Shaft Seal Replacement - Pentair WATERFALL AF-75 Manual De Instalación / Guía Del Usuario

Pump Disassembly
9. Unscrew the impeller from the motor shaft by twisting the impeller counter-clockwise.
10. Remove the rotating portion of the spring seal by hand.
Note: When placing the rotating seal to the side, ALWAYS place flat side down. The portion of the rotating spring
seal that contacts the white ceramic seal must be kept as free from contaminants (dust, dirt, debris, etc.) as
possible.
11. Use the 9/16 inch wrench to remove the four (4) bolts that hold the motor to the seal plate.

Shaft Seal Replacement

The mechanical seal can be changed without disconnecting piping by removing the band clamp and pulling the motor
with pump bracket diffuser and impeller assembly away from front pump housing body.
The Shaft Seal consists primarily of two parts, a rotating spring seal and a ceramic seal. See Figure 4.
The Waterfall Specialty Pump requires little or no service other than reasonable care, however, a Shaft Seal may
™
occasionally become damaged and must be replaced.
The polished and lapped faces of the seal could be easily damaged if not handled with care.
In mild climate area, when temporary freezing conditions may occur, run your filtering equipment all night to
prevent freezing.
To replace the pump seal:
12. Follow steps 1-11 in the "Pump Disassembly" section.
13. Place the seal plate face down on a flat surface and tap out the old ceramic seal.
14. Lubricate the seal seat with clean water.
15. Press the new ceramic seal into the seal plate with your thumbs and wipe off the white ceramic with a clean cloth.
16. Using a 9/16-inch wrench, remount the seal plate to the motor via the four (4) bolts that hold the motor to the seal
plate.
17. Grease the motor shaft thread and continue with steps 2-10 from the "Pump Reassembly" section to reassemble
the pump.
(continued)
Spring Seal Ceramic Seal
Figure 4
WATERFALL™ Specialty Pump Installation and User's Guide
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