Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 45)

FIGURE 43 – REMOVING CASING RINGS
FROM IMPELLER
13. To remove the sleeve, hold the shaft
vertically and drop it on a block of wood.
The impeller weight should force both the
impeller (4-002-0) and sleeve (3-009-9)
from the shaft.
NOTE: There is a silicone adhesive/sealant
between the sleeve and the impeller.
14. Remove the other seal, shaft sleeve,
sleeve O-ring and nut as described in
steps 11, 12, and 13.
NOTE: For impellers with replaceable rings –
remove the rings (0-004-0), if necessary, by
cutting with a cold chisel (See Figure 44).
FIGURE 44 – IMPELLER WITH WEAR RINGS
15. Remove the impeller key (3-911-1) from
the shaft.
ASSEMBLY (PUMP WITH MECHANICAL
SEALS ON SHAFT SLEEVES)
All bearings, O-rings, lip seals, mechanical seals,
gaskets, impeller rings, and casing rings should be
replaced with new parts during assembly. All
reusable parts should be cleaned of all foreign
matter before reassembling. The main casing joint
gasket can be made using the upper or lower half
as a template. Lay the gasket material on the
casing joint. Trim the gasket by lightly tapping with
a ball peen hammer so that it is flush with the
inside edges of the casing.
NOTE: Precut casing gaskets (2-123-5 and -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 “C” given in the table
on Figure 37.
NOTE: For impeller with replaceable rings, heat
each new ring (0-004-0) (approximately 300°F-
400°F for bronze) and slide onto the impeller.
Using gloves, hold rings against the impeller
shoulder until they cool.
(3-009-9)
SLEEVE
3. Starting with the outboard end, apply a
1/4" bead of RTV (DOWN 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.
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 “C” in Figure 39 on
page 43 is maintained, then using a pin
spanner wrench and hammer, securely
(0-004-0)
IMPELLER RING
(3-003-9)
CASING RING
LOCKING PIN
(3-943-9)
CASING
(2-001-0)
IMPELLER
(4-002-0)
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