6
Seal Plate
Mechanical seal
rotating half
Mechanical seal
stationary half
A-Seal removal-rotating half B-Seal removal-stationary half C-Stationary half installation D-Rotating half installation
T
u
r
n
o
v
e
r
Polished
surface
Rubber
surface
Cardboard
washer
(supplied w/seal)
3/4" socket
or pipe
Sealing
face
Rubber drive
ring
Impeller
Shaft
shoulder
5939 0109
FIGURE 4
PUMP SERVICE
This centrifugal pump requires little or no service
other than reasonable care and periodic cleaning.
Occasionally, however, a shaft seal may become
damaged and must be replaced. The procedure as
outlined below will enable you to replace the seal.
NOTICE: These mechanical seals are supplied with
either a rubber seat ring or a sealing O-Ring. They are
completely interchangeable.
NOTICE: 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 (Key No. 5, Page 6),
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 (Key No. 3) from motor and
place on flat surface, 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 (ceramic) seat
with clean cloth.
2. Turn seal plate over so seal cavity is up; clean
cavity thoroughly.
3. Lubricate outside rubber surface or O-ring 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 (see Figure 4D) 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 the
facing seat. Reinstall impeller screw (if used).
SERVICE
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