The self-priming pump integrates self-priming and clog-free sewage discharge. It employs an axial backflow mixing design and, through a unique design of the pump body and impeller flow channel, can transport both clean water and sewage containing particles and fibers, as well as feces. It is widely used in municipal sewage projects, river and pond aquaculture manure treatment, sedimentation of waste mineral impurities, and chemical media in light industry, papermaking, food, chemical, pharmaceutical, power, pulp, and mixture industries. The sewage pump features a strong suction and clog-free structural design.
1. Reassemble the self-priming pump components in sections, following the reverse order of the disassembly steps.
2. Install the stuffing box onto the pump cover, and at the same time, insert the centering block (wedge block) into the stuffing cavity of the stuffing box and between the stuffing sleeve to center the pump shaft.
3. Install the self-priming pump coupling, shaft end adjusting nut, motor bracket, etc. in sequence.
4. Reassemble the assembled motor (except for the oil cooler, which will be installed after the coupling is centered to facilitate adjustment).
5. After the self-priming pump motor is installed, use two dial indicators to check the runout of the motor end coupling plane and circumference. It should be within the standard range. If it does not meet the standard, the thrust head assembly clearance should be adjusted or the thrust head should be corrected according to the actual situation.
6. After verifying that the runout of the motor coupling plane and circumference is within acceptable limits, proceed with aligning the motor shaft and pump shaft. Align the disassembly marks on the motor coupling and pump coupling, and divide the two couplings into eight equal parts along the circumference. Install a dial indicator on both the plane and circumference of the submersible pump coupling. Use a turning device to slowly rotate the rotor in equal divisions to read the rotor runout value and record it. If it does not meet the standard, adjust it by adding or removing shims between the couplings or by slightly moving the motor bracket until it is within acceptable limits.
7. After adjustment, use the locating pin for positioning, and adjust the clearance between the impeller and the impeller chamber to the acceptable range by adjusting the shaft end adjusting nut. Rotate the shaft end adjusting nut until the clearance between the shaft end adjusting nut and the motor coupling is 4mm. Secure the motor coupling, shaft end adjusting nut, and pump coupling with bolts.
8. Remove the centering block from the stuffing box and install the packing and packing gland.
9. Clean the oil chamber and reinstall the oil cooler, cooling water pipe joints, motor end cover, lubricating water pipes, and various measuring points.
