5
PUMP SERVICE
This centrifugal pump requires little or no service other
than reasonable care and periodic cleaning. Occasion-
ally, however, a shaft seal may become damaged and
must be replaced. The procedure as outlined below will
enable you to replace the seal.
NOTE: Pumps use mechanical seals with a rubber
seat ring or a sealing O-Ring. THESE SEALS ARE
COMPLETELY INTERCHANGEABLE.
CAUTION: The highly polished and lapped faces of this
seal are easily damaged. Read instructions and handle
the seal with care.
Some models are equipped with an impeller screw,
which has a left hand thread. Before unscrewing the
impeller, remove the impeller screw.
REMOVAL OF OLD SEAL
1. After unscrewing impeller, carefully remove rotating
part of seal by prying up on sealing washer, using
two screwdrivers (see Figure 4A). Use care not to
scratch motor shaft.
2. Remove seal plate from motor and place on flat sur-
face, face down. Use a screwdriver to push ceramic
seat out from seal cavity (see Figure 4B).
INSTALLATION OF FLOATING SEAT (Figure 4C)
1. Clean polished surface of floating seat with clean
cloth.
2. Turn seal plate over so seal cavity is up, clean cavi-
ty thoroughly.
3. Lubricate outside rubber surface of ceramic seat
with soapy water and press firmly into seal cavity
with finger pressure. If seat will not locate properly in
this manner, place cardboard washer over polished
face of seat and press into seal cavity using a 3/4”
socket or 3/4” piece of standard pipe.
4. DISPOSE OF CARDBOARD WASHER. Be sure
polished surface of seat is free of dirt and has not
been damaged by insertion. Remove excess soapy
water.
INSTALLATION OF ROTATING
PART OF SEAL UNIT (Figure 4D)
1. Reinstall seal plate using extreme caution not to hit
ceramic portion of seal on motor shaft.
2. Inspect shaft to make sure that it is clean.
3. Clean face of sealing washer with clean cloth.
4. Lubricate inside diameter and outer face of rubber
drive ring with soapy water and slide assembly on
motor shaft (sealing face first) until rubber drive ring
hits shaft shoulder.
5. Screw impeller on shaft until impeller hub hits shaft
shoulder. This will automatically locate seal in place
and move the sealing washer face up against seat
facing. Reinstall impeller screw (if used).
7. Connect current carrying conductors to terminals in pres-
sure switch. When replacing motor, check wiring diagram
on motor nameplate against diagram above. If they are not
the same, follow the diagram on the motor.
IMPORTANT: PUMP IS SHIPPED FROM FACTORY
WITH MOTOR WIRED FOR 230 VOLTS. IF POWER
SUPPLY IS 115 VOLTS, REMOVE MOTOR CANOPY
AND RECONNECT MOTOR AS SHOWN IN FIGURE 3.
DO NOT TRY TO RUN MOTOR AS RECEIVED ON 115
VOLT CURRENT.
8. Motor has automatic internal thermal overload protection. If
motor has stopped for unknown reasons, thermal overload
may restart it unexpectedly, which could cause injury or
property damage. Disconnect power before servicing
motor.
9. If this procedure or the wiring diagrams are confusing, con-
sult a licensed electrician.
