Talk about how to deal with the abnormal phenomenon of the hydraulic pump

Electric hydraulic torque wrench hydraulic pump fluids are actually gear pumps, vane pumps, etc. Today, I will introduce to you electric hydraulic torque wrenches. Gear pumps are actually very common failures, and there will be wear between the pump body and gears. , The pump body and cracks are damaged, and the above conditions must be repaired. The following editor will discuss with you how to deal with the abnormal phenomenon of the hydraulic pump.

Possible causes of severe noise and pressure fluctuations and maintenance methods:

Reason 1: The filter of the pump is blocked by dirt and cannot filter oil. Maintenance method: Use clean oil to remove dirt from the filter.

Reason 2: The oil level is insufficient, the oil suction position is too high, and the oil suction pipe is exposed to the oil surface. Maintenance method: add oil to the oil level and lower the oil suction position.

Reason 3: There is no paper pad on both sides of the pump body and the pump cover; the pump body and the pump cover are not sealed vertically. Maintenance method: suck in air when rotating; add a paper pad between the pump body and the pump cover; grind the pump body on a flat plate with emery so that the vertical error of the pump body and the pump cover does not exceed 0.005mm, and tighten the connection between the pump body and the pump cover , There must be no leakage.

Reason 4: The driving shaft of the pump is not concentric with the motor coupling, and there is distortion and friction. Maintenance method: adjust the concentricity of the pump and motor coupling so that the error does not exceed 0.2mm.

Reason 5: The meshing accuracy of the pump gear is not enough: the gear meshing accuracy of the pump gear is reached.

Reason 6: The oil seal skeleton of the pump shaft is off, and the pump body is not sealed. Repair method: replace the qualified pump shaft oil seal.

Possible causes and maintenance methods of abnormal operation or seizure of the hydraulic pump:

Reason 1: The axial clearance and radial clearance of the pump are too small. Maintenance method: If the axial and radial clearances are too small, replace the parts and adjust the axial or radial clearances.

Reason 2: Needle roller rotation is not flexible. Repair method: replace the needle bearing.

Reason 3: The concentricity of the cover plate and the shaft is not good. Repair method: replace the cover plate to make it concentric with the shaft.

Reason 4: The pressure valve is out of order. Maintenance method: check whether the pressure valve spring is out of order, whether the valve body orifice is blocked by dirt, whether the spool valve and the valve body are malfunctioning; replace the spring, remove the dirt on the valve body orifice or replace the spool valve.

Reason 5: The concentricity of the coupling between the pump and the motor is insufficient. Maintenance method: adjust the concentricity of the pump shaft and the motor coupling so that the error does not exceed 0.20mm.

Reason 6: There are impurities in the pump. Maintenance method: iron filings may be left during assembly, or impurities may be inhaled in the oil; use fine copper wire mesh to filter the oil used in the total loss system to remove dirt.