Used Komatsu 400-8 Excavator

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📌 1. OVERVIEW

The Komatsu PC400-8 is a 40-ton class (large) hydraulic excavator manufactured by Komatsu Ltd., one of the world's largest construction equipment makers. It is the successor to the popular PC400-7 and belongs to Komatsu's -8 generation lineup, featuring advanced technology, improved fuel efficiency, and compliance with Tier 4 Final / Stage IIIB emission standards.

It is designed for heavy-duty operations in mining, quarrying, large-scale earthmoving, and heavy construction projects.

📌 2. ENGINE SPECIFICATIONS

Parameter	Details
Engine Model	Komatsu SAA6D125E-5
Type	6-cylinder, inline, turbocharged, aftercooled diesel
Displacement	11.98 liters
Rated Power	~235 kW (315 hp) @ 2,000 rpm
Max Torque	~1,324 N·m @ 1,400 rpm
Emission Standard	EPA Tier 4 Final / EU Stage IIIB
Aftertreatment	DPF (Diesel Particulate Filter) + SCR (Selective Catalytic Reduction) + DOC (Diesel Oxidation Catalyst)
Fuel Tank Capacity	~620 liters (163.8 US gal)

The SAA6D125E-5 engine is known for its reliability, durability, and fuel efficiency, making it ideal for long-hour operations.

📌 3. OPERATING WEIGHT & DIMENSIONS

Parameter	Value
Operating Weight	~39,800 – 40,800 kg (87,740 – 89,950 lbs)
Transport Length	~10,940 mm (35 ft 11 in)
Transport Width	~3,190 mm (10 ft 6 in)
Transport Height	~3,290 mm (10 ft 10 in)
Ground Clearance	~470 mm (18.5 in)
Track Width	600 mm / 700 mm (24 in / 28 in) optional
Track Shoe Width	700 mm (28 in)

📌 4. HYDRAULIC SYSTEM

Parameter	Details
Pump Type	Double variable-displacement axial piston pump
Max Flow Rate	2 × 276 L/min (total ~552 L/min)
Operating Pressure	34.3 MPa (5,000 psi)
Swing System	Variable displacement motor with pilot-operated check valve
Travel Motor	Variable displacement axial piston motor (each side)

The hydraulic system is designed for smooth, precise control and high productivity even under heavy loads.

📌 5. WORKING RANGE & PERFORMANCE

Parameter	Value (approx.)
Max Digging Depth	~6,980 mm (22 ft 11 in)
Max Digging Reach	~10,830 mm (35 ft 6 in)
Max Dumping Height	~7,500 mm (24 ft 7 in)
Max Dumping Reach	~10,150 mm (33 ft 4 in)
Max Vertical Wall Digging Depth	~5,960 mm (19 ft 7 in)
Max Digging Force (Boom)	~255 kN (57,300 lbf)
Max Breakout Force (Arm)	~175 kN (39,300 lbf)
Swing Speed	~7.8 rpm
Travel Speed	~4.8 km/h (3.0 mph)

📌 6. BUCKET CAPACITIES

Bucket Type	Capacity ( heaped )
Standard / General Purpose	1.4 – 1.8 m³ (1.8 – 2.4 yd³)
Rock Bucket (Heavy Duty)	1.2 – 1.6 m³ (1.6 – 2.1 yd³)
Wide Bucket (Cleaning)	1.8 – 2.0 m³ (2.4 – 2.6 yd³)

📌 7. KEY FEATURES & TECHNOLOGY

Feature	Description
🖥️ KOMTRAX	GPS-based remote machine monitoring system — tracks location, fuel consumption, operating hours, maintenance alerts, etc.
🟢 ECO Mode	Automatically adjusts engine speed to match load demand, saving up to 10–15% fuel vs. standard mode
🎮 Smart Machine Control (Optional)	GPS/3D machine guidance system for automatic grading, digging, and trenching — increases accuracy & productivity
🔧 Auto Idle Shutdown	Engine automatically shuts off after preset idle time to save fuel
💺 Comfortable Cab	ROPS/FOPS certified, air-conditioned, heated seat, LCD monitor, joystick controls, excellent visibility
🔊 Low Noise Design	Engine hood and cabin insulation reduce noise to ~73 dB(A)
🛡️ Heavy-Duty Undercarriage	Reinforced frame, X-frame structure for durability in tough conditions
🔄 Quick Coupler Ready	Optional hydraulic quick coupler for fast attachment changeover

📌 8. APPLICATIONS

Industry	Use Cases
& Mining	Loading trucks, bench digging, overburden removal
🪨 Quarrying	Rock excavation, loading, breakout work
🏗️ Heavy Construction	Foundation excavation, deep digging, pipe laying
🛣️ Road Building	Earthmoving, grading, ditch digging
🏗️ Demolition	With hydraulic breaker or crusher attachment
🌊 Dredging	With special long-reach or dredge bucket

📌 9. COMPARISON: PC400-8 vs PC400-7

Feature	PC400-7 (Old)	PC400-8 (New)
Engine	SAA6D114E-3	SAA6D125E-5
Power	~228 kW (306 hp)	~235 kW (315 hp)
Emission	Tier 3 / Stage IIIA	Tier 4 Final / Stage IIIB
Fuel Efficiency	Baseline	~10–15% improvement
ECO Mode	❌	✅
Smart Machine Control	❌	✅ Optional
KOMTRAX	✅	✅ Enhanced
Weight	~39,000 kg	~40,000 kg

📌 10. SUMMARY

Category	Rating
Power	⭐⭐⭐⭐⭐ (315 hp)
Productivity	⭐⭐⭐⭐⭐ (Large bucket, high breakout force)
Fuel Efficiency	⭐⭐⭐⭐⭐ (ECO mode, advanced engine)
Durability	⭐⭐⭐⭐⭐ (Built for mining & heavy use)
Operator Comfort	⭐⭐⭐⭐⭐ (Modern cab, low noise)
Technology	⭐⭐⭐⭐⭐ (KOMTRAX, Smart Machine Control ready)

📌 CONCLUSION

The Komatsu PC400-8 is a top-tier 40-ton excavator that combines raw power, fuel efficiency, advanced technology, and operator comfort. It is the go-to machine for contractors and mining companies who need a reliable, productive, and emission-compliant large excavator. With optional Smart Machine Control and KOMTRAX, it represents the cutting edge of construction technology.

⚠️ Note: Exact specifications may vary slightly by region and configuration. Always refer to the official Komatsu product brochure for precise data.

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