IMPORTANT:
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 seal plate face down on flat
surface and tap out stationary half
of seal.
IMPORTANT:
Be sure you tap on the
ceramic seat, not on copper heat sink.
Do not disturb heat sink (Key No. 4,
Figure 15).
INSTALLING NEW SEAL
1. Clean seal cavity in copper heat
sink. Do not disturb heat sink. (If
heat sink is moved or dislodged,
see instructions for “Copper Heat
Sink Installation”.
2. Wet outer edge of O-Ring on
ceramic seat with liquid soap. Be
sparing!
3. Put clean cardboard washer on seal
face. Polished face of ceramic seat
should be up. With thumb pressure,
press ceramic seal half firmly and
squarely into seal cavity in copper
heat sink (See Figure 7). 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.
IMPORTANT:
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 seal plate to motor
flange. BE SURE it is right side up:
index pins should be down; seal
plate is marked at top (See Figures
8 and 9).
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.
IMPORTANT:
Be sure not to nick or
scratch carbon face of seal when pass-
ing it over threaded shaft end and shaft
shoulder (See Figure 10). The carbon
surface must remain clean or short seal
life will result.
10. Hold motor shaft with 7/16" open
end wrench on shaft flats and screw
impeller onto shaft. Be sure you do
not touch capacitor terminals with
body or any metal object. Tightening
impeller will automatically locate
seal in correct position.
11. Remount diffuser on seal plate. BE
SURE diffuser is right side up as fol-
lows (Figure 11).
a. Rib next to priming hole should be
at six o’clock position;
b. Part number (N1-28P) should be
between nine o’clock and ten
o’clock;
c. Both mounting screws must
engage screw holes in seal plate
(Figure 11).
d. BE SURE rubber pad (See Figure
11) stays in place on top of dif-
fuser.
12. Follow instructions under “Pump
Reassembly”.
IMPORTANT:
If the copper heat sink
moves or shifts during seal removal, it
should be removed and reinstalled.
NOTE:
First, follow instructions under
“Pump Disassembly”.
(
continued)
REMOVING OLD SEAL (continued)
506 0194
Figure 7
Figure 8
Top of motor flange
Seal plate index pins slide in here
Figure 9
Motor flange
Seal plate
Index pins
Ceramic
Face
Carbon
Face
Be Careful
That Motor
Shaft Shoulder...
...Does Not
Damage Seal Face
Figure 10
Figure 11
Seal plate
Diffuser
Priming hole
Rib at 6 o’clock
Be sure nibs
engage notches
Molded
part no. at 9:30
o’clock
Be sure rubber pad
stays in place on
top of diffuser
Be sure screw
engages hole in
seal plate
Be sure screw
engages hole in
seal plate
2
