液压泵常见故障分析与排除方法（Analysis and troubleshooting of common faults in hydraulic pumps）.doc

液压泵常见故障分析与排除方法（Analysis and troubleshooting of common faults in hydraulic pumps） I. Analysis and troubleshooting of common faults in hydraulic pumps Fault phenomenon fault analysis Removal method No oil or oil transportation Not in quantity or in pressure 1 、 the motor does not turn right 2, the oil suction pipe or filter plug 3, axial or radial clearance is too large 4, junction leakage, mixed air 5, too large viscosity of liquid oil or liquid temperature rise too high 1. Check the motor steering 2. Dredge the pipe, clean the filter and change the oil 3. Check replacement parts 4, fastening each connection screw, avoid leakage, prevent air mixing 5, the correct selection of oil temperature control The noise serious pressure fluctuation. 1 、 oil suction pipe and filter blocked or filter capacity is small 2 、 oil suction pipe seal leaks or bubbles in the oil 3 、 the pump is not concentric with the coupling 4 、 low oil level 5 、 low oil temperature or high viscosity 6, pump bearing damage 1. Clean the filter to make the oil suction pipe clear. Choose the filter correctly 2, in the connection parts or seals add oil, such as noise reduction, tighten the connector or replace the sealing ring; oil return should be below the oil level, and the suction pipe to a certain distance 3, adjust concentric 4, refueling fluid 5, the oil is heated to proper temperature 6, check (hand touch) pump bearing, part temperature rise, pump shaft neck oil seal, oil leakage The hydraulic resistance of the pipeline is large, so that the pressure in the pump is raised to the allowable value of the oil seal Check whether the oil drain on the pump body of the plunger pump is connected to the tank directly with a separate oil pipe. If it is found to leak a few parallel piston pump in a same diameter duct and then connect the fuel tank, or the plunger pump drainage pipe received a total oil return pipe, it should be corrected. It is better to attach a pressure gauge at the pump outlet to check the