Used Komatsu 400-8Excavator

Reading: 13

📌 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.

Would you like more details on any specific aspect (e.g., attachment options, maintenance, pricing, or comparison with competitors like CAT 340/345)?