Used Komatsu 400-8 Excavator

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📋 Overview

The Komatsu PC400-8 is a large-class hydraulic excavator in the 40-ton (36–41 tonne) category. It belongs to Komatsu's "-8" generation series, launched around 2016–2017 as the successor to the PC400-7. It is designed for heavy-duty applications such as mining, large-scale earthmoving, quarrying, and infrastructure projects.

& Engine Specifications

Parameter	Details
Engine Model	Komatsu SAA6D125E-5
Type	6-cylinder, inline, turbocharged, aftercooled diesel
Displacement	12.5 liters (763 cu in)
Rated Power	297 kW (398 hp) @ 1,800 rpm
Max Torque	~1,720 Nm (1,269 lb-ft) @ 1,200 rpm
Emission Standard	🇺🇸 EPA Tier 4 Final / 🇪🇺 EU Stage IV
Emission Technology	SCR (Selective Catalytic Reduction) + DPF (Diesel Particulate Filter) — No EGR
Fuel Tank Capacity	~600 L (158.5 US gal)

✅ The -8 series engine uses SCR+DPF instead of EGR, resulting in better fuel efficiency, lower maintenance, and cleaner operation compared to the -7 series.

📐 Dimensions & Weight

Parameter	Specification
Operating Weight	39,500 – 41,000 kg (87,080 – 90,390 lbs) (varies by configuration)
Transport Length	~10,970 mm (36 ft)
Transport Width	~3,190 mm (10 ft 6 in)
Transport Height	~3,250 mm (10 ft 8 in)
Track Width	600 mm (23.6 in)
Ground Pressure	~72 kPa (10.4 psi)
Undercarriage	Triple grouser shoes

🪣 Bucket & Performance

Parameter	Specification
Standard Bucket Capacity	1.6 – 1.9 m³ (2.1 – 2.5 yd³)
Maximum Bucket Capacity	Up to 2.1 m³ (2.7 yd³)
Max Digging Depth	~7,250 mm (23.8 ft)
Max Digging Reach	~10,300 mm (33.8 ft)
Max Dumping Height	~7,500 mm (24.6 ft)
Max Dumping Reach	~7,100 mm (23.3 ft)
Max Vertical Wall Digging	~6,150 mm (20.2 ft)
Max Cutting Height	~10,100 mm (33.1 ft)

🔧 Hydraulic System

Parameter	Specification
Main Pump Type	Variable displacement axial piston pump × 2
Total Hydraulic Flow	~640 L/min (169 US gpm)
Operating Pressure	34.3 MPa (4,975 psi)
Hydraulic System	KPCS (Komatsu Power Control System) — Load-sensing, flow-sharing
Swing System	Hydraulic motor with auto-deceleration
Travel Motors	Variable displacement axial piston motors × 2

🧠 The KPCS system allows simultaneous operation of multiple functions with optimal power distribution, improving cycle times and fuel efficiency.

🖥️ Key Technologies & Features (-8 Series Highlights)

Feature	Description
🤖 Intelligent Machine Control (iMC)	GPS/GNSS-based 3D machine guidance — auto-grade, auto-dig, auto-swing. Dramatically improves accuracy & productivity.
📡 KOMTRAX	Remote telematics — real-time machine monitoring, diagnostics, fuel tracking, maintenance alerts.
🌿 ECO Mode	Automatic power mode selection — reduces fuel consumption by up to 10–15% in light-load conditions.
🔇 Auto Idle Shutdown	Engine automatically idles down after 5 seconds of inactivity — saves fuel & reduces noise.
💡 LED Work Lights	Brighter, longer-lasting, lower power consumption than halogen.
🖥️ Touchscreen Monitor	10.1-inch full-color LCD display (optional) — shows camera, GPS, machine info.
📹 Rearview Camera	Standard — improves safety around the machine.
❄️ Climate-Controlled Cab	ROPS/FOPS certified, air conditioning, heated seat, USB charging.
🛢️ Auto-Grease System	Automatic centralized lubrication — reduces downtime.
🛡️ No EGR System	Cleaner, more reliable — less soot, no EGR cooler clogging.

📊 Performance Comparison: PC400-8 vs PC400-7

Parameter	PC400-7 (Old)	PC400-8 (New)	Improvement
Engine Power	294 kW (394 hp)	297 kW (398 hp)	+1%
Emission System	EGR + DPF	SCR + DPF (No EGR)	✅ More reliable
Fuel Efficiency	Baseline	~10% better	✅ Significant savings
Technology	Basic	iMC, KOMTRAX, ECO	✅ Major upgrade
Operating Weight	~40,000 kg	~39,500–41,000 kg	Similar
Maintenance Cost	Higher (EGR issues)	Lower	✅ Less downtime

🏗️ Typical Applications

Application	Details
🏔️ Mining & Quarrying	Large-scale rock excavation, loading
🏗️ Heavy Earthmoving	Road construction, dam building, land clearing
🏗️ Infrastructure	Pipeline trenching, foundation work
🪨 Demolition	With hydraulic breaker or grapple attachments
🌲 Forestry	With specialized grapple or shear attachments
🔄 Material Handling	With magnet, grapple, or clamshell bucket

🔩 Common Attachments

Attachment	Use
🪨 Hydraulic Breaker (Hammer)	Rock breaking, concrete demolition
🦾 Hydraulic Shear	Steel cutting, demolition
🧲 Electromagnetic Chuck	Scrap metal handling
🪵 Grapple	Log/debris handling
🪣 Tiltrotator	Versatile bucket rotation
🔌 Quick Coupler	Fast attachment changeover

💰 Approximate Pricing (2024 Estimate)

Configuration	Price Range (USD)
New Machine (Base)	$350,000 – $450,000
With iMC/GPS Package	$420,000 – $520,000
Used (2017–2020, 5,000–8,000 hrs)	$180,000 – $300,000

(Prices vary significantly by region, dealer, configuration, and market conditions)

✅ Summary — Why Choose the PC400-8?

✅ Strength	Explanation
💪 Powerful & Reliable	398 hp, proven SAA6D125E-5 engine
⛽ Fuel Efficient	~10% better than -7 series via ECO mode & SCR tech
🧠 Smart Technology	iMC-ready, KOMTRAX, touchscreen monitoring
🔧 Low Maintenance	No EGR = fewer breakdowns, less soot
📈 High Productivity	KPCS hydraulics + large bucket = fast cycles
🌎 Emission Compliant	Tier 4 Final / Stage IV — works globally

📌 Bottom Line: The Komatsu PC400-8 is one of the most technologically advanced, fuel-efficient, and productive 40-ton excavators on the market. It's the go-to choice for contractors who need maximum uptime, precision, and low operating costs in demanding environments.

Would you like more details on any specific aspect — such as attachment compatibility, maintenance schedule, or comparison with competitors (CAT 345, Hitachi ZX470, Volvo EC480)? 😊