Gear pumps are rotary pumps that rely on the change and movement of the working volume formed between the pump cylinder and the meshing gear to transport liquid or increase its pressure. It consists of two gears, pump body and front and rear covers to form two closed spaces, when the gear rotates, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum, sucking the liquid in, and the volume of the space on the gear meshing side changes from large to small, and the liquid is squeezed into the pipeline. The suction chamber and discharge chamber are separated by the meshing lines of the two gears. The pressure at the discharge outlet of a gear pump depends entirely on the resistance at the source of the pump.
Severe wear of the hydraulic pump of the excavator has a fatal effect on the excavator, so such problems must be solved in time for the excavator. When repairing the hydraulic pump of the excavator, find the cause of the fault from the following three points: