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The Hitachi 670 series excavator, particularly models like the ZX670LC-5G and ZX670LCH-5G, represent heavy-duty hydraulic excavators engineered for demanding mining and construction environments. Produced by Hitachi Construction Machinery, a company with roots dating back to 1910, these machines carry a reputation for robust design, durability, and advanced technology integration, supporting large-scale earthmoving and excavation projects worldwide.
Engine and Powertrain
The 670 excavator is powered by an advanced Isuzu 6WG1 engine delivering approximately 312 kW (418 HP) of net power at 1800 rpm. This turbocharged, 6-cylinder, 4-stroke, water-cooled engine employs direct fuel injection, meeting EPA Tier 4 emission standards for environmentally responsible operation. The high torque output of about 1540 Nm at 1500 rpm equips the machine to handle substantial loads with efficiency, while an advanced governor controls engine speed precisely for optimal performance.
Hydraulic System and Performance
Fuel-efficient performance is ensured by a sophisticated HIOS III hydraulic system featuring two variable displacement axial piston pumps supplying up to 2 x 475 L/min flow. Separate hydraulic circuits power the swing and travel functions via axial piston motors, delivering smooth, reliable movements. The system operates at high pressures—implement circuit at 30.9 MPa, swing at 29.4 MPa, and travel at 34.3 MPa—providing the strength required for large bucket digs and rapid cycle times.
Noteworthy features include a hydraulic boost and boom recirculation system that enhances boom and arm speeds, allowing faster digging and increased productivity. The excavator offers multiple working modes—high productivity for power-intensive tasks, power mode balancing speed and economy, and economy mode to prioritize fuel savings.
Dimensions and Operational Capabilities
Operating weight ranges between 61,750 kg to 68,200 kg depending on configuration. The excavator boasts a maximum digging reach of approximately 11.7 to over 13 meters depending on boom and arm length variations, with digging depths up to about 7 to 9 meters. Track shoe widths are typically 600 mm with options for triple grouser tracks that improve ground grip and stability on rough terrain. Travel speeds range between 0 to 5.0 km/h, adaptable to site conditions.
Operator Comfort and Safety
The cab design emphasizes operator comfort and productivity with ergonomic controls, digital and analog monitoring panels labeled "One Glance Monitor," and noise-reducing features. The cabin is robust with ample space and visibility, ensuring operator safety during long shifts. Additional amenities include an AM/FM stereo with Bluetooth connectivity and USB ports, designed to keep operators focused and comfortable.
Maintenance and Durability
Hitachi integrates easily accessible maintenance points and remote inspection capabilities to reduce downtime. Fast lubrication systems, durable undercarriage components, and reinforced structures such as the D-section skirt and strengthened upper structure ensure long machine life and resistance against harsh working environments.
Terminology Explained
Operators in mining and heavy excavation praise the ZX670 for combining power and precision. One case reported in a mining operation highlighted how the machine’s hydraulic boost feature allowed faster cycle times in tough rock strata, enhancing productivity by over 15%. Another operator emphasized the reliability of the cooling system, which maintained engine temperatures even under extreme ambient heat, preventing costly overheating shutdowns.
Summary
The Hitachi 670 excavator series embodies a balance of power, durability, and efficiency suitable for large-scale mining and construction projects. With advanced engines, a robust hydraulic system, operator-centered designs, and smart maintenance features, the ZX670 series supports high productivity and long service life. Its adaptability to different boom lengths, tracks, and working modes makes it a versatile choice in the heavy equipment market.
Engine and Powertrain
The 670 excavator is powered by an advanced Isuzu 6WG1 engine delivering approximately 312 kW (418 HP) of net power at 1800 rpm. This turbocharged, 6-cylinder, 4-stroke, water-cooled engine employs direct fuel injection, meeting EPA Tier 4 emission standards for environmentally responsible operation. The high torque output of about 1540 Nm at 1500 rpm equips the machine to handle substantial loads with efficiency, while an advanced governor controls engine speed precisely for optimal performance.
Hydraulic System and Performance
Fuel-efficient performance is ensured by a sophisticated HIOS III hydraulic system featuring two variable displacement axial piston pumps supplying up to 2 x 475 L/min flow. Separate hydraulic circuits power the swing and travel functions via axial piston motors, delivering smooth, reliable movements. The system operates at high pressures—implement circuit at 30.9 MPa, swing at 29.4 MPa, and travel at 34.3 MPa—providing the strength required for large bucket digs and rapid cycle times.
Noteworthy features include a hydraulic boost and boom recirculation system that enhances boom and arm speeds, allowing faster digging and increased productivity. The excavator offers multiple working modes—high productivity for power-intensive tasks, power mode balancing speed and economy, and economy mode to prioritize fuel savings.
Dimensions and Operational Capabilities
Operating weight ranges between 61,750 kg to 68,200 kg depending on configuration. The excavator boasts a maximum digging reach of approximately 11.7 to over 13 meters depending on boom and arm length variations, with digging depths up to about 7 to 9 meters. Track shoe widths are typically 600 mm with options for triple grouser tracks that improve ground grip and stability on rough terrain. Travel speeds range between 0 to 5.0 km/h, adaptable to site conditions.
Operator Comfort and Safety
The cab design emphasizes operator comfort and productivity with ergonomic controls, digital and analog monitoring panels labeled "One Glance Monitor," and noise-reducing features. The cabin is robust with ample space and visibility, ensuring operator safety during long shifts. Additional amenities include an AM/FM stereo with Bluetooth connectivity and USB ports, designed to keep operators focused and comfortable.
Maintenance and Durability
Hitachi integrates easily accessible maintenance points and remote inspection capabilities to reduce downtime. Fast lubrication systems, durable undercarriage components, and reinforced structures such as the D-section skirt and strengthened upper structure ensure long machine life and resistance against harsh working environments.
Terminology Explained
- Axial Piston Pumps: Hydraulic pumps that generate fluid pressure with pistons arranged parallel to the drive shaft, delivering efficient flow control.
- Governor: A device that regulates engine speed to maintain steady operation under varying loads.
- Grouser Track Shoes: Track shoes equipped with ridges (grousers) to enhance traction on soft or uneven ground.
- Boom Recirculation: A hydraulic circuit design that recycles hydraulic fluid for faster and smoother boom operation.
- EPA Tier 4: Environmental protection standards setting limits on diesel engine emissions.
Operators in mining and heavy excavation praise the ZX670 for combining power and precision. One case reported in a mining operation highlighted how the machine’s hydraulic boost feature allowed faster cycle times in tough rock strata, enhancing productivity by over 15%. Another operator emphasized the reliability of the cooling system, which maintained engine temperatures even under extreme ambient heat, preventing costly overheating shutdowns.
Summary
The Hitachi 670 excavator series embodies a balance of power, durability, and efficiency suitable for large-scale mining and construction projects. With advanced engines, a robust hydraulic system, operator-centered designs, and smart maintenance features, the ZX670 series supports high productivity and long service life. Its adaptability to different boom lengths, tracks, and working modes makes it a versatile choice in the heavy equipment market.
