Used Komatsu 400-7 Excavator

Reading: 2020

Komatsu PC400-7 Crawler Excavator Detailed Introduction

The Komatsu PC400-7 is a heavy-duty crawler excavator developed and manufactured by Komatsu Ltd. (Japan), the 7th generation of the classic PC400 series, launched in the early 2000s. It is positioned for high-load, long-cycle operation scenarios, and is widely recognized as one of the most reliable 40-ton class excavators in the global engineering machinery market.

1. Core Specifications

Item	Parameter
Operating Weight	39,300 – 41,400 kg
Standard Bucket Capacity	1.9 – 2.3 m³ (customizable for earthmoving/rock/gravel scenarios)
Engine Model	Komatsu SAA6D125E-3 turbocharged, intercooled 6-cylinder diesel engine
Rated Net Power	257 kW (345 HP) @ 1,900 rpm
Emission Standard	EU Stage II / US Tier 2
Max Bucket Digging Force	232 kN
Max Arm Digging Force	178 kN
Max Digging Depth (standard boom/arm)	7,800 mm
Max Digging Height	10,900 mm
Max Dumping Height	7,300 mm
Travel Speed	3.3 km/h (low) / 5.5 km/h (high)
Max Gradeability	35° (70% slope)
Hydraulic System	Closed-center Load Sensing System (CLSS), dual variable piston pumps, total flow 492 L/min

2. Key Technological Features

(1) High Efficiency Powertrain Matching

The electronically controlled injection engine is paired with Komatsu’s exclusive hydraulic system matching algorithm, which reduces fuel consumption by 10~15% compared with the previous PC400-6 model, while maintaining unchanged output power.
Equipped with auto idle and auto deceleration functions, which automatically lower engine speed during standby to reduce unnecessary fuel loss.

(2) Heavy-duty Structural Durability

The boom, arm and main frame are made of high-strength alloy steel, with reinforced welding at stress concentration points, which can withstand long-term impact loads in mining and quarry scenarios.
The heavy-duty undercarriage adopts wear-resistant track shoes, reinforced supporting rollers and idlers, with a service life 30% longer than similar products under harsh working conditions.

(3) Precise Hydraulic Control

The CLSS closed load sensing system ensures smooth composite action (simultaneous boom lifting, arm retraction, swing), with zero lag in operation response, and can maintain stable control even under variable load conditions.

3. Operator Experience

The cab adopts a fully sealed pressurized design, with a silicone oil shock absorption base, and the internal operating noise is controlled below 75 dB(A).
Standard ROPS (Roll-over Protective Structure) and optional FOPS (Falling Object Protective Structure) certification, which ensures operator safety in mining and demolition scenarios.
Equipped with adjustable air suspension seat, fully automatic air conditioning, ergonomic pilot control joysticks, and a multi-functional LCD display that shows real-time operating parameters, fault codes and maintenance reminders.

4. Maintenance & Fleet Management

All routine maintenance points (oil filter, fuel filter, hydraulic oil filter, lubrication points) are arranged at ground-accessible positions, which reduces maintenance time by 40% compared with older models.
Equipped with Komatsu’s proprietary KOMTRAX telematics system, which supports remote tracking of equipment location, operating hours, fuel consumption, and maintenance alerts, making it easy for fleet managers to carry out unified scheduling.
Extended maintenance intervals: hydraulic oil replacement cycle up to 4,000 hours, engine oil replacement cycle up to 500 hours, which reduces long-term operating costs.

5. Typical Application Scenarios

Large-scale infrastructure construction: earth excavation, foundation construction for highways, railways, hydropower stations and airports
Mining and quarrying: ore stripping, bulk ore loading and unloading, rock excavation
Large-scale demolition: matched with hydraulic breakers, hydraulic shears and other attachments for building demolition
Port and logistics: bulk cargo (coal, ore, sand) loading and unloading
Forestry engineering: land clearing, stump removal

6. Market Advantages

Extremely high reliability: low failure rate under continuous high-load operation, with an average overhaul cycle of more than 15,000 hours
Global after-sales and parts supply network: original and副厂 (aftermarket) parts are easily available in most countries and regions, with low maintenance costs
High residual value: the second-hand resale price is 10~20% higher than other 40-ton class excavators of the same age, with strong asset retention capacity