5
PUMP SERVICE
This centrifugal pump requires little or no service other than rea-
sonable 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 clean cloth.
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.
INSTALLATION 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 onto shaft until impeller hub hits shaft shoul-
der. 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
ceramic seat
A
-Seal removal-rotating half
B
-Seal removal-ceramic seat
C
-
Ceramic seat installation
D
-
Rotating half installation
Tur
n ov
e
r
Polished
surface
Rubber
surface
Cardboard
washer
(supplied w/seal)
3/4" socket
or pipe
Rubber drive
ring
Sealing
Face
Impeller
3344 1198
Shaft
shoulder
Figure 5: Seal replacement
SERVICE
L2
Blue
Black Tracer
Red
Purple
Black
White
L1
L2
Blue
Black Tracer
Red
Purple
Black
White
L1
Low Voltage
115/230V Dual Voltage
230V Single Voltage
High Voltage
L2
Blue
White
L1
Figure 6: Wiring connection diagram for 115/230V Dual Voltage and 230V Single Voltage TEFC motors. If motor
nameplate diagram does not match this, follow the nameplate diagram.
