Product Description

Sany crane crane original high pressure hydraulic oil pump gear pump CBY2040-21

A220301000288 Suitable for Sany mobile cranes STC250T-STC800T use

Function:

Crane high pressure hydraulic oil pumps mainly have the following roles:

1. **Power conversion and transfer**
- **Torque into pressure**: the engine output of mechanical energy into hydraulic energy, the engine torque into the pressure of the hydraulic system, for the crane lifting, telescoping, luffing and other actions to provide a power source.
- **Energy transfer medium**: as the energy transfer medium in the hydraulic system, the hydraulic oil is delivered to each actuator through pipelines and hydraulic components, so that the actuator can move according to the operator's intention and realize various functions of the crane.

2. **System Pressure Establishment**: **Establishment of High Pressure Environment**.
- **Establishment of high-pressure environment**: In the hydraulic system of the crane, the high-pressure hydraulic oil pump is able to extract the hydraulic oil and deliver it to a higher pressure level, so as to establish the high-pressure environment of the whole hydraulic system, and to meet the demand of the crane for hydraulic pressure under different working conditions.
- **Stabilizing system pressure**: During the working process, it can automatically adjust the output flow and pressure according to the load change of the system to keep the system pressure stable. When the crane lifts heavier objects, the oil pump will increase the output pressure and flow rate accordingly to ensure the lifting capacity of the crane; while in light load or no load condition, the oil pump will reduce the output to avoid the waste of energy and damage of equipment caused by too high system pressure.

3. **Control and Adjustment Function**
- **Direction control**: By cooperating with other hydraulic control valves, such as reversing valves, the high-pressure hydraulic oil pump can control the flow direction of the hydraulic oil, so as to realize the different movement directions of the various parts of the crane. For example, by changing the output direction of the oil pump, the boom of the crane can be extended or retracted, and the hook can be raised or lowered.
- **Speed Adjustment**: The output flow rate of the oil pump can be adjusted according to the operator's operation signal or preset working mode, thus controlling the movement speed of each mechanism of the crane. When fast action is required, the oil pump can provide larger flow rate to make the mechanism move quickly; while when precise positioning or slow operation is required, the oil pump reduces the output flow rate to make the mechanism move slowly and smoothly.

4. **Heat dissipation and lubrication**
- **Heat dissipation function **: In the working process, the hydraulic oil will continuously circulate flow, through the hydraulic oil pump, hydraulic motor, hydraulic valve and other components, take away the heat generated by these components in the work, play the role of heat dissipation, to prevent the hydraulic system due to the high temperature and failures, to extend the service life of the hydraulic components.
- **Lubrication **: Hydraulic oil itself has certain lubricating properties, after the hydraulic oil pump delivery process, will be the hydraulic system of piping, valves, pistons and other components for lubrication, reduce friction and wear between components, reduce system energy consumption and noise, improve the operational efficiency and reliability of the system.

5. **Safety protection function**
- **Overload protection**: when the working load of the crane exceeds the rated value, the pressure in the hydraulic system will rise sharply. At this time, the high-pressure hydraulic oil pump can limit the further increase of system pressure through its own pressure regulation mechanism or with the cooperation of safety valves and other protection devices to avoid damage to the structural components and hydraulic system of the crane due to overload, and play a role in protecting the safety of the crane.
- **Prevention of cavitation phenomenon**: In the operation of the hydraulic system, if there is air dissolved in the fluid or bubbles are generated, it may lead to the occurrence of cavitation phenomenon, affecting the performance and stability of the system. High-pressure hydraulic oil pump can reduce the gas content in the fluid by pressurizing the fluid and circulating it, preventing the occurrence of air pockets and ensuring the normal operation of the hydraulic system.