Figure 4-7. Replacing Impeller, Shaft Seal, and Shaft Adapter
When replacing seal, also replace volute O-ring (refer to item 2,
Figure 4-6), wear plate O-ring (8, Figure 4-7), and four self-sealing
Install stationary rubber seat (9A) into pump casing cavity.
Install new shaft seal (9) onto shaft adapter (12).
If a new impeller and/or wear plate is installed or if the impeller clearance is to be changed, determine
the shim thickness required to obtain a clearance of 0.010 to 0.015 inch (0.254 to 0.381 mm) by the
(1) Screw impeller (3) dockwise onto shaft adapter (12) without shims (4 and 5). Be sure that the impeller
is seated firmly against the shaft shoulder. Secure the impeller with teflon washer (2) and hex bolt (1).