Used Komatsu 400-8R Excavator

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Komatsu PC400-8R Crawler Excavator Detailed Introduction

The Komatsu PC400-8R is a 40-ton class heavy-duty crawler excavator developed by global leading construction equipment manufacturer Komatsu Ltd. The suffix "R" stands for "Robust", meaning it is upgraded with reinforced structural components on the basis of the classic PC400 series, tailored for high-intensity harsh working scenarios such as mining, quarrying, large-scale earthmoving and heavy construction works, balancing outstanding power, fuel efficiency, durability and low operating cost.

1. Core Specifications

Item	Parameter
Operating Weight	39,500 – 41,800 kg
Standard Bucket Capacity	1.9 – 2.7 m³ (can be matched with 3.0 m³ heavy-duty bucket for loose material works)
Gross Power	257 kW / 345 HP @ 2,000 rpm
Max Digging Depth	7,320 mm (standard boom/arm configuration)
Max Digging Reach	11,190 mm
Max Dumping Height	7,820 mm
Swing Speed	9 rpm
Max Swing Torque	148 kN·m
Travel Speed	3.2 km/h (low) / 5.5 km/h (high)
Gradeability	70% (35°)
Emission Standard	EU Stage IIIA / US EPA Tier 3

2. Engine Performance

The PC400-8R is equipped with Komatsu proprietary SAA6D125E-5 6-cylinder, 4-stroke, water-cooled, turbocharged and aftercooled diesel engine:

Adopts electronic controlled common rail fuel injection technology and variable geometry turbocharger, delivering high torque at low rotation speed, with 10~15% lower fuel consumption compared to the previous PC400-7 model under the same working load.
Built-in auto idle and auto shutdown functions, reducing unnecessary fuel waste during idle periods.
Equipped with 3-stage fuel filtration system, adapting to low-quality fuel in remote construction sites, effectively reducing engine failure risks.

3. Hydraulic System

It adopts Komatsu's exclusive HydrauMind Closed-center Load Sensing System (CLSS):

Precisely distributes hydraulic flow according to actual operation demands, minimizing pressure loss, ensuring smooth coordination of compound actions (simultaneous boom lifting, swinging and bucket operation).
Three optional working modes to match different scenarios:
- P (Power) Mode: Full power output for heavy-load mining and hard rock excavation
- E (Economy) Mode: Optimized power output for common earthmoving works, reducing fuel consumption by up to 10%
- L (Lifting) Mode: Stable low-speed output for heavy lifting operations
Reinforced hydraulic piping and sealing components, with 2μm high-precision hydraulic filtration, extending hydraulic component service life by 30% compared to similar models.

4. Operator Comfort & Safety

The cab is certified with ROPS (Roll Over Protective Structure) and FOPS (Falling Object Protective Structure), meeting global construction safety standards.
Fully adjustable air-suspension shock-absorbing seat, ergonomic control joysticks with low operating force, reducing operator fatigue during long-time works.
Cab internal noise is controlled below 75 dB(A), with fully automatic climate control system and multi-direction air vents, maintaining comfortable working temperature.
High-definition color monitor displays real-time operating parameters, fault alerts and maintenance reminders; standard rear-view camera eliminates blind spots during reversing and swinging.
Hydraulic safety lock lever: All hydraulic actions are locked when the lever is lifted, effectively preventing misoperation.

5. Durability & Maintenance Convenience

Boom, arm and bucket are made of high-tensile strength steel, with stress relief treatment after welding, resisting impact and deformation under long-term heavy load works.
X-type undercarriage frame, thickened sealed lubricated track plates, and protected travel motors, adapting to rough mining and quarry ground conditions, extending undercarriage service life by 25%.
All maintenance points are designed to be accessible from the ground: Oil filters, fuel filters, hydraulic oil return filters are all arranged on the side of the pump compartment, no need to climb the machine for daily maintenance.
Standard KOMTRAX telematics system: Supports remote monitoring of equipment location, operating hours, fuel consumption and fault codes, facilitating fleet management and preventive maintenance.
Long maintenance intervals: Engine oil change every 500 working hours, hydraulic oil change every 5,000 working hours, greatly reducing equipment downtime.

6. Application Scenarios

The PC400-8R can be matched with a variety of attachments (hydraulic breaker, ripper, grapple, hydraulic shear, etc.), and is widely used in:

Open-pit mining stripping and ore loading works
Quarry rock excavation and aggregate loading
Large-scale infrastructure construction (highways, railways, water conservancy projects)
Port bulk cargo handling and construction waste disposal
Forestry land clearing and heavy lifting operations

It is one of the most popular 40-ton class heavy excavators in the global market, widely recognized for its ultra-high reliability and low full-life-cycle operating cost.

Non flooded

No accident

Original product

Used Komatsu 400-8R Excavator

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