Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 46)

tighten the shaft sleeve nuts. Then drill a
3/16" diameter shallow recess in the shaft
through the set screw hole in each of the
shaft sleeve nuts. Lock each shaft sleeve
nut in position with set screws (3-902-3). A
low strength sealant, such as Loctite 271,
can be used to retain set screws (See
Figure 45).
FIGURE 45 – DRILLING SET SCREW RECESS
8. Lubricate and roll an O-ring (3-914-2) into
the groove in each casing ring (3-003-9)
and slide the casing rings over the
impeller.
NOTE: 10x8x20 and 12x10x18 utilize
“Floating” Casing Ring Design. Each ring
requires 2 O-rings (See Figure 21B).
9. Thoroughly clean the stuffing boxes (3-
073-9) to prevent dirt from entering the
seal during startup.
10. Press the stationary seats (0-400-0) of the
mechanical seals into both stuffing boxes
with the lapped surface facing the
impeller. Lightly lubricate the stuffing box
bore to ease assembly.
11. Press a new lip seal (3-177-9) into each
stuffing box. Before installing the lip seal,
lubricate the seal lip with a lightweight oil.
NOTE: Lip seals should seat against
machined shoulder in bracket.
NOTE: Seal lip should point away from the
bearings (3-026-3 and -4), if the bearings are
grease lubricated, and towards the bearings,
if the bearings are oil lubricated.
FIGURE 46 – INSTALLING LIP SEAL
12. Lubricate and roll O-ring (3-914-1) into the
groove in each stuffing box.
13. Obtain the set collar (3-421-9) locating
dimension from the table on Figure 37 and
scribe the dimension on the shaft sleeve.
Install set collar on sleeve per this
dimension. (Reference dimensions “A”
and “B” on Figure 39.)
NOTE: Each set collar has two set screws.
To positively secure each set collar, drill a
shallow recess in sleeve through the set
screw holes. Retain set screws with a low
strength loctite, 271, or equal.
NOTE: Steps 14 through 26 must be
completed within 10 to 12 minutes to assure
proper placement of mechanical seals. The
mechanical seal used has an adhesive on the
inner diameter of the elastomer. The rotating
element must go into the casing before this
sealant bonds to sleeve.
14. Lightly coat the outboard end of the shaft
sleeve with STP motor oil treatment or
equal and slide the mechanical seal head
(0-400-0) onto the shaft sleeve against the
set collar.
FIGURE 47 – SEAL HEAD INSTALLATION
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