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Recently, I’ve been watching “Forensic Examiner Qin Ming” – this real-life figure is portrayed in a dramatic way through television dramas, which not only helps people understand forensic science but also provides valuable insights into medical knowledge. Although some of the graphic scenes are blurred, it’s still clear that forensic experts have a very tough job – they not only have to overcome their own fears but also need to be extremely meticulous. They are the forensic experts of humanity, silent blades that conquer evil. In the pump industry, there are also many technicians like Qin Ming who can enable silent pumps to be \"diagnosed\" and have their problems resolved promptly when failures occur. Drawing on the rich experience accumulated through daily \"diagnostics\" by these experts, I will now share with you the maintenance steps for Hengsheng Pump Industry’s gear pumps. I. Disassembly Adequate preparation should be done before disassembly, including familiarizing oneself with the equipment’s structure, manufacturing process, and operating conditions ； Care should be taken during disassembly to avoid damaging the equipment components. II. Re-inspection of data A comprehensive check should be carried out on the clearance between various components of the gear pump; the standards for some of these clearances are shown in Table 1–1. III. Inspection Conduct a detailed inspection of the removed components; perform a coloring test on the gears, and cracks are not permitted ； The taper of the journal is within acceptable limits; there should be no scratches on its surface, and the maximum allowable value for roughness Ra is 1.6μm ； The end caps, brackets, and pump body must be free of any obvious defects. IV. Repair or Replacement Parts that exceed the specified standards should be replaced, and those that need to be repaired must meet the standards after repair. V. Assembly and Adjustment The axial clearance between the gear end faces and the end covers, as well as that between the brackets, is adjusted by changing the thickness of the sealing gaskets between the end covers, brackets, and the pump body ； When tightening the end cover bolts, apply force symmetrically and evenly, tightening them while rotating the rotor; if the rotor fails to rotate, loosen the bolts and tighten them again ； When adding fillers or oil seals, and when tightening the cover, it is still necessary to turn the rotor while tightening; it should not be tightened too tightly. VI. Testing The hydrostatic test is conducted at 1.5 times the working pressure; no leaks should occur over a period of 5 minutes. During operation testing, there should be no leaks, the operating noise should be normal, no abnormal vibrations should be present, and the outlet pressure must meet the specified requirements to be considered successful. Are you in the pump industry? Come and learn * quickly – you can also become the “Qin Ming, the forensic expert” in the pump industry.