86
If inspection indicates the pump shaft oil seal requires replacement see 3.
paragraph 5.8.4.13.1, Pump Shaft Oil Seal And O-ring. (See page 102.)
If inspection indicates the mechanical seal requires replacement see 4.
paragraph 5.8.4.9, Mechanical Seal R&R. (See page 90.)
Impeller Installation
A. Remove mechanical seal spring.
B. Install impeller key in pump shaft keyway. (Use small amount of grease to
hold key in place.)
C. Install mechanical seal spring.
A. 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.
B. Carefully slide impeller over pump shaft, aligning key with impeller keyway.
C. Install impeller nut.
If using a torque limiting 1 3/4-in socket and impact driver (set CW): 1.
a) Hold impeller by hand. (Use proper PPE.)
b) Using torque limiting 1 3/4-in socket and impact driver (set CW), tighten castle
nut.
If using a 1 3/4-in torque wrench and strap wrench: 2.
a) Hold impeller with a strap wrench.
b) Using 1 3/4-in torque wrench, torque (turn CW) castle nut to 110 ft-lb (149 Nm).
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. LOOSENING THE CASTLE NUT MAY RESULT IN EQUIPMENT DAM-
AGE.
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 RESULTING IN EQUIPMENT DAMAGE.
D. Install new cotter pin to lock impeller 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 cold cut chisel and hammer, cut cotter pin flush at mating point of 3.
castle nut and pump shaft.
Ensure cut away excess cotter pin is removed from the pump. 4.
After performing this procedure, install the volute as described in the AP Volute Installation por-
tion of paragraph 5.8.4.3, Volute R&R, on page 72.
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