HALE AP, Technical Manual

Page: 99 / 177

87
5.8.4.8 CBP Impeller R&R
Prior to performing this procedure, remove the volute as described in paragraph 5.8.4.4, Volute
R&R. (See page 74.)
Typically, the impeller would not require replacement for many years unless it has been damaged
by allowing the pump to freeze with water in it or a large piece of debris was allowed into the
pump by not using or maintaining strainers. Long term wear can damage an impeller to the point
it (and the clearance rings) must be replaced to maintain pump performance specifications. Re-
fer to Table 23 (page 53) for the impeller (and clearance rings) wear specifications. If the impel-
ler requires replacement always inspect (measure) the clearance rings before installing the new
impeller. If the clearance rings are out-of-tolerance they require replacement, see para-
graph 5.8.7.2 on page 110. Figure 31 shows the pump with the volute removed and depicts the
impeller removal.
NOTE
The CBP utilizes a self-locking impeller nut instead of a castle nut and cotter pin.
Figure 32. CBP Impeller R&R