How to maintain and disassemble the self-priming pump？

Self-priming pump maintenance and disassembly

The pump is characterized by simple and reliable structure and durability. Under normal conditions of the pump, it is generally not necessary to disassemble and maintain frequently. Exclusion can be given at any time after a fault is discovered.

1. Pay attention to several main parts when maintaining the pump:

A. Rolling bearing: When the bearing wears to a certain extent after long-term operation, it must be replaced.

B. Front seal ring and rear seal ring: When the seal ring is worn to a certain extent, it must be replaced.

C. Mechanical seal: The mechanical seal should not be opened and tested without leakage. If there is a serious leak at the lower end of the bearing body, the mechanical seal should be disassembled. When assembling and disassembling the mechanical seal, it must be taken lightly, pay attention to the cleaning of the mating surface, protect the mirror surface of the static ring and the moving ring, and it is strictly forbidden to strike. The reason for the leakage due to the mechanical seal is mainly due to the friction of the mirror surface. The repair method: the end surface of the friction pair can be ground to restore the mirror surface. Another cause of mechanical seal leakage is the improper installation of the O-ring or the aging of the O-ring. At this point, the O-ring needs to be replaced for reassembly.

2. Pump disassembly sequence:

A. Remove the motor or take off the coupling.

B. Remove the bearing body assembly, check the radial clearance between the impeller and the front ring, and check the impeller nut for looseness.

C. Remove the impeller nut, pull the impeller, and check the radial clearance between the impeller and the rear seal ring.

D. Loosen the set screw of the mechanical seal, pull out the moving ring part of the mechanical seal, check the fit of the end face of the moving and static ring, and check the sealing condition of the O-ring.

E. Unscrew the set screw of the coupling and pull out the coupling.

F. Remove the bearing end cover and remove the pump shaft and bearing.

G. It can be assembled in reverse order during installation.