Pentair Myers MSP40 Installation And Service Manual page 6

Pump
Servicing
10. Remove rotor and shaft.
Tap the rotor shaft (5) at the
impeller end of the shaft with
a plastic mallet to remove the
rotor and shaft. Inspect the
bearings. If they do not rotate
freely and smoothly, they
should be replaced.
11. Remove seal. Remove the
old stationary portion of the
seal (7) from the seal plate by
inserting a screwdriver into the
seal housing of the seal plate
from the top of the case and
tapping lightly with a hammer.
Clean the seal area of the seal
plate (8) with a clean cloth.
12. Reinstall the rotor and shaft
assembly. Push on outer face
to seat bearing in seal plate.
13. Reinstall
seal.
good lubricant to the new
stationary portion
seal (7) and press into the
seal plate. Coat the new
rotating portion of seal with
lubricant and press
place on the rotor shaft with
the rubber ring
the impeller.
14. Reinstall impeller. Add a
drop of Locktite 222 to the
shaft and screw the impeller on
hand tight. The impeller will
force the rotating portion of
seal into position.
6
15. Replace seal ring. Remove the
old square seal ring from the
seal plate and stretch on a new
ring coated with O-ring lube.
Do not roll the ring onto
the seal plate or improper
seating and water leakage into
the motor housing will result.
16. Reinstall the stator. Place the
stator (4) in the seal plate (8)
so the stator bolt holes line
up. Lay the stator plate on
the stator (4) and line up with
stator bolt holes. Put in the
stator bolts and tighten evenly
to prevent cocking of the
stator. Connect the capacitor
to the capacitor leads. Push the
connectors of the two black
stator leads onto the power
cord spade terminals.
17. Reassemble pump. Replace the
motor cover (3) on the seal
plate (8). Place the assembly
on the volute (9). Insert the
four cap screws (6) through
Apply a
the motor housing ears, into
the tapped holes in the volute.
of the
Tighten them evenly to prevent
cocking the motor housing and
causing an uneven seal on the
seal ring.
into
18. Oil. Fill the motor cap with
facing
high grade transformer oil just
covering over stator end cap
(.45 gallon).
Do not fill the motor housing
completely – allow airspace
for oil expansion. Make sure
the stator and capacitor are
fully immersed. You will have
to peer through the oil plug
hole to be sure of the correct
oil level.
19. Reinstall oil pipe plug. Coat
pipe threads with
sealant before installing. Plug
into housing (3).
20. Check pump. Plug the power
cord into a grounded outlet
and start pump by applying
pressure to the
diaphragm (automatic only
– manual should start when
power is applied). Motor
should run smoothly, be free
of vibration and stop when
pressure is removed from
diaphragm switch.
21. Check for air lock.
pumps have a small air vent
hole in the impeller cavity
to let out trapped air. If this
hole becomes plugged, pump
may air lock. To break the air
lock, use a small screwdriver
to clear hole
impeller cavity.
As a secondary precaution in
installations of this type —
1⁄16" hole should be drilled
in the discharge pipe below
the check valve. The check
valve should be 12 to 18 inches
above pump discharge. Do not
put check valve directly into
pump discharge opening.
NOTE: In sumps where the
pump is operating daily, air
locking rarely occurs.
thread
switch
Myers
in the