6
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: Pumps use mechanical seals with a rubber
seat ring or a sealing O-Ring. These seals 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, carefully remove rotating
part of seal by prying up on sealing washer, using
two screwdrivers (see Figure 5A). Use care not to
scratch motor shaft.
2. Remove seal plate from motor and place on flat
surface, face down. Use a screwdriver to push
ceramic seat out from seal cavity (see Figure 5B).
Installation of Floating Seat (Figure 5C)
1. Clean polished surface of floating seat with
cleancloth.
2. Turn seal plate over so seal cavity is up, clean cavity
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.
In stallation of Rotating Part of Seal
Unit
(Figure 5D)
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).
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
Figure 5
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