Impeller Stack Changeout (See Figure 7)
Remove pump from service and mount vertically in
vise (if available) motor side down. Hold at center of
motor. It may be desirable to wrap motor with a shop
rag to protect outside surface.
Proceed as follows:
1. Attach pipe wrench to flats on discharge connection
and turn clockwise to remove (left hand threads).
2. Remove screws holding motor canopy and remove
canopy. Pull straight off as shown. Leave switch
wires attached (if present).
Capacitor voltage may be hazard-
ous. To discharge capacitor, hold insulated handle
screwdriver by the handle and short capacitor term-
inals together. Do not touch metal screwdriver blade
or capacitor terminals.
3. Unscrew capacitor clamp and remove capacitor. Do
not disconnect capacitor wires. Slide 7/16” open end
wrench in behind spring loaded centrifugal switch as
shown. Place on motor shaft flats to hold shaft
stationary.
4. With one 7/16” wrench in place on motor shaft,
place second wrench on shaft hex at pump end and
unscrew impeller stack by turning counter-clockwise.
5. Once loose from motor shaft, hold shaft by snap ring
using a pliers or similar tool, and pull stack from
shell. You may have to apply a back and forth
motion to break stack loose from shell.
To assemble with replacement impeller stack, keep
pump in the vertical position, motor down, and reverse
instructions 1 through 5.
Assembly hints:
A. Apply a soapy water solution to suction and
dischage O-Rings to ease seating of shell.
B. Make sure mechanical shaft seal spring is in
proper position on motor shaft.
C. On three-phase models, apply Loctite No. 271 to
motor shaft threads before reinstalling stack.
7
Disconnect from
power source.
Motor end view with
canopy removed
Motor Canopy
See View A-A
View A-A
Centrifugal
Switch
7/16" Open
End Wrench
Capacitor
Impeller
Stack
Snap
Ring
Remove with
Counter-clockwise
rotation.
1
3
3
4
5
L2
L1
A
B
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7 / 16
A
Discharge
Connection
Remove with
clockwise
rotation.
2
Figure 7 – Impeller stack changeout.
