Hitachi EX120-3 Hydraulic Excavator Detailed Overview

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Machine Introduction
The Hitachi EX120-3 is a powerful and versatile hydraulic excavator designed for diverse construction, industrial, and dredging applications. Known for its balance of strength, mobility, and operator comfort, it is well-suited for tasks ranging from deep digging to precise material handling.
Key Specifications

• Engine: Isuzu A-4BG1T, 4-cylinder, turbocharged diesel engine
  
• Net Power: 81 hp (60 kW) at 2,100 rpm
  
• Max Torque: 231.6 lb-ft (314 Nm) at 1,600 rpm
  
• Displacement: 4.3 liters (264 cubic inches)
  
• Operating Weight: Approximately 26,000 lbs (11,794 kg)
  
• Fuel Capacity: 66.1 gallons (250 liters)
  
• Cooling System Fluid Capacity: 4.9 gallons (15 liters)
  
• Engine Oil Capacity: 4.3 gallons (16.2 liters)
  
• Hydraulic System Fluid Capacity: 35.4 gallons (134 liters)
  
• Hydraulic Pump Flow Capacity: 50.2 gallons per minute (190 liters per minute)
  
• Hydraulic System Relief Valve Pressure: 4,980 psi (34,335 kPa)
  
• Swing Drive Fluid Capacity: 0.9 gallons (3.2 liters)
  
• Swing Speed: 12.7 rpm
  
• Track Gauge: Approximately 6.6 ft (2 m)
  
• Number of Shoes per Side: 44
  
• Shoe Size: 19.7 inches (500 mm)
  
• Travel Speed: Up to 3.5 mph (5.5 km/h)
  
• Ground Pressure: 5.4 psi (37.2 kPa)
  

Boom and Digging Specifications

• Boom/Stick Option 1:
  • Max Cutting Height: 27.4 ft (8.3 m)
    
  • Max Digging Depth: 17 ft (5.2 m)
    
  • Max Reach Along Ground: 25.5 ft (7.8 m)
    
  • Max Vertical Wall Digging Depth: 15.3 ft (4.7 m)
    
• Boom/Stick Option 2:
  • Max Cutting Height: 28.1 ft (8.6 m)
    
  • Max Digging Depth: 18.3 ft (5.6 m)
    
  • Max Reach Along Ground: 26.8 ft (8.2 m)
    
  • Max Vertical Wall Digging Depth: 16.5 ft (5 m)
    
• Boom/Stick Option 3:
  • Max Cutting Height: 29.2 ft (8.9 m)
    
  • Max Digging Depth: 19.9 ft (6.1 m)
    
  • Max Reach Along Ground: 28.3 ft (8.6 m)
    
  • Max Vertical Wall Digging Depth: 18 ft (5.5 m)
    

Bucket Capacities

• Minimum Capacity: 0.25 cubic yards (0.19 cubic meters)
  
• Reference Capacity: 0.39 cubic yards (0.3 cubic meters)
  
• Maximum Capacity: 0.86 cubic yards (0.66 cubic meters)
  

Operator Comfort and Safety

• Spacious, well-ventilated cab with intuitive controls and clear display panels.
  
• Safety features include seatbelt, emergency shut-off switches, and excellent all-around visibility.
  

Additional Features

• Multiple attachment compatibility including hydraulic breakers, crushers, clamshell buckets, grapples, and rotary screening buckets.
  
• Robust undercarriage components designed for durability across varied terrains.
  
• Efficient hydraulic system allows smooth and powerful operation under demanding conditions.
  

Terminology

• Hydraulic Pump Flow: The rate at which hydraulic fluid is delivered to the system, measured in gallons per minute.
  
• Swing Speed: The rate at which the excavator’s upper structure can pivot, measured in revolutions per minute.
  
• Ground Pressure: The pressure the machine exerts on the ground, influencing mobility and soil impact.
  
• Digging Depth: The maximum vertical depth the excavator arm can reach below ground level.
  
• Boom/Stick: The primary arm sections of an excavator, controlling reach and digging ability.
  

Summary
The Hitachi EX120-3 hydraulic excavator offers a solid combination of power, reach, and versatility suitable for a variety of construction and excavation projects. With its turbocharged engine, advanced hydraulic system, and well-designed operator cab, it balances productivity with comfort and safety. Multiple boom and stick configurations provide flexibility to meet specific digging or loading challenges, supported by a range of attachments enhancing functionality. The EX120-3 remains a dependable choice for contractors requiring medium-sized excavators with proven performance.