If the pressure of the excavator boom is low, check the internal leakage of the working pump

If the fault diagnosis is in the working unit hydraulic system and the boom and swing are not working properly. There are many reasons for this failure. In addition to the boom spool valve leakage and other fault causes, the main safety valve, hydraulic pump, oil filter, hydraulic oil and distribution valve inlet and return oil circuit faults may all cause this fault phenomenon. If the system pressure is low, it may be caused by internal leakage. The following will explain how to check the leakage in the working pump. The inspection methods are different due to different models. This article is for reference only.
The internal leakage of working pump includes high noise during operation. The higher the engine speed, the greater the noise. A large amount of copper chips can be seen in the oil filter. The working pump shall be disassembled for inspection. If damaged, repair or replace it.