Used Hitachi 350-3G Excavator: A Cost-Effective Choice with Unwavering Performance

With the construction machinery market remaining hot, used equipment, with its high cost-effectiveness and quick commissioning, has become a top choice for small and medium-sized construction companies. Hitachi Construction Machinery’s classic 350-3G model, professionally refurbished and tested, boasts uncompromised core performance and manageable operating costs, making it an essential choice for mining, municipal construction, and other fields. This machine, which once achieved a record of 15,000 hours of continuous operation without a major overhaul, has been conditioned at an officially certified used equipment center, retaining its original power and structural advantages, making it a reliable choice for companies seeking efficient construction despite limited budgets.

Performance: Power and Stability

The Isuzu 6HK1 engine in the Hitachi 350-3G is recognized in the industry as a benchmark for durability. The 7.8L inline six-cylinder turbocharged engine is rated at 197kW (268PS) and delivers 980Nm of torque at 1500rpm. Even after years of use, power degradation remains below 10%. In field tests at an iron ore mine in Tangshan, Hebei, a 350-3G with 8,000 hours of operation completed 35-40 cycles per hour at full load, a performance only about 5% lower than that of a new machine of the same tonnage.

The hydraulic system offers exceptional stability, utilizing Hitachi’s unique HIOS II hydraulic system. Dual-pump merging technology ensures on-demand flow distribution, improving compound action response speed by 15%. Professional testing showed that the main pump pressure of a used 350-3G maintained a standard 34.3MPa, and the hydraulic oil contamination level was within NAS Level 8, ensuring both digging force and operational precision. The head of a municipal engineering company in Jiangsu Province stated that their used 350-3G excavator can avoid 30cm diameter underground pipelines with an accuracy of ±5cm during pipeline excavation, meeting the requirements of precise construction.

Fuel consumption is also impressive. Testing at Hitachi Construction Machinery’s Used Equipment Center revealed that a 350-3G with approximately 10,000 operating hours consumed an average of 18-20 liters of fuel per hour during earthmoving operations, only 1-2 liters higher than a new machine. Based on an annual operating time of 2,000 hours and a diesel price of 8 yuan per liter, the average annual fuel cost is approximately 320,000-360,000 yuan, 8%-12% lower than used equipment of the same class from other brands. This is due to the “economy mode” design, which automatically switches to low engine speed when the operating load drops below 50%, dynamically optimizing fuel consumption.

Quality Assurance: Officially Certified Refurbishment Process

Not all used 350-3Gs receive “official certification.” Hitachi Construction Machinery’s used equipment center has strict entry standards: Equipment must have been in operation for 8,000-15,000 hours, during which mechanical components enter a “stable period” and can operate stably for at least 5,000 hours after servicing. Core components must be original, free of major structural damage, water damage, or fire damage. Complete maintenance records must be provided to ensure traceability.

Equipment that passes the review enters a standardized 45-day refurbishment process. This involves disassembling and cleaning the engine, replacing worn piston rings, valves, and other vulnerable parts, performing cylinder pressure testing, and performing dynamic balancing. For the hydraulic system, all filters and worn hoses are replaced, and the main valve and cylinder are tested for leaks, with seals replaced as necessary. For structural components, worn areas on the bucket and arm are repaired with weld overlays, and critical welds are magnetic particle inspected to ensure crack-free conditions. All refurbished parts are Hitachi originals, ensuring performance compatibility. After servicing, the equipment must undergo a 100-hour “real-world assessment” involving continuous operation in simulated mining, earthmoving, and crushing conditions, monitoring 28 key parameters. Upon meeting all requirements, a “Hitachi Certified Used Equipment Certificate” will be issued. The certificate includes original equipment information, refurbishment details, and test reports, and can be verified on the Hitachi website.

Application Scenarios and Customer Recognition

In mining, the used 350-3G offers robust heavy-duty capabilities. The 1.6m³ standard bucket with reinforced teeth can handle ore with a compressive strength of up to 80MPa. A coal mine in Lüliang, Shanxi, uses two certified used 350-3G machines with breakers to mine raw coal, processing over 2,000 tons per day and achieving an availability rate exceeding 90%. The mine manager stated that the savings of over 1 million yuan compared to buying new machines is enough to cover two years of labor and fuel costs, and the equipment also provides timely after-sales support. Municipal engineering projects require high equipment flexibility, and the 350-3G offers significant advantages. Its 3600mm tail swing radius allows for easy maneuverability in narrow streets, while its boom side-shift function eliminates the need for frequent adjustments when working near walls, improving efficiency. A Hangzhou municipal company is using a used 350-3G to complete underground pipe excavation and concrete crushing tasks during the renovation of an old residential complex. The project manager commented on its flexible steering, precise operation, and quiet operation in residential areas, resulting in no complaints.