Used Komatsu 400-8 Excavator

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Komatsu PC400-8 Crawler Excavator Detailed Introduction

The Komatsu PC400-8 is a 40-ton class heavy-duty crawler excavator developed and produced by Komatsu Ltd., the world-leading Japanese construction equipment manufacturer. As an upgraded classic model for high-load operation scenarios, it balances outstanding operation efficiency, ultra-low fuel consumption and long-term durability, and is widely used in open-pit mining, quarrying, large-scale infrastructure construction and bulk earthwork projects around the world.

Core Specifications

Parameter	Details
Operating Weight	39,500 – 42,100 kg (varies with configuration)
Standard Bucket Capacity	1.9 – 2.3 m³ (heavy-duty earthmoving bucket/rock bucket optional)
Rated Power	257 kW / 345 HP at 1,900 rpm
Emission Standard	EPA Tier 3 / EU Stage IIIA
Travel Speed	3.0 km/h (low gear) / 5.5 km/h (high gear)
Swing Speed	9.2 rpm
Max. Digging Depth (standard arm)	7,280 mm
Max. Digging Reach (standard arm)	10,920 mm
Max. Dumping Height (standard arm)	7,120 mm
Bucket Digging Force	278 kN
Arm Digging Force	219 kN

Core Performance Advantages

1. High-efficiency & Fuel-saving Power System

The PC400-8 is equipped with Komatsu's proprietary SAA6D125E-5 6-cylinder, 4-stroke, turbocharged air-to-air aftercooled diesel engine, matched with an electronically controlled common rail injection system, which can precisely adjust fuel injection volume and timing according to load conditions:

Two optional operation modes: Power (P) mode for heavy-load high-efficiency operation, Economy (E) mode reduces fuel consumption by up to 10% compared with the previous generation PC400-7 under light and medium load conditions
Standard auto-idle and auto-shutdown functions, automatically reduce engine speed or shut down when the equipment is idle for a long time, further reducing unnecessary fuel loss
Good fuel adaptability, equipped with two-stage fuel filtration and water separator, suitable for construction scenarios with unstable oil quality in remote areas

2. Precise & Smooth Hydraulic System

It adopts Komatsu's exclusive closed-center load sensing system (CLSS) and variable piston main pump, which can independently adjust the hydraulic flow of each actuator according to actual operation needs:

Pressure compensation valves are installed in each circuit, which ensures no interference between composite actions (such as simultaneous digging, swinging and lifting), and the operation accuracy is significantly improved
The maximum hydraulic system pressure reaches 34.3 MPa, providing strong and stable digging force for hard rock and heavy earthwork operations
The hydraulic oil filtration system with 5μm high precision extends the hydraulic oil replacement cycle to 5000 hours, greatly reducing maintenance costs

3. Ultra-high Structural Durability

All load-bearing structures are designed for harsh working conditions such as mines:

The boom, arm, and upper/lower frames are made of high-strength alloy steel, and all welded joints are inspected by ultrasonic flaw detection, which has strong impact resistance and fatigue resistance, and the service life is increased by more than 30% compared with similar models
The track system is made of hardened wear-resistant materials, and the service life of rollers, idlers and track shoes is extended by 35% under rock working conditions
Equipped with boom/arm overload relief valve, which automatically releases pressure when encountering hard obstacles to avoid structural damage

4. Comfortable & Safe Operating Environment

The cab is ROPS/FOPS certified, with anti-roll and falling object protection functions, which fully guarantees the safety of operators
Fully sealed pressurized cab, the internal noise is only 72 dB(A), and the dust isolation rate reaches 99%
Suspension shock-absorbing seat with multi-directional adjustment function, low-force pilot control joystick, greatly reducing the fatigue of long-term operation
7-inch high-definition color monitor, real-time display of equipment operating parameters, fault alarm and maintenance reminder, optional rear view camera to eliminate operation blind spots

5. Easy Maintenance & Intelligent Management

All daily maintenance points are arranged at ground-accessible positions, and operators can complete the inspection of oil level, coolant level and filter without climbing the car
Standard Komatsu KOMTRAX™ remote monitoring system, which can realize real-time positioning of equipment, operation data statistics, fault remote diagnosis and maintenance reminder, which is convenient for fleet management and reduces non-operation time by more than 20%

Main Application Scenarios

Open-pit mining and quarrying: ore loading, rock stripping, rubble handling
Large infrastructure construction: highway/railway subgrade construction, bridge foundation excavation, tunnel mucking
Port and logistics: bulk cargo loading and unloading, yard leveling
Municipal large-scale projects: deep foundation pit excavation, site clearing

Optional Configurations

Long-reach boom/arm set, short heavy-duty boom/arm set for mining
Multiple attachment options: rock bucket, grid bucket, hydraulic breaker, grapple, ripper
Adaptation packages for extreme environments: cold start kit, high-temperature resistant hydraulic system, desert air filtration kit
Additional safety devices: on-board fire suppression system, falling object protection net, 360° panoramic camera system

The Komatsu PC400-8 is one of the most popular 40-ton class excavators in the global market, with extremely high residual value and low total life cycle operation cost, which can meet the operation needs of various harsh scenarios.

Non flooded

No accident

Original product

Used Komatsu 400-8 Excavator

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