Kobelco SK310LC-12: A Heavy-Duty Tool in the 31-ton Class, a Benchmark Work of Mechanical Precision and Efficient Operation
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In the 31-ton medium-sized excavator market, the Kobelco SK310LC-12 has become the core equipment for complex working conditions such as large-scale earth and stone excavation, mining operations, and municipal infrastructure construction, with its fully strengthened mechanical configuration, strong heavy-duty performance, and excellent fuel economy. As the core model of Kobelco Construction Machinery's iterative upgrade, it inherits the brand's low fuel consumption genes and achieves all-around optimization on core mechanical components such as the power system, hydraulic control, chassis structure, and working device, balancing efficient operation and long-term durability, highlighting Kobelco's profound accumulation and ingenuity in the field of construction machinery manufacturing.
The power system is the core of the SK310LC-12's combat effectiveness. It is equipped with a Cummins B7 four-stroke water-cooled engine, adopting an overhead camshaft, direct injection technology, and built-in intercooled turbocharging design, with a displacement of 6.7L, a cylinder bore and stroke of 107mm×124mm, a rated power stably at 180kW/2000min⁻¹, and a maximum torque of 949N·m/1200~1800min⁻¹, perfectly complying with the National IV emission standards. The engine is equipped with a triple exhaust treatment system of DPF+SCR+DOC, which can effectively filter exhaust particulates and reduce pollutant emissions, and can operate stably without frequent maintenance; combined with a fan suction cooling system, it can automatically adjust the heat dissipation efficiency according to working conditions, avoid high-temperature overload, and greatly extend the service life of the engine. At the same time, the model is equipped with a 24V/70A alternator, a 24V/7.5kW starter motor, and two sets of 12V/135Ah batteries, forming a stable power supply system. Combined with automatic idle speed, automatic idle stop, and H/S/E mode switching functions, it further reduces invalid fuel consumption, and the production efficiency is 10% higher than that of the previous generation model.
As the "transmission center" of the excavator, the hydraulic system directly determines the operation precision and heavy-duty efficiency. The SK310LC-12 is equipped with a newly developed hydraulic control system independently developed by Kobelco, combined with high-quality hydraulic pumps and main control valves. The maximum flow rate of the main pump can reach 2×245L/min, the pressure of the travel hydraulic circuit is 34.3MPa, and the pressure of the swing hydraulic circuit is 29.0MPa, which can efficiently and accurately transmit the engine power to each executive component. The system strengthens the design of the regeneration circuit. When the boom descends, it can convert gravitational potential energy into the power for the arm to lift outward, greatly improving energy efficiency; at the same time, it optimizes the piping design, adopts low-resistance joints, reduces excess pressure loss, and further improves fuel utilization efficiency. The model is standard equipped with VG46 hydraulic oil, the hydraulic oil tank capacity is 250.6L, combined with hydraulic breaker piping with return oil filter, which can effectively prevent impurity intrusion and avoid wear of hydraulic components; the torque of the swing motor is 14% higher than that of the previous generation, the operation cycle time is shortened by 5%, and the hourly earthwork volume is increased by 6%, greatly improving the efficiency of heavy-duty operations.
The chassis and working device are the "hardcore bones and muscles" of the SK310LC-12 to cope with heavy-duty working conditions. The total operating weight of the whole machine is 31200kg, and it achieves super-strong load-bearing capacity and durability through reinforced structure design. The working device adopts an HD-level boom and arm, with a boom length of 6.2m and an arm length of 3.1m. The key parts are thickened with steel plates, and the welding process is upgraded, which significantly improves the structural rigidity and impact resistance, and can easily cope with the operational impact of hard working conditions. The standard bucket capacity is 1.6m³. The optimized low-resistance bucket design reduces excavation resistance and improves fuel utilization efficiency, adapting to the excavation needs of different materials; the arm digging force is 125kN (137kN when supercharged), and the bucket digging force is 184kN (203kN when supercharged), with strong digging performance.
In terms of the chassis, the model is equipped with 600mm or 800mm equal-height crawler tracks. Three crawler adjusters on each side can prevent deformation caused by stone collision and avoid crawler link detachment; the undercarriage guard is thickened, and the left and right side covers of the upper frame and the engine cover are fully strengthened, which can comprehensively resist the impact of rocks or ground protrusions during operation; the maximum traction force is 279kN, the travel speed is divided into two gears: 3.2km/h and 5.3km/h, the maximum climbing capacity is 70% (35°), adapting to the movement needs of different operation scenarios. The working device can cooperate efficiently when driving on steep slopes, improving operational stability.
The mechanical optimization of control and safety makes the operation experience of this heavy-duty model more advantageous. The cab adopts a high-strength ROPS protective structure, standard equipped with a suspended air suspension seat with excellent shock absorption, which can effectively reduce fatigue during long-term heavy-duty operations; the cab is equipped with a 10-inch extra-large color LCD, integrating equipment operation parameters, maintenance time display and rear camera image, and can be optionally equipped with a 270° surround view system to clearly grasp the surrounding environment. The operation knob integrates multiple functions, which can be easily operated even with gloves. In addition, the model is equipped with safety components such as a pump emergency mode and an emergency manual valve for lowering the working device. It is standard equipped with Kobelco's remote intelligent management system "Tanwang System 2.0", which can real-time monitor the operation status of the machine, comprehensively ensure the safety of operators and equipment, and facilitate daily maintenance.
Every mechanical design of the Kobelco SK310LC-12 is centered on "efficiency, durability, and precision". From the powerful power of the Cummins B7 engine to the precise and controllable hydraulic system, and then to the reinforced chassis and working device, each component has been carefully adjusted. With its strong heavy-duty performance, excellent fuel economy, and long-term durability, it has become a performance benchmark in the 31-ton excavator market, providing reliable mechanical support for large-scale engineering construction, and also highlighting Kobelco Construction Machinery's professional strength and ingenuity pursuit in the field of mechanical manufacturing.
CN Used Machinery buyer update
In the 31-ton medium-sized excavator market, the Kobelco SK310LC-12 has become the core equipment for complex working conditions such as large-scale earth and stone excavation, mining operations, and municipal infrastructure construction, with its fully strengthened mechanical configuration, strong heavy-duty performance, and excellent fuel economy. As the core model of Kobelco Construction Machinery's iterative upgrade, it inherits the brand's low fuel consumption genes and achieves.
This update adds practical context for overseas buyers who use industry news to compare excavators, loaders, road machines, trucks, and other construction equipment before purchase.
Key Takeaways
- Use this topic to compare machine demand, brand positioning, and likely resale interest before choosing equipment.
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Inspection Questions
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FAQ
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No. It should support research, but buyers should still confirm the exact machine condition before payment.
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