10
If shaft seal is worn or damaged, repair as follows:
Pump Disassembly/Removing Old Seal
Disconnect power to pump motor.
Be sure
gate valves on suction and return piping are
closed before starting work.
Release all pressure by opening all vents before starting
work.
1. Drain pump by removing drain plugs on bottom of
pump body and trap body.
2.
Be sure
there is no pressure in trap body; remove
cover (unscrew by turning handle ring counterclock-
wise).
3. Remove clamp holding pump halves together. Motor
and seal plate assembly can now be pulled away
from pump body.
4. Remove five screws and washers holding diffuser to
seal plate. Remove diffuser.
5. Remove motor canopy. Being careful not to touch ca-
pacitor terminals, loosen capacitor clamp and move
capacitor to one side.
6. Hold shaft with 7/16" open-end wrench on motor
shaft flats.
7. Unscrew impeller from shaft (turn counterclockwise
when facing it).
NOTICE:
On models with impeller screw: Remove
impeller screw (left hand thread - turn
clockwise
) and
gasket before removing impeller. Inspect gasket for
damage, cracks, etc. Replace if damaged.
8. Pull rotating member of seal off of impeller sleeve;
clean sleeve.
9. Remove four screws holding seal plate to motor.
10. Place seal plate face down on flat surface and tap out
ceramic seat.
11. Clean seal cavity in seal plate and clean motor shaft.
Pump Reassembly/Installing New Seal
1. Ceramic seat must be clean and free of dirt, grease,
dust, etc. Wet outer edge of rubber cup on ceramic
seat with small amount of liquid detergent; press ce-
ramic seat into seal plate firmly and squarely with
finger pressure (Figure 5).
2. If ceramic seat will not locate properly, remove it,
place
face up
on bench and reclean cavity. Ceramic
seat should now locate.
3. If seat still will not locate properly, place a cardboard
washer over the polished face and use a piece of 3/4"
(19mm) standard pipe for pressing purposes.
NOTICE: Be sure
not to scratch or mar polished sur-
face or seal will leak.
4. Remount seal plate on motor. Tighten bolts to 60-80
inch-lbs.
(69-92 kg/cm) torque.
5. Apply a
small
amount of liquid detergent to inside di-
ameter of rotating half of seal.
6. Slide rotating seal member, polished face last, over
impeller sleeve until rubber drive ring hits shoulder.
NOTICE: Be sure
not to nick or scratch polished seal
face; seal will leak if face is damaged.
7. Screw impeller onto shaft (clockwise); this will auto-
matically locate seal in seal plate.
NOTICE:
On models with impeller screw: Install im-
peller gasket and lock screw (left-hand thread - turn
counterclockwise
). Torque lock screw to 50-55 inch-
lbs. (57.6-63 kg/cm).
8. Mount diffuser on seal plate; tighten screws to 10-14
inch-lbs. (11.2-16.1 kg/cm) torque.
9. Assemble motor and seal plate to volute; be sure
clamp is properly seated.
NOTICE:
Clamp knob can be located in any position
around volute; if it is moved after assembly, tighten
knob while tapping around clamp to assist sealing.
Do not move clamp while pump is full of water.
Hazardous pressure. Release all pres-
sure from pump and piping system before working
on pump or attempting to adjust or remove clamp.
Clamp may blow off of pump if adjusted under pres-
sure.
10. Prime pump according to instructions on Page 8.
Figure 5: Press seal into seal plate
