Used Komatsu 350-7 Excavator

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Komatsu PC350-7 Crawler Excavator Detailed Introduction

1. General Overview

The Komatsu PC350-7 is a 35-ton class heavy-duty crawler excavator launched by Komatsu Ltd. in the early 2000s as the upgraded successor to the PC350-6 series. It is globally reputed for its balanced performance of high power, low operational cost, and exceptional durability, making it a popular choice for both small and large-scale heavy construction applications. It complies with EPA Tier 2 and EU Stage II emission standards, suitable for construction sites with moderate emission requirements.

2. Core Technical Specifications

Basic Parameters

Item	Specification
Operating Weight	33,600 – 35,600 kg (varies by bucket, boom and track configurations)
Standard Track Shoe Ground Pressure	67 kPa
Travel Speed	3.2 km/h (low) / 5.5 km/h (high)
Gradeability	70% (35°)
Bucket Capacity	1.4 – 1.9 m³ (customizable for earthwork, rock, or grid applications)
Fuel Tank Capacity	580 L

Powertrain

Engine Model: Komatsu proprietary SAA6D114E-2, 6-cylinder, 4-stroke, turbocharged & intercooled diesel engine
Rated Power: 184 kW (247 HP) @ 2,000 rpm
Maximum Torque: 1,080 N·m @ 1,500 rpm, with strong low-speed torque output for heavy digging conditions

Hydraulic System

Adopts Komatsu’s patented Closed-center Load Sensing System (CLSS):

Main Pump Type: 2 variable displacement piston pumps
Total Flow Rate: 492 L/min (246 L/min per pump)
Main Relief Valve Setting: 34.3 MPa
Built-in pressure compensation valves ensure smooth and precise compound movements, even under uneven load conditions.

Working Range (standard 6.47 m boom + 3.2 m stick)

Maximum Digging Depth: 7,380 mm
Maximum Digging Radius: 11,100 mm
Maximum Dumping Height: 7,110 mm
Maximum Bucket Digging Force: 273 kN

3. Key Advantages & Features

(1) High Efficiency & Low Fuel Consumption

Optimized matching between the engine and hydraulic system reduces overall fuel consumption by 10~15% compared to the previous PC350-6 model.
Two selectable working modes (Power Mode for heavy rock digging, Economy Mode for light earthmoving) allow operators to adjust performance based on working demands.
Auto idle and auto deceleration functions cut unnecessary fuel waste during standby periods.

(2) Operator-Friendly Cab Design

The cab is mounted on silicone oil shock absorbers, reducing vibration by over 30% compared to older models, with interior noise controlled below 75 dB(A).
Equipped with a fully adjustable air suspension seat, high-capacity heating and cooling air conditioning system, and low-effort pilot control joysticks to reduce fatigue during long-hour operation.
A full-color LCD monitor displays real-time operational data (fuel level, oil pressure, hydraulic oil temperature, fault codes, etc.) for easy monitoring and troubleshooting.

(3) Outstanding Durability & Reliability

Boom, stick and main frame are made of high-strength wear-resistant steel, with reinforced ribs added at high-stress points to resist deformation under heavy load.
Chassis components (track links, rollers, idlers) are subject to high-frequency quenching treatment, extending service life by 20% under harsh working conditions.
High-precision hydraulic filtration system ensures oil cleanliness, effectively extending the service life of hydraulic pumps and valves.

(4) Easy Maintenance

All daily maintenance points (oil filters, fuel filters, air filters, oil level gauges) are accessible from the ground level, avoiding the need to climb onto the upper frame for routine checks.
The radiator is designed with a side-opening structure for easy cleaning of dust and debris.
Centralized lubrication points reduce the time required for regular greasing.
Factory-set extended maintenance intervals: 500 hours for engine oil change, 4,000 hours for hydraulic oil change (when using Komatsu genuine oil).

4. Typical Applications

The PC350-7 is widely used in the following scenarios:

Large-scale earthmoving and site clearing projects
Mining, quarrying and aggregate production
Road, railway, bridge and port infrastructure construction
Demolition works (when equipped with hydraulic breakers or shears)
Forestry logging and bulk material handling (when equipped with grapples)

5. Optional Configurations

To adapt to different working demands, multiple optional configurations are available:

Extended boom and stick kits for deeper digging or higher lifting demands
Specialized buckets: rock bucket, grid bucket, trapezoidal bucket, etc.
Work attachments: quick coupler, hydraulic breaker, hydraulic shear, wood grapple, electromagnetic sucker
Chassis upgrades: wider track shoes for soft ground, track guard devices
Cab protection: FOPS (Falling Object Protective Structure), ROPS (Roll Over Protective Structure), rear view camera, heated seat

Final Note

The Komatsu PC350-7 has gained wide recognition in global markets for its stable performance and low after-sales cost. Even after being discontinued and replaced by the PC350-8 series, it remains one of the most popular models in the second-hand construction equipment market, suitable for users pursuing high cost-effectiveness for heavy-duty operations.

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Used Komatsu 350-7 Excavator

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