Excavator hydraulic pump sound is a kind of common hydraulic system failure, affects the working efficiency of the drivers, if not timely find the reason, is likely to cause permanent damage of main pump.
Step by step, we take a look at how to screen the main pump failure.
First check the hydraulic oil level is in line with the standard;
Then ruled out big pump and pilot pump with and without mechanical damage: can monitor main pump on auscultation sticks and pilot pump with or without mechanical metal tapping and friction, or remove the hydraulic oil filter;
Oil suction filter;
And the guide filter;
Check whether gold attribute material, depending on the material and the size of the shape of the metal to determine the cause of the problem.
In ruled out because of the large pump mechanical damage caused by the sound, the big priority for air into the pump suction line.
Under the premise that eliminate these above fault condition to check for the lack of feed pump.
Finally I screening the whole hydraulic oil return system to see if there is congestion or pressure is too high now.