73
Perform the following to remove and replace the volute.
NOTES
Remove any suction tube and/or piping blocking access to the pump per
OEM/equipment manufacturer instructions.
Remove any discharge piping blocking access to the pump per OEM/equipment
manufacturer instructions.
AP/MBP Volute Removal
A. If pump is still in apparatus, match mark/note/tag and then disconnect suc-
tion, discharge, and cooling lines.
B. If pump is still in apparatus, tag and disconnect any electrical wiring.
C. Match mark volute and pump head to ensure proper alignment during reas-
sembly.
D. If pump is still in apparatus, disconnect ONLY mounting bracket(s) required
for volute removal.
E. Remove twelve (12) 7/16 — 14 X 1.25–in bolts that hold volute to pump
head.
Using 5/8-in wrench (or ratchet wrench or pass thru ratchet [set CCW]), 1.
loosen twelve (12) 7/16 — 14 X 1.25–in bolts.
Remove twelve (12) 7/16 — 14 X 1.25–in bolts. 2.
NOTE
Do NOT damage brass clearance rings or impeller during volute removal.
F. Remove volute from pump head.
G. Remove O-ring from pump head.
H. Remove all remaining gasket material from mating surfaces of volute and
pump head.
Measure clearance rings and impeller hub, replace if out-of-tolerance (see Table 23). If the
clearance rings have failed, perform Clearance Ring R&R (see paragraph 5.8.7.2 on page 110).
If the impeller has failed, perform Impeller R&R (see paragraph 5.8.4.7 on page 83). If the me-
chanical seal has failed, perform Mechanical Seal R&R (see paragraph 5.8.4.9 on page 90).
AP/MBP Volute Installation
A. Prepare volute for installation.
Install new O-ring. 1.
a) Lubricate O-ring. Refer to Table 20.
b) Install new O-ring on pump head into O-ring groove on pump side.
Install new gasket. (Align new gasket with pump head screw holes.) 2.
B. Using care NOT to damage clearance rings or impeller, install volute onto
pump head.
C. Install volute fasteners.
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