When the pressure of the vane pump of the aluminum profile extrusion machine reaches 100, the noise is particularly loud, and there is almost no noise when the pressure is 70-80. What is the reason?

The pressure of the vane pump of the extruder is generally not greater than 16MPa, and it can be between 10-14 in normal use, depending on where the key is used. As for the vane pump of the aluminum extrusion machine, the noise is particularly loud when the pressure reaches 100, and there is almost no noise at 70-80. This requires checking whether the operation of the lower vane pump is normal when oil is supplied? If it is a pump problem, the maintenance is relatively simple. It only needs professional maintenance personnel to remove the bad oil pump and replace it with a new pump core.