Principles to be followed when using gear oil pump

When using gear oil pump, we will encounter many faults, and the causes of these faults are also different. According to the troubleshooting methods of gear oil pump production over the years:
(1) Add or change the required engine oil at the specified oil level in season. Take out the foreign matters in the oil pipe and tighten the bolts or nuts at the joint
(2) Replace the aged or damaged skeleton oil seal or "O" seal rubber ring;
(3) Replace the worn gear oil pump or oil pump shaft sleeve. When the wear is slight, grind the end face flat on the plate. The allowable error of unevenness is 0.03mm; The end face of the upper shaft sleeve is lower than the upper plane of the pump body (the normal value is lower than 2.5 ~ 2.6mm). If it is poor, the lower shaft sleeve shall be added with 0.1 ~ 0.2mm copper sheet to compensate. During installation, it shall be installed on the rear shaft sleeve;
(4) Only when the unloading plate and sealing ring are installed into the oil chamber can the two shaft sleeves maintain balance. The sealing ring of unloading plate shall have 0.5mm preload;
(5) The elastic force of the guide steel wire shall be able to twist the upper and lower shaft sleeves by a small angle towards the rotation direction of the driven gear at the same time, so as to make the processing planes of the two shaft sleeves of the driving and driven gears closely fit;
(6) The unloading groove on the shaft sleeve is installed on one side of the low-pressure cavity to eliminate the harmful dead volume during gear meshing;
(7) Before pressing in the self tightening oil seal, apply a layer of lubricating oil on its surface, and pay attention to the oil blocking edge towards the front cover, which cannot be installed reversely;
(8) The "right-hand" pump cannot be installed on the "left-hand" machine, otherwise the skeleton oil seal will be damaged;
(9) Pour a small amount of engine oil into the pump housing and install it into the pump housing by hand;
(10) Before installing the oil pump cover and tightening the bolts, check whether the distance between the pump cover and the pump body is between 0.3 ~ 0.6mm. If it is too small, replace the sealing ring and pressure relief part. After the hydraulic oil pump is installed, it shall rotate flexibly without jamming.
This is the principle we follow when using gear oil pump.、

What if the shaft sleeve of screw vacuum pump is locked?