The hydraulic main pump used in the Hitachi ZX140W-3, ZX170W-3, and ZX210W-3 models is a variable displacement axial piston pump.
It is designed to provide the necessary hydraulic power required for the machine's operation, including the movement of the boom, arm, bucket, and other hydraulic functions.
The pump operates using a hydraulic system that utilizes oil flow and pressure to transfer power to different hydraulic actuators. It converts mechanical energy from the engine into hydraulic energy, enabling the excavator to perform various tasks efficiently.
The main pump has a variable displacement feature, which means it can adjust the oil flow according to the specific requirements of the operation. This allows for precise control of the machine's movements, enhancing productivity and accuracy during excavation or material handling tasks.
The hydraulic main pump has a maximum pressure rating of around 35 MPa (mega pascals). This high-pressure capability ensures that the excavator can generate sufficient force for heavy-duty digging and lifting operations. The pump's pressure rating also contributes to its ability to handle tough working conditions and challenging terrains.
In terms of flow capacity, the hydraulic main pump delivers a variable oil flow rate depending on the operation's demands.
It can provide a maximum flow rate of approximately 240 liters per minute (l/min) in the ZX140W-3 model, 300 l/min in the ZX170W-3, and 380 l/min in the ZX210W-3. The varying flow rates cater to different applications and enable the machine to adapt to the workload efficiently.
To ensure reliability and durability, the hydraulic main pump is constructed with high-quality materials and undergoes rigorous testing during the manufacturing process. The pump features robust internal components, such as precision-machined pistons, cylinder blocks, and valve plates, designed to withstand high-pressure conditions and continuous use.
Additionally, the pump incorporates advanced hydraulic technologies and innovations, including optimized oil flow paths, efficient filtration systems, and noise reduction measures. These features contribute to smoother operation, reduced energy consumption, improved fuel efficiency, and minimized noise levels during machine operation.
Maintenance of the hydraulic main pump is crucial for its longevity and performance. Regular inspections, proper lubrication, and adherence to recommended service intervals are necessary to keep the pump in optimal condition. Hitachi provides detailed maintenance guidelines and support to ensure the longevity of their hydraulic systems.