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MAINTENANCE
MECHANICAL SEAL REPLACEMENT
This procedure is best completed with the pump held in a
vertical position, motor down.
First complete Disassembly instructions 1 through 5 under
Impeller Stack Replacement. See Figure 8.
1.
Remove four capscrews holding pump body to motor. Pump
handle will come off with top capscrews.
2.
Unscrew pump shell from pump body, turning clockwise
(left hand threads).
3.
Remove mechanical shaft seal spring and rotating half from
motor shaft. Use care not to scratch motor shaft when
removing rotating half.
4.
Remove pump body from motor and place on flat surface,
face down. Again, use care not to scratch motor shaft.
5.
Use a screwdriver to push ceramic seat out from seal cavity
as shown.
6.
Installation of ceramic seat:
A.
Turn pump body over so seal cavity is up; clean cavity
thoroughly.
B.
Clean polished surface of ceramic seat with a
clean cloth.
8
Rotating Half
of Mechanical
Seal
FP327 (01-15-23)
7.
8.
NOTE: Lubricate suction and discharge O-rings with soapy water
for easier installation of shell.
7
Remove shell;
turn clockwise.
10
Push ceramic
seat out of
pump body
9
Remove
Pump Body
11
3/4" pipe or
3/4" socket
with extender
6
Ceramic Seat
Figure 9 – Mechanical Seal Replacement
C.
Lubricate outside rubber surface of seat with soapy
water. Place cardboard washer over polished face of
seat and press into seal cavity using a 3/4" socket or a
piece of 3/4" standard pipe.
D.
Be sure polished surface of seat is free of dirt and has
not been damaged by insertion. Remove excess soapy
water. Dispose of cardboard washer.
Installation of rotating half and spring:
A.
Reinstall pump body on motor using extreme caution
not to hit ceramic portion of seal on motor shaft.
Reattach pump body to motor using capscrews. Be
sure to reinstall pump handle at this time.
B.
Inspect shaft to make sure that it is clean.
C.
Clean face of rotating half of seal with a clean cloth.
D.
Lubricate inside diameter of rotating half with soapy
water and slide onto motor shaft (sealing face first).
E.
Place spring over motor shaft so it rests on rotating
half.
To complete reassembly from this point, reverse
instructions 1 through 5 under Impeller Stack Replacement.
Rotating
Half
12
Cardboard
washer (supplied
w/seal)
Polished
Face
Torque bolts to
15-27 ft-lbs
during
reassembly.
1212 0605
9
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