The cause of the failure: the end face of the oil pump or the end faces of the main and driven gear shaft sleeves are worn or scratched,hydraulic pump and the unevenness of the end faces of the two shaft sleeves is out of tolerance. Remedy: replace the worn gear oil pump or oil pump shaft sleeve,hydraulic pump and smooth the end surface on the plate when the wear is slight. The allowable error of its unevenness is 0.03mm; the end face of the upper shaft sleeve is lower than the pump body,hydraulic pump and the upper plane (normal value is lower than 2.5~2.6mm). If it is out of tolerance,hydraulic pump add 0.1~0.2mm copper sheet to the lower shaft sleeve to compensate. It should be installed on the rear shaft sleeve
The cause of the failure: the internal leakage of the oil pump caused by the wrong assembly of the internal parts. Remedy: The unloading piece and the sealing ring must be installed in the oil cavity so that the two shaft sleeves can maintain balance. The elastic force of the guide wire should be able to simultaneously twist the upper and lower bushings towards the driven gear rotation direction by a slight angle, so that the processing planes of the two bushings of the main and driven gears fit closely;hydraulic pump the upper unloading groove of the bushing must be equipped with a low pressure cavity. To eliminate the harmful dead volume generated when the gear meshes; before pressing into the self-tightening oil seal,hydraulic pump the surface should be coated with a layer of lubricating oil,hydraulic pump and also pay attention to the oil blocking edge towards the front cover, not reversed; before installing the pump cover, Pour a small amount of hydraulic oil into the pump casing and turn the meshing gear by hand