Pentair MYERS MPB Serie Manual De Instalación Y Funcionamiento página 7

MAINTENANCE
Pump Disassembly
Hazardous voltage. Can shock, burn or
cause death. Disconnect power to pump before
servicing.
Tools required:
1. 7/16" open end wrench (2 required).
2. Flat blade screwdriver with insulated handle.
3. Work bench with vise recommended.
4. Pliers or similar tool.
5. Pipe wrench.
Impeller Stack Replacement (See Figure 8)
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.
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.
Discharge
1
Connection
See View A-A
3
2
Figure 8 – Impeller stack replacement.
Remove with
clockwise
rotation.
Torque discharge
connection to 80 - 100 ft-lbs
at reassembly
7/16" Open
End Wrench
Overload Protector
(Moved for access)
Capacitor
Disconnect from
power source.
A
Motor Canopy
3. Unscrew the overload and move it aside. Do not
disconnect 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.
Remove with
4
Counter-clockwise
rotation.
3
Overload screw
(remove)
Centrifugal
Switch
View A-A
Motor end view with
canopy removed
7
Snap
5
Ring
Impeller
Stack
1211 0605