Self-priming centrifugal pump maintenance: a. Rolling bearings: When the pump long-term operation, the bearing wear to a certain extent, to be replaced. b. Front seal ring, rear seal ring: When the seal ring wear to a certain extent, to be replaced. c. mechanical seal: mechanical seal in the case of no leakage, the general should not open and check. If there is any serious leakage at the lower end of the bearing body, the mechanical seal should be disassembled. Assembly and disassembly of mechanical seals, you must gently, pay attention to the cleaning with the surface to protect the static ring and moving the mirror ring is strictly prohibited percussion collision. The main reason for the leakage caused by the mechanical seal is the rubbing of the mirror surface. The repair method, you can pay to rub the friction surface to restore the mirror. Another reason for the leakage of a mechanical seal is that the O-ring seal (or cushion) is improperly installed or deformed. In this case, you need to adjust or replace the "O" ring for reassembly.Remove the centrifugal pump: a.Remove the motor or out of the coupling b.Remove the bearing body assembly, check the impeller and the front port Check the radial clearance of the ring and check for looseness of the impeller nut. C. Remove the impeller nut, pull out the impeller and check the radial clearance of the impeller and the rear seal ring. D. Check the seal of the "O" ring [or cushion] by checking the fit of the moving and stationary ring end faces, e. Unscrew the fastening nut of the coupling and pull out the coupling F. Remove the bearing cover, remove the pump shaft and bearing g. The installation can be done in the reverse order.
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