For the maintenance of multistage pump, if conditions permit, first look at the manufacturer's maintenance manual and general assembly drawing to see what special areas need attention. I During disassembly: 1. Before removing the thrust bearing, use a dial indicator to measure the clearance of the balance disc and make records; 2. When disassembling the multi-stage pump, all parts must be marked according to the original matching sequence to avoid confusion and wrong installation during reassembly; 3. Small parts (such as keys) that are not easy to mark can be placed together with impellers or guide vanes (middle section) at the same level. 4. During disassembly, you can intuitively feel whether there are abnormal parts, such as loose fitting, etc. II Parts maintenance: 1. Visually check whether the surface of all parts is normal, and all mating surfaces must be free of collision, scratch, corrosion, etc; 2. Measure whether the tolerance of key mating parts is qual
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