Pump Housing: The pump housing serves as the main body that houses the internal components of the main pump.
It is typically made of high-quality cast iron or steel to ensure durability and withstand high pressure.
Cylinder Block: The cylinder block is an essential part of the main pump. It contains a series of piston bores or cylinders, which reciprocate to generate hydraulic pressure. The cylinder block is precision-machined to ensure smooth movement and optimal sealing.
Pistons: The main pump of the ZX120-6 utilizes multiple pistons within the cylinder block. These pistons move back and forth inside the cylinder bores, creating hydraulic pressure as they do so. They are typically made of hardened steel or other durable materials to withstand high pressure and extended use.
Valve Plate: The valve plate is located between the cylinder block and the swash plate. It contains a series of precisely engineered valve ports and passages that regulate the flow of hydraulic fluid. The valve plate ensures proper distribution of the pressurized fluid to different hydraulic circuits.
Swash Plate: The swash plate is a key component that converts the rotational motion of the pump shaft into reciprocating motion of the pistons. It consists of a tilted circular plate with angled surfaces that push the pistons back and forth within the cylinder block as it rotates. The angle of the swash plate determines the displacement and flow rate of the pump.
Bearings: The main pump incorporates various bearings to support the rotating shafts and minimize friction. These bearings ensure smooth and reliable operation, reducing wear and extending the pump's lifespan. Common types of bearings used include ball bearings, roller bearings, and thrust bearings.
Shaft and Seals: The main pump is driven by a shaft connected to an external power source, such as an engine or an electric motor. The shaft transfers the rotational force to the swash plate, initiating the reciprocating motion of the pistons. Additionally, seals are employed throughout the pump to prevent fluid leakage and maintain hydraulic pressure.
Control Mechanism: The Hitachi ZX120-6 main pump may feature a control mechanism, such as a servo or proportional control system.
This mechanism regulates the swash plate angle or pump displacement, allowing for precise control of the hydraulic flow and pressure according to the machine's requirements.
Filter and Suction Strainer: To ensure the longevity of the main pump and maintain the hydraulic system's cleanliness, a filter and suction strainer are often included. These components remove contaminants and debris from the hydraulic fluid, preventing damage to internal parts and maintaining optimal performance.
Pressure Relief Valve: The main pump is equipped with a pressure relief valve as a safety measure. This valve protects the hydraulic system from excessive pressure by diverting the excess fluid back to the reservoir, preventing potential damage to the pump or other components.