Severe wear and tear of the hydraulic pump of the excavator has a fatal impact on the excavator, so such problems must be solved in time for the excavator. When repairing the hydraulic pump of an excavator, find the cause of the failure from the following three points:
(1) Check the internal leakage of the boom cylinder
The easiest way is to raise the boom to see if there is a clear free fall. If the drop is obvious, disassemble the oil cylinder for inspection, and replace the sealing ring if it is worn.
(2) Check the control valve
First, clean the safety valve and check whether the valve core is worn or not. If it is worn, replace it. If there is no change after the safety valve is installed, check the abrasion of the control valve spool. The use limit of the clearance is generally 0.06MM, and it should be replaced if it is severely worn.
(3) Measure the pressure of the hydraulic pump
If the pressure is low, adjust it. If the pressure still cannot be adjusted, the hydraulic pump is seriously worn.