Xylem P81875F Series HSC and HSC-S Centrifugal Pump - Manual (Page 24)

14. Remove the other seal, shaft sleeve and nut as described
in steps 11, 12 and 13.
NOTE: For impellers with replaceable rings – remove the
rings (4-004-9) by cutting the rings with a cold chisel.
15. Remove impeller key (3-911-1).
ASSEMBLY
All bearings, “O” rings, seals and gaskets 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 should be made using the upper half as a
template. Lay the gasket material on the casing joint and mark
it by pressing it against the edges of the casing. Trim the
gasket so that it is flush with the inside edges of the casing.
1. Assemble impeller key (3-911-1) in the shaft keyslot.
2. Check the impeller (4-002-0) and casing to determine the
correct impeller rotation (See Figure 33) and locate the
impeller on the shaft per dimension “C” given in Table on
page 20.
NOTE: For impellers with replaceable rings, heat each
new ring (4-004-9) and slide it onto the impeller. Hold
rings against the impeller shoulder until they cool.
3. Apply 1 / 2 " wide bead of LOCTITE or PERMATEX sealant
to outboard end of shaft – 3" from the impeller hub.
4. Slide sleeve (3-009-9) onto shaft, rotating the sleeve to
evenly distribute the sealant applied in step 3. On pumps
built after 1991, install sleeve O-ring onto the shaft, into
the sleeve counterbore.
IMPORTANT: The pin in sleeve must seat in the impeller
keyslot for proper sleeve alignment.
5. Assemble shaft sleeve nut (3-015-9).
IMPORTANT: Assure that dimension “C” is maintained.
Drill a shallow recess in the shaft through the set screw
hold in the nut. Lock the nut in position with the set screw
(3-902-3).
6. Repeat steps 3 through 5 for the inboard shaft sleeve.
7. Assemble “O” rings (3-914-2) in each casing ring
(3-003-9) and slide ring onto the impeller (See Figure 21).
8. Press a new oil seal (3-177-9) into each stuffing box
(3-073-9).
NOTE: Seal lip must point away from the bearing.
9. Lubricate and roll “O” ring (3-914-1) into the groove in
each stuffing box.
10. Press the stationary seats (3-401-0) of the mechanical
seals into both stuffing boxes. Lightly lubricate the stuff-
ing box bore to ease assembly (See Figure 13).
11. Obtain the set collar (3-421-9) locating dimension from
Table on page 20, and scribe the dimension on the shaft
sleeves. Install set collar on sleeve per dimension.
IMPORTANT: Steps 12 through 16 must be completed
within 10 to 12 minutes to assure proper placement of
mechanical seal.
12. Lightly coat the outboard end of the shaft sleeve with
soapy water or vegetable oil and slide the mechanical
seal head (3-402-0) onto the shaft sleeve against set
collar (See Photo 18).
13. Slide each stuffing box onto the shaft so that the shaft
end extends through the mechanical seal area, but
does not enter the oil seal. This will permit installation of
deflector (3-136-9).
CAUTION: Extreme Temperature and/or
Flying Debris Hazard
Eye protection and gloves required. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.
CAUTION: Extreme Temperature and/or
Flying Debris Hazard
Eye protection and gloves required. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.
CAUTION: Extreme Temperature and/or
Flying Debris Hazard
Eye protection and gloves required. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.
Photo 17 – Installing Lip Seal
Photo 18 – Seal Head Installation
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