First, the plunger pump working noise causes and elimination methods

(1) There is air in the oil pump memory. This fault is generally in the installation of a new pump, in the start of a new pump, you should first add oil to the pump, the pump bearings, plunger and cylinder lubrication.

Treatment: open the oil pump refueling port when the pump is running, so that the air inside the pump is discharged from the refueling port.

(2) The oil level of the tank is too low, the suction pipe is clogged, making the pump suction resistance becomes larger resulting in the pump suction or the oil inlet pipe section has a leakage, the pump inhaled air.

Treatment: add enough oil according to regulations; cleaning filter, dredge the intake pipe; check and tighten the connection screws into the oil pipe section.

(3) oil pump and motor installation is not appropriate, that is, the pump shaft and motor shaft concentricity is not consistent, so that the oil pump bearing by radial force noise.

Treatment: check and adjust the concentricity of the oil pump and motor installation.

(4) The viscosity of the hydraulic oil is too large, making the pump self-priming ability to reduce the volumetric efficiency.

Treatment: Select the appropriate viscosity of the hydraulic oil, if the oil temperature is too low should open the heater.

Second, the axial piston pump working pressure gauge needle is not stable reasons and exclusions

(1) oil distribution disk and cylinder or plunger and cylinder wear between the serious, so that the internal and external leakage is too large.

Treatment: check and repair the mating surface of the oil distribution disk and the cylinder; single cylinder research, replace the plunger; tighten the screws at each connection to eliminate leakage.

(2) If it is an axial piston variable pump, it may be due to the variable angle of the variable mechanism is too small, resulting in too small a flow, the relative increase in internal leakage. As a result, the oil can not be continuously supplied and the pressure is unstable.

Treatment: appropriately increase the variable angle of the variable mechanism, and eliminate internal leakage.

(3) oil inlet pipe blockage, oil suction resistance and air leakage may cause pressure gauge needle instability.

Treatment: oil inlet pipe clogging, liquid flow resistance, you can dredge the oil pipeline to wash the inlet filter, check and tighten the oil inlet pipe section of the connecting screws, to exclude air leakage.

Third, the axial piston pump flow causes and elimination of insufficient methods

Manifested in the slow action of the executive element, the pressure does not go.

(1) The oil level of the oil tank is too low, the oil pipe, oil filter clogging or excessive resistance and air leakage.

Treatment: Check the height of the oil tank oil level. Insufficient should be added. Oil pipe, filter clogging should be unclogged and cleaned. Check and tighten the screws at each connection to eliminate air leakage.

(2) the oil pump is not full of oil before running, leaving air.

Treatment: from the oil pump return port filled with oil, remove the air in the oil pump.

(3) oil pump center spring broken, so that the plunger can not return, cylinder and oil distribution plate sealing bad.

Treatment: oil pump center spring elasticity or broken.

(4) Improper connection of the oil pump, so that the pump bearing by axial force, resulting in the cylinder and oil distribution disk gap, high and low oil cavity cascade.

Treatment: change the connection method to eliminate axial force.

(5) If it is variable axial piston pump, the variable angle may be too small.

Treatment: If the variable axial piston pump variable angle is too small, it should be adjusted appropriately.

(6) The hydraulic oil is not clean, the cylinder and oil distribution disk or cylinder and plunger wear, so that too much oil leakage.

Treatment: check the cylinder and oil distribution disk and plunger wear, depending on the situation, repair and replace the plunger.

(7) The oil temperature is too low, the viscosity of the oil decreases, resulting in increased internal leakage of the pump, the pump and accompanied by symptoms of heat.

Treatment: According to the temperature rise of the oil pump, select the appropriate viscosity of the hydraulic oil. Find out the reason why the oil temperature is too high or too low, and exclude in time.

Fourth, axial piston pump oil leakage of serious reasons and exclusion methods

(1) the oil pump combination of poor sealing, such as sealing ring damage.

Treatment: check the oil pump seal at each joint, replace the sealing ring.

(2) oil distribution disk and cylinder or plunger and contract body wear between the body is too large, caused by the return pipe leakage increase, will also be up the oil pump did not low-pressure oil cavity between the internal leakage.

Treatment: grinding oil distribution disk and cylinder contact surface; research with the cylinder and plunger vice.

According to experience, the pump failure is generally due to the system fluid is not clean caused by the pump damage, the pump into the air is also caused by one of the reasons for the reduction of the service life of the pump. To do a good job of maintaining the fluid