SEAL CHANGE INSTRUCTIONS
SP1500UN SERIES
GENERAL
Exercise extreme care in handling and installing the new seal and ceramic seat assembly.
The lapped and polished surfaces may easily be damaged by dirt or scratching.
For safety, all service must be performed with all power shut off.
1.
2.
3.
4.
5.
6.
Remove pump and motor assembly from piping
system by unscrewing union nuts.
Remove pump housing cover by removing the
seven (7) housing bolts and nuts which fasten
housing cover to pump housing. The impeller is
now exposed.
To remove impeller, insert screwdriver in slot at
end of motor.* Hold screwdriver so as to keep
shaft from turning, and rotate the impeller in a
counterclockwise direction. The spring portion of
the seal assembly is now exposed.
Note carefully the position of the spring seal and
pull it off the impeller.
To remove the stationary (ceramic seat) part of the
seal assembly:
a.
Loosen the four (4) motor securing bolts and
disengage the motor from the pump housing.
b.
With motor removed, press the clear plastic
and ceramic seat assembly out of the pump
housing recess. If tight, tap lightly from the
“motor” side.
Clean and lubricate the impeller hub shaft and
pump housing seal recess with a dilute solution of
non-granulated liquid-type soap. Gently wipe the
polished face of the new ceramic seat with a soft,
dry cotton cloth.
7.
8.
9.
10.
11.
12.
Press the new spring portion of the assembly onto
the impeller, black polished surface facing away
from the impeller.
Carefully press ceramic seat, with O-ring, into clear
plastic seat retainer—polished surface facing out.
Be sure O-ring is in place on cut ridge of clear
plastic retainer. Press plastic retainer, with ceramic
seat inside, into recess of pump housing—O-ring
end first. Replace the assembly firmly and evenly.
Carefully insert the motor shaft through the seat
assembly, and secure motor to pump housing with
four (4) motor securing bolts. (Be sure motor base
is positioned properly.)
Screw the impeller, with spring seal, onto the motor
shaft, hand tight, by turning clockwise.
Clean fiber gasket (replace if necessary) and fasten
housing cover to pump housing with seven (7) bolts
and nuts. Tighten bolts and nuts alternately and
evenly.
Reconnect pump to piping system. Be sure to fill
strainer with water before restarting.
*For A.O. Smith Motors: Remove motor end cover and
carefully apply wrench to flat on motor shaft to hold shaft from turning.
ELECTRICAL GUIDE —60 CYCLE MOTORS—SINGLE PHASE
MOTOR
1/2
3/4
1
VOLTS
115
115
115
CIRCUIT BREAKER
RATINGS—AMPS
10
15
20
BRANCH FUSETRON
RATINGS—AMPS
10
15
20
RECOMMENDED
WIRE SIZE
0-50’
No. 14
No. 14
No. 12
A separate electrical circuit, utilizing a rating as above, is recommended.
KW
HP
.37
.55
.75
