Pomac Pumps PLP - Shaft Seal Assembly; Single Mechanical Seal Assembly, Types M1, M3 and M4; Double Mechanical Seal Assembly, Types M2, M5, M6 and M7; O-Ring Seal Assembly, Types O1 and O2

User manual Pomac PLP Lobe pump
CE/PLP (1406) EN-12 37
7.12. Shaft seal assembly
7.12.1. Single mechanical seal assembly, types M1, M3 and M4
See paragraph 9.5.1 for drawing and part list with item numbers.
1. Fit the seal seat (7F) into the rotor case. The tabs of the bush must fit into the slots of the
seal cover.
2. Fit the wave spring (7E) onto the pump shaft.
3. Fit the stationary seal face (7C) with its O-ring (7D) over the pump shaft into the rotor case.
Ensure that the co-rotation pins fit into the slots of the seal ring!
4. Fit the rotating seal ring (7A) with its O-ring (7B) into the rotor. Ensure that the co-rotation
pins fit into the slots of the seal ring!
5. Fit the rotor, see 7.12.
7.12.2. Double mechanical seal assembly, types M2, M5, M6 and M7
See paragraph 9.5.2 for drawing and part list with item numbers.
1. Fit the rotating seal face (7J) with its O-ring (7K) onto the pump shaft. Ensure that the co-
rotation pins on the shaft fit into the slots of the seal ring!
2. Fit the stationary seal face (7I) with its O-ring (7H) over the pump shaft.
3. Fit the seal seat (7F) with its O-ring (7G) into the pump casing. The tabs of the bush must fit
into the slots of the seal cover.
4. Fit the wave spring (7E) onto the pump shaft.
5. Fit the stationary seal face (7C) with its O-ring (7D) over the pump shaft into the rotor case.
Ensure that the co-rotation pins correspond to the gaps of the seal ring!
6. Fit the rotating seal face (7A) with its O-ring (7B) to the rotor. Ensure that the co-rotation
pins fit into the slots of the seal ring!
7. Fit the rotor, see 7.12.
7.12.3. O-ring seal assembly, types O1 and O2
See paragraphs 9.5.3 and 9.5.4 for drawings and part lists with item numbers.
1. Fit the O-ring(s) (7C) into the seal seat (7F)
2. Fit the seal seat with its O-ring(s) (7G) into the rotor case. The tabs of the bush must fit into
the slots of the seal cover.
3. Fit the shaft sleeve (7A) with its O-ring (7B) into the rotor. Ensure that the co-rotation pins
fit into the slots of the shaft sleeve!
4. Fit the rotor, see 7.12.