digging Depth	7,790 mm
Max. Reach on Ground	11,900 mm
Max. Cutting Height	10,880 mm
Arm Length	2,900 mm or 3,400 mm (depending on option)
Boom Length	7,060 mm
Swing Speed	9.5 rpm
Travel Speed (Low/High)	3.2 / 5.5 km/h
Drawbar Pull	370 kN
Ground Pressure	80 kPa (0.81 kg/cm²) with 600 mm shoes
Tumbler Distance	3,940 mm (standard) / 4,240 mm (LC)
Tail Swing Radius	3,610 mm
Fuel Tank	650 litres
Hydraulic Tank	188 litres (full system 380 litres)

8. Applications

The PC450-8 excels in a variety of demanding applications:

Mass Excavation: Heavy bulk earthmoving on large infrastructure projects.
Quarrying and Aggregate: Loading blasted rock, feeding crushers, and overburden removal.
Mining Support: Trenching, stockpile management, and reclamation work.
Heavy Lifting and Pipe Laying: The stable undercarriage and powerful hydraulics make it suitable for lifting heavy components.
Demolition (with attachment): When equipped with a high-reach boom or demolition arm, it can serve as a robust primary demolition machine.

In summary, the Komatsu PC450-8 is a reliable, high-production excavator that combines raw digging power with thoughtful technology, ensuring low operating costs, extended uptime, and a comfortable environment for the operator. It remains a popular choice for contractors who demand both performance and durability in the 45-tonne class.

Non flooded

No accident

Original product

Used Komatsu 450-8 Excavator

RELATED PRODUCTS

Komatsu 220-8

Komatsu 200-8

Komatsu 400-8

Komatsu 450-8