+8617731766260/18233754501 
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(1) Add or replace engine oil that meets the required brand to the specified oil level according to the season. Take out the foreign objects in the tubing and tighten the bolts or nuts at the joints;
(2) Replace the aging or damaged skeleton oil seal or "O"-shaped sealing rubber ring;
(3) Replace the worn gear pump or oil pump shaft sleeve, and smooth the end surface on the flat 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 upper plane of the pump body (the normal value is lower than 2.5～2.6mm). If the tolerance is out of range, a 0.1～0.2mm copper sheet should be added to the lower shaft sleeve to compensate. Should be installed on the rear shaft sleeve;
(4) The unloading piece and the sealing ring must be installed in the oil inlet cavity so that the two shaft sleeves can maintain balance. The unloading piece sealing ring should have a preload of 0.5mm;
(5) The elastic force of the guide wire should be able to simultaneously twist the upper and lower bushings towards the rotation direction of the driven gear by a slight angle, so that the processing planes of the two bushings of the main and driven gears fit closely;
(6) The unloading groove on the shaft sleeve must be installed on the side of the low pressure chamber to eliminate the harmful closed volume when the gear is engaged;
(7) Before pressing into the self-tightening oil seal, a layer of lubricating oil should be applied to the surface of the self-tightening oil seal, and attention should be paid to turning the oil-blocking edge toward the front cover, and not reverse;
(8) "Right-handed" pumps cannot be installed on "left-handed" machines, otherwise the skeleton oil seal will be damaged;
(9) Before installing the pump cover, pour a small amount of oil into the pump casing and turn the meshing gear by hand;
(10) Before installing the gear pumps cover and not tightening the bolts, check the gap between the pump cover and the pump body to see if it is between 0.3 and 0.6 mm. If the gap is too small, replace the large sealing ring and pressure relief parts. After the hydraulic oil pump is installed, it should rotate flexibly without jamming.
+8617731766260/18233754501
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