Used Komatsu 400-8R Excavator

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Komatsu PC400-8R Heavy-Duty Crawler Excavator: Detailed Introduction

Overview

The Komatsu PC400-8R is a 40-ton class heavy-duty crawler excavator developed and manufactured by Komatsu Ltd., a global leader in construction and mining equipment. As a core model of Komatsu's reliable -8R product line, it is purpose-built for high-load, long-duration operation scenarios, balancing outstanding productivity, low operational cost, exceptional durability and operator comfort. It complies with EU Stage IIIA / US EPA Tier 3 non-road emission regulations, with optimized components to adapt to harsh working environments and unstable fuel quality in emerging markets.

Key Technical Specifications

Item	Parameter
Operating Weight	39,500 – 42,500 kg (varies by bucket, track shoe and front attachment configuration)
Engine Model	Komatsu SAA6D125E-5, 6-cylinder inline, turbocharged, air-to-air aftercooled
Rated Gross Power	257 kW / 345 HP @ 1,900 rpm
Displacement	11.04 L
Bucket Capacity Range	1.9 – 2.7 m³ (standard rock bucket: 2.1 m³)
Max. Digging Depth (standard boom)	6,950 mm
Max. Digging Reach (standard boom)	10,920 mm
Max. Dumping Height (standard boom)	7,110 mm
Travel Speed	3.2 km/h (low) / 5.5 km/h (high)
Swing Speed	9.2 rpm
Gradeability	70% / 35°
Hydraulic System Operating Pressure	35.3 MPa
Max. Bucket Breakout Force	246 kN
Max. Arm Breakout Force	196 kN

Core Performance Advantages

1. High Efficiency & Low Fuel Consumption

Equipped with Komatsu's proprietary HydrauMind closed-center load-sensing hydraulic system, which provides precise flow matching for multiple simultaneous operations (digging, swinging, lifting) without speed lag or power loss, greatly improving operation smoothness.
Offers 2 selectable working modes: Power Mode (P mode) for maximum breakout force in heavy rock digging and high-speed loading; Economy Mode (E mode) for 10-15% lower fuel consumption in light to medium duty tasks, without sacrificing productivity.
Built-in auto-idle and auto-shutdown functions reduce unnecessary fuel waste during idle periods.

2. Extreme Durability for Harsh Scenarios

Front working devices (boom, arm) are made of high-tensile thick steel plates, with all welding joints treated by stress relief process to avoid cracking under long-term impact loads. Heavy-duty reinforced boom/arm packages are available for quarry and mining operations.
Undercarriage adopts heavy-duty welded track frames, double-sealed track pins, and reinforced idlers, carrier rollers and track shoes, effectively preventing sand, dust and mud from entering running components, extending undercarriage service life by 20% compared to the previous generation PC400-7.
Parallel cooling system with anti-clogging radiator design ensures stable operation even in 45°C high ambient temperature environments.
Two-stage high-efficiency fuel filtration system reduces engine failure risk caused by low-quality fuel, suitable for remote construction sites with insufficient fuel supply.

3. Operator Comfort & Safety

The cab is certified with ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure), providing all-round safety protection for operators.
Fully sealed and sound-insulated cab keeps internal noise level below 75 dB(A), greatly reducing operation fatigue.
Air-suspended adjustable seat with optional heating function, low-effort electronic control joysticks with short stroke, and large-capacity air conditioning system ensure comfortable operation in extreme cold or hot environments.
7-inch color LCD monitor displays real-time operating parameters (fuel level, water temperature, hydraulic oil temperature, fault codes, etc.) clearly. Optional rear-view camera or 360° surround view system eliminates operation blind spots.

4. Easy Maintenance & Smart Management

All daily maintenance points (oil filter, fuel filter, hydraulic return filter, air filter, etc.) are arranged at ground-accessible positions, no need to climb on the upper structure for routine service, saving maintenance time.
Standard equipped with Komatsu's exclusive KOMTRAX remote monitoring system, which supports real-time tracking of equipment location, operating hours, fuel consumption, fault warnings and maintenance reminders for fleet managers, effectively reducing unplanned downtime.
Extended maintenance intervals: engine oil replacement every 500 operating hours, hydraulic oil replacement every 5,000 operating hours, greatly reducing long-term operation costs.

Typical Application Scenarios

The PC400-8R is widely used in:

Open-pit mining, quarry rock stripping and loading operations
Large-scale infrastructure construction: highways, railways, hydropower dams, airport earthworks
Bulk cargo handling in ports and logistics yards
Forest land clearing and heavy earth moving
Demolition operations when fitted with hydraulic breakers

Optional Configurations

Users can select customized configurations according to operation needs:

Various bucket types: heavy-duty rock bucket, clean-up bucket, light material bucket
Extended boom/arm packages for long-reach operations
Hydraulic breaker pipeline, quick coupler for fast attachment replacement
Reinforced track shoes (triple-grouser rock shoes, widened shoes for soft ground)
Cold zone package: engine oil heater, battery heater, cold start assist system
High temperature operation package: enlarged radiator, dust-proof grille
Automatic centralized lubrication system
360° surround view system, collision avoidance system

Market Competitiveness

Backed by Komatsu's global after-sales service network and abundant spare parts supply, the PC400-8R has a high residual value and low life-cycle cost, making it the preferred choice for mining operators, large construction contractors and rental companies pursuing high reliability and long-term returns.

Non flooded

No accident

Original product

Used Komatsu 400-8R Excavator

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