First of all, before repair, the user should be familiar with the structure and working principle of double suction split case pump, consult the pump’s instruction manual and drawings, and avoid blind disassembly. At the same time, during the repair process, the user should make good marks and take more photos to facilitate smooth assembly after troubleshooting.

Maintenance personnel bring response tools, cut off the motor power, check electricity, install grounding wires, check to confirm that the inlet and outlet valves are completely closed, cut off the power supply, and hang maintenance signs.

Drain the water in the pipes and pump casing, disassemble the motor, water pump coupling bolts, center-opening connecting bolts and packing gland bolts, disassemble the left and right bearing end covers and top cover of the water pump, remove the end covers, and ensure that all connecting bolts are removed, lift the casing and rotor.

Next, you can conduct a comprehensive inspection of the double suction split case pump to observe whether there are cracks in the pump casing and base, whether there are impurities, blockages, material residues in the pump body, whether there is severe cavitation, and whether the pump shaft and sleeve should be free of corrosion, cracks and other defects. , the surface of the outer ring should be free of blisters, pores and other defects. If the shaft sleeve is seriously worn, it should be replaced in time.

The surface of the impeller and the inner wall of the flow channel should be kept clean, the inlet and outlet blades should be free of serious corrosion, the rolling bearing should be free of rust spots, corrosion and other defects, the rotation should be smooth and without noise, the bearing box should be clean and free of impurities, the sliding bearing oil ring should be intact without cracks, and the alloy should not be seriously shed. .

After all maintenance is completed, assembly can be carried out in the order of first disassembly and then assembly. During this period, pay attention to protecting the parts and not being bruised. The axial fixation position must be accurate. The impeller of double suction split case pump should be installed in the center position. Do not hit the bearing directly with a hammer when installing it. It must be rotated. It should be flexible and free of jamming. After assembly, perform a turning test and the rotor should be flexible and the axial movement should meet the specified requirements.