14
PUMP SERVICE
Removing Old Seal:
1. Disconnect power to pump motor.
2. Close suction and discharge valves.
3. Drain pump; disconnect unions to allow access to pump.
4. Remove six bolts holding front plate to seal plate; remove front plate
5. Remove shaft cover; using screwdriver in slot on motor end of shaft,
hold pump shaft and unscrew impeller from shaft. Rotating half of seal
will come off with impeller.
6. Carefully remove rotating part of seal from impeller sleeve by pulling
and turning on sealing washer and spring (Figure 12). Do not damage
impeller surface where drive ring seats and seals.
7. Carefully remove four motor throughbolts from seal plate (Figure 13);
remove seal plate and use a screwdriver to tap ceramic seat out from
the rear (Figure 14). Do not damage seal cavity in seal plate.
8. Clean cavity from which seal was removed and clean motor shaft.
Installing New Seal:
1. Ceramic seat must be clean and free of dirt, grease, dust, etc. Wet rub-
ber cup gasket of ceramic seat with
small
amount of liquid detergent;
press into cavity firmly and squarely with finger pressure (Figure 15).
2. If ceramic seat will not locate properly, remove it, place
face up
on
bench, and reclean cavity. Ceramic seat should now locate.
3. Seal must be free of dirt, grease, grit, scratches or chips; be sure im-
peller sleeve is clean. Slide seal assembly, rubber drive ring first, onto
impeller sleeve until drive ring bottoms on impeller back shroud.
4. Slip slinger over shaft; remount seal plate. Torque throughbolts to 25
inch-lbs. (129 kg-cm).
5. Screw impeller onto shaft until impeller hub hits shaft shoulder, auto-
matically pulling seal into place (Figure 16). Work slinger over end of
impeller sleeve so it rides on sleeve.
6. Remount front plate; using pattern shown in Figure 17, torque bolts to
30 inch-lbs. (34.5kg-cm).
BE SURE
to start with bolt in 12 o’clock po-
sition as shown.
7. Reconnect unions; tighten
hand tight only.
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
1
4
6
2
5
3
START HERE
Figure 17: Torque Sequence
