HALE AP, Technical Manual

Page: 93 / 177

81
DO NOT INSTALL A USED COTTER PIN. A USED PIN MAY FAIL RESULTING IN DEBRIS
GOING THRU THE PUMP AND/OR LOOSENING OF THE CASTLE NUT THAT SECURES
THE IMPELLER.
DO NOT LOOSEN THE CASTLE NUT TO INSTALL THE COTTER PIN. CONTINUE TO
TIGHTEN THE CASTLE NUT UNTIL THE COTTER PIN CAN BE PUSHED THRU THE HOLE
IN PUMP SHAFT.
D. Install new cotter pin to lock inducer nut in place.
Insert new cotter pin until head of pin seats inside castle nut groove. 1.
Bend cotter pin 90° toward pump shaft. (Bend both halves toward shaft.) 2.
Using a cold cut chisel and hammer, cut cotter pin flush at mating point 3.
of castle nut and pump shaft.
Ensure cut away excess cotter pin is removed from the pump. 4.
If the pump is a RSD, after performing this procedure, install the RSD suction head (see para-
graph 5.8.4.1, RSD Suction Head R&R) or the RSD volute (see paragraph 5.8.4.2 on page 69).
If the pump is an MBP, after performing this procedure, install the volute as described in para-
graph 5.8.4.3, AP/MBP Volute R&R.
5.8.4.6
MBP/RSD Impeller R&R
Prior to performing this procedure, remove the volute as described in paragraph 5.8.4.3, Volute
R&R for an MBP pump or paragraph 5.8.4.2, RSD Volute R&R, for a RSD pump. Then remove the
inducer as described in paragraph 5.8.4.6, Inducer R&R. Figure 29 shows the pump with the
volute and inducer removed and depicts the impeller removal.
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 for the MBP/RSD impeller wear specifications. If the impeller requires replace-
ment always inspect (measure) the clearance rings before installing the new impeller. If the
clearance rings are out-of-tolerance they require replacement, see paragraph 5.8.7.2 (page 110)
for the MBP or RSD.