Instructions / Assembly

Maintenance 9
For parts or assistance, call Flotec Customer Service at 800-365-6832
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.
6. Remove four capscrews holding pump body
to motor. Pump handle will come off with top
capscrews.
7. Unscrew pump shell from pump body, turning
clockwise (left hand threads).
8. Remove mechanical shaft seal spring and rotating
half from motor shaft. Use care not to scratch motor
shaft when removing rotating half.
9. Remove pump body from motor and place on flat
surface, face down. Again, use care not to scratch
motor shaft.
10. Use a screwdriver to push ceramic seat out from seal
cavity as shown.
11. 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.
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.
12. 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.
13. To complete reassembly from this point, reverse
instructions 1 through 5 under Impeller Stack
Replacement.
NOTICE Lubricate suction and discharge O-rings with
soapy water for easier installation of shell.
Ceramic Seat
3/4" pipe or
3/4" socket
with extender
Polished
Face
Rotating
Half
Cardboard
washer (supplied
w/seal)
Rotating Half
of Mechanical
Seal
Remove shell;
turn clockwise.
Push ceramic
seat out of
pump body
Remove
Pump Body
6
8
7
9
10
11
12
1212 0605
Torque bolts to
15-27 ft-lbs
during
reassembly.
Figure 9 – Mechanical seal replacement.