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Maintenance (Continued)
Figure 23mRemove Seal Plate
Figure 25--Press In New Seal
REMOVING OLD SEAL
1. Follow instructions under "Pump Disassembly".
2. Follow steps 2 through 5 under "Cleaning/
Replacing Impeller".
3. Unscrew four nuts holding pump back half to motor.
Remove rotating half of seal by placing two screw-
drivers under back half of pump body and carefully
prying up (Figure 23). Back half of pump body will
slide off shaft, bringing seal with it.
NOTICE: Be sure you do not scratch or mar shaft; if
shaft is marred, it must be dressed smooth with fine
emery or crocus cloth before installing new seal. DO
NOT reduce shaft diameter!
4. Place pump body half facedown on flat surface and
tap out stationary half of seal (see Figure 24).
NOTICE: Be sure you tap on ceramic seat, not on
copper heat sink. Do not disturb heat sink (Key No. 6,
Page 12).
INSTALLING NEW SEAL
1. Clean sea! cavity in copper heat sink. Do not disturb
heat sink. (If heat sink is moved or dislodged, see
instructions for "Installing Copper Heat Sink", Page
10).
2. Wet outer edge of Rubber Cup on ceramic seat with
liquid soap. Be sparing!
Figure 24--Tap Out Seal
BE CAREFUL THAT
SHAFT SHOULDER
CERAMIC
FACE
DOES NOT DAMAGE
SEAL FACE
CARBON
FACE
Figure 26--Protect Seal Faces
3. Put clean cardboard washer on seal face. With
thumb pressure, press ceramic sea! half firmly and
squarely into seal cavity in copper heat sink (See
Figure 25). Polished face of ceramic seat is up. If
seal will not seat correctly, remove, placing seal
face up on bench. Reclean cavity, seal should now
seat correctly.
4. If seal does not seat correctly after recleaning
cavity, place a cardboard washer over polished
seal face and carefully press into place using a
piece of standard 3/4" pipe as a press.
NOTICE: Be sure you do not scratch seal face.
5. Dispose of cardboard washer and recheck seal
face to be sure it is free of dirt, foreign particles,
scratches and grease.
6. Inspect shaft to be sure it is free of nicks and
scratches.
7. Reassemble pump body half to motor flange. BE
SURE it is right side up.
8. Apply liquid soap sparingly (one drop is sufficient)
to inside diameter of rotating seal member.
9. Slide rotating seal member (carbon face first) onto
shaft until rubber drive ring hits shaft shoulder.
NOTICE: Be sure not to nick or scratch carbon face of
seal when passing it over threaded shaft end or shaft
shoulder. The carbon surface must remain clean or
short seal life will result.
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