HALE AP, Technical Manual

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83
B. If impeller can NOT be removed by hand, use wedges and puller to pull impel-
ler. Loosen impeller as follows:
Install puller (See APPENDIX B, Test Equipment And Special Tool Infor- 1.
mation) on impeller.
Place 1/2-in (M12) flanged nut (flange toward pump shaft) between 2.
pump shaft and puller drive screw (protects shaft threads).
Using a wrench (or socket and ratchet), tighten puller drive screw until 3.
impeller comes loose.
Remove 1/2-in (M12) flanged nut and puller. 4.
Then pull impeller off pump shaft by hand. 5.
C. Remove impeller/pump shaft key.
The pump shaft keyways and the impeller and inducer keys should be inspected whenever parts
are disassembled. Look for signs of excessive and irregular wear. Replace the shaft and/or key if
inspection indicates rounding, excessive wear, or damage.
MBP/RSD Impeller Installation
A. Remove mechanical seal spring.
A. Install impeller key in pump shaft keyway. (Use small amount of grease to
hold key in place.)
B. Install mechanical seal spring.
C. Apply a heavy coating of grease to impeller ends.
NOTE
The grease protects the clearance ring during the initial pump priming to prevent the
ring from contacting the impeller.
D. Carefully slide impeller over pump shaft, aligning key with impeller keyway.
After performing this procedure, install the inducer by performing the Inducer Installation portion
of Inducer R&R procedure (see paragraph 5.8.4.5 on page 76). Then install the volute as de-
scribed in Volute R&R (see paragraph 5.8.4.3 on page 72) or suction head R&R (see para-
graph 5.8.4.1 on page 67). If the RSD volute was removed, perform the Installation portion of the
Volute R&R procedure. (See paragraph 5.8.4.2 on page 69.)
5.8.4.7
AP Impeller R&R
Prior to performing this procedure, remove the volute as described in paragraph 5.8.4.3, Volute
R&R. (See page 72.)
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 AP impeller wear specifications. If the impeller requires replacement al-
ways 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 on page 110.
Figure 30 shows the pump with the volute removed and depicts the impeller removal.