Pentair Pool Products Delta D2CX20-21 Installation & Service Manual With Parts List page 11

Fig. 23
Fig. 24
Fig. 25
23833A596
12. Place seal in seal cavity loosely and using
cardboard protector use both thumbs to press
seal into seal plate. The cardboard protector can
be moved about to insure seal is pressed in
evenly. See Figure 21.
13. Wetting finger and touching center of cardboard
protector will allow it to be easily removed.
14. Coat lower rubber shaft boot portion of carbon
half of rotary seal with conservative application
of STP or equivalent lubricant. Next immerse
seal in small container of Transformer Oil (small
baby food jar recommended). See Figure 22.
Firmly press seal on shaft using thumbs.
Observe that carbon seal is firmly in contact
with ceramic portion of seal, and that carbon
portion has not slipped out of its metal holder.
See figure 23. Install spring for lower seal only.
NOTE: Discard spring retaining ring provided
with the seal, as a groove is machined in the
back side of the bronze impeller to locate and
retain this seal spring.
15. Replace impeller and tighten with vise grip
pliers, holding shaft with large flat blade screw-
driver.
16. File off any burrs made on impeller neck with
vise grip pliers. See figure 24.
17. Clean casing thoroughly with wire brush and
wash out with solvent. Be sure the discharge
port and small weep hole in the volute case is
clean and free of any deposits. See Figure 25.
18. Replace volute case being careful to have
gasket in place. Line up with center marks
made before dismantling pump. See Figure 26.
19. Replace grinder ring and impeller as described
under "Replacing Grinder Ring & Grinder Impel-
ler".
20. Air test repaired pump with approximately 6 lbs.
of air pressure using piping with pressure gauge
and air valve stem. Submerse in water and after
evacuating air from volute case observe for
leaks, remove and dry off pump.
21. Refill seal chamber with Transformer Oil. See
Figure 27. Fill until oil is ¾" below top of oil plug
boss. See Figure 28.
22. Clean oil plug with wire brush, reapply Teflon
tape and reinstall oil plug.
23. In rare case when impeller is locked too tight to
remove as described, it may be necessary to lift
off the motor housing so that rotor can be held
while impeller is removed.
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