Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 35)

the gasket, lightly tapping with a ball peen hammer
so that it is flush with the inside edges of the
casing.
NOTE: Precut casing gaskets (2-153-5 & 6)
can be ordered to minimize the amount of
trimming.
1. Assemble the impeller key (3-911-1) in the
shaft key slot.
2. Check the impeller (4-002-0) and casing
to determine the correct relationship (See
Figure 16) and locate the impeller on the
shaft per dimension “A” given in the table
on Figure 17.
NOTE: For impeller with replaceable
rings, heat each new ring (0-004-0)
(approximately 300°-400°F for bronze)
and slide onto the impeller. Using gloves,
hold rings against the impeller shoulder
until they cool.
3. Starting with the outboard end, apply a
1/4" bead of RTV (DOW CORNING
SILICONE SEALANT or equivalent) at the
impeller hub face, making sure to fill up
the keyway.
4. Slide the sleeve (3-009-9) onto shaft,
rotating the sleeve to evenly distribute the
sealant applied in step 3. Refer to
Optional Method of Installing Packing at
the end of this section before mounting
sleeve on shaft.
CAUTION:
THE PIN IN EACH SHAFT SLEEVE MUST
SEAT IN THE IMPELLER KEY SLOT.
5. Place the sleeve O-ring (3-914-9) onto the
shaft, into the sleeve counterbore.
Assemble the shaft sleeve nut (3-015-9).
6. Repeat steps 3 through 5 for the inboard
shaft sleeve, O-ring and nut. Wipe off
excess RTV.
7. Verify that Dimension “A” in Figure 17 on
page 32 is maintained, then using a pin
scanner wrench and hammer, securely
tighten the shaft sleeve nuts. Then, drill a
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 serrated head set screws
(3-902-3) (See Figure 22). A low strength
sealant, such as Loctite 271, can be used
to retain set screws.
FIGURE 22 – 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 (See Figure 23).
NOTE: 10x8x20 and 12x10x18 utilize
“Floating” Casing Ring Design. Each ring
requires 2 O-rings (See Figure 21B).
9. Press a new lip seal (3-177-9) into each
stuffing box. Before installing the seal,
lubricate the seal lip with a lightweight oil.
NOTE: Lip seals should seat against
machined shoulder in bracket.
FIGURE 23 – INSTALLING RINGS
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 (See Figure 24).
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