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2. When disassembling the impeller and disassembling the pump impeller, it is necessary to measure the axial movement and radial jump of the rotor, and whether the axial movement and radial jump of the rotor are normal.
3. Disassemble the back cap of the impeller, remove the impeller, confirm the rotation of the back cap before disassembly, and forbid to damage the back cap by reverse force. when the impeller is pried off with a crowbar, it should be pried at the rib plate of the impeller so as not to pry the impeller, and the back cap of the impeller should be free from snap buckle and slippery wire phenomenon in appearance inspection, otherwise it should be repaired or replaced.
4. Remove the impeller guide flat key again, and the flat key appearance inspection key should have no obvious deformation, defect and other defects, and the cooperation with the keyway should meet the requirements, otherwise it should be repaired or replaced.
5. Remove the pump cover and sleeve and loosen the bearing cover to extract the shaft from the suspension (note that impeller nuts should be worn when hitting the shaft head with a copper rod to prevent thread damage).
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