How to Repair Excavator Hydraulic Pump?

After the hydraulic pump of the excavator is seriously worn, we find the cause of the failure according to the following three points, and improve the system:

(1) Check the internal leakage of the boom cylinder. The easiest way to do this is to raise the boom and see if it has a noticeable free fall. If the drop is obvious, dismantle the oil cylinder for inspection. If the sealing ring is worn, it should be replaced.

(2) Check the control valve. First clean the safety valve, check whether the valve core is worn, if worn, it should be replaced. If there is still no change after the safety valve is installed, check the wear of the control valve spool again.

(3) Measure the pressure of the excavator hydraulic pump. If the pressure is low, adjust it, and the pressure still cannot be adjusted up, indicating that the hydraulic pump is seriously worn.

Improvements and Effects

(l) Improve the hydraulic system design. After many demonstrations, the advanced priority hydraulic valve and load-sensing full-hydraulic steering gear were finally adopted. Dengfeng hydraulic pump maintenance feels that the new system can give priority to allocating flow to it according to the steering requirements, regardless of the size of the load and the speed of the steering wheel, it can ensure sufficient oil supply, and the remaining part can be fully supplied to the working device circuit, thus eliminating the need for the steering circuit to supply power. Too much oil causes power loss, which improves system efficiency and reduces the working pressure of the excavator hydraulic pump.

(2) Optimize the design of the boom cylinder head and hydraulic pump to reduce the working pressure of the system. Through optimized calculation, the boom cylinder adopts standard series 80/4. The displacement of the hydraulic pump is increased from 10ml/r to 14ml/r, and the set pressure of the system is 14MPa, which meets the lifting force and speed requirements of the boom cylinder.

(3) Pay attention to the correct use and maintenance of the loader during use, add or replace hydraulic oil regularly, maintain the cleanliness of the hydraulic oil, and strengthen daily inspection and maintenance.