Excavator loader construction machinery parts unloading valve 723-40-56302

Common faults of excavator solenoid valve

When the reversing slide valve of the operating crane is in the middle position, the variable amplitude cylinder sinks

Check whether the cylinder, balance valve and other components and pipe joints in the variable amplitude hydraulic system leak oil; When it is found that there is oil leakage in the cylinder, balance valve and other components and pipe joints in the variable amplitude hydraulic system, it should be eliminated in time. When it is found that there is no oil leakage in the cylinder, balance valve and other components and pipe joints in the variable amplitude hydraulic system, loosen the tubing joint in the upper cavity of the variable amplitude cylinder to see if there is continuous oil flow phenomenon, if it is found that there is continuous oil flow out, it means that the seal in the cylinder is damaged, so that the oil circuit in the upper and lower cavity is connected, then the cylinder seal must be replaced. If there is no continuous oil flow after loosening the bolt, and the boom still drops, it indicates that there is a problem in the balance valve. If there are foreign bodies or grooves on the touch surface of the valve spool and the valve body in the balance valve, the spring in the balance valve is broken or stuck, or the seals in the balance valve are damaged, it is necessary to disintegrate, clean, repair, grind the contact surface of the valve spool and the valve body, view, replace the spring, replace the seals, etc