Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 42)

NOTE: A locknut and lockwasher are not
installed on the inboard end of the shaft.
CAUTION:
DO NOT EXCEED 275°F.
18. Clean the gasket surfaces of the casing.
Apply Scotch 3M-77 spray adhesive or
equivalent to the lower half of the casing.
12. Heat the ball bearing (3-026-4), using
either dry heat or a 10-15% soluble oil and
water solution.
19. Within one minute of spraying, set the
untrimmed gaskets (2-123-5 and -6) in
place on the lower half casing, align the
holes in the gaskets with the holes in the
casing and press the gaskets firmly
against the lower half casing face in the
area coated by the adhesive.
13. Using gloves, slide the heated bearing
onto the shaft against the shaft shoulder
(See Figure 37).
20. Trim the gaskets flush with the lower
casing bores, if this has not been done as
yet.
CAUTION:
Machined casing bores must remain sharp
at the casing parting line. Gaskets must be flush
with bore in order to contact O-rings. Leakage can
result around stuff box O-ring if this step is not
properly followed.
FIGURE 37 – INSTALLING SHAFT BEARING
14. Install lockwasher (3-517-4) and locknut
(3-516-4) on the outboard end of the shaft.
Make certain locknut is secured and then
bend over tabs on lockwasher.
21. Set the rotating element in the pump
casing (2-001-0), assuring correct rotation.
Locate both stuffing box tongues in their
respective casing grooves. Locate pins (3-
943-9) in the stuffing box and the casing
wear rings in their respective slots at the
casing parting surface. Correct any O-ring
bulging.
15. Allow the bearing to cool to room
temperature. On grease lubricated
bearings only, coat the exposed sides with
two or three ounces of recommended
grease.
CAUTION:
Do not cut or damage O-rings when
lowering the rotating element into position. When
all four anti-rotation pins (3-943-9) are correctly
located, there will be some casing ring looseness.
16. On grease lubricated bearings, coat the
inside of the bearing housing (3-025-4)
with grease and slide into place over
bearing. Attaching the bearing housing to
the stuffing box with four cap screws (3-
904-9).
22. Lower the upper half casing (2-001-0) into
place using the tapered dowel pins (2-
916-1) and install casing main joint bolts
(2-904-1). The casing joint bolts should be
tightened to the following torques: 140 ft-lb
minimum for 5/8"-11 hex head cap screws
(Grade 5); 350 ft-lb minimum for 7/8"-9
Ferry Cap Counterbore screws (Grade 8).
Bolt torquing pattern is shown in Figure 59
on page 52.
NOTE: Torque values are essential in
obtaining proper gasket compression so no
leakage can occur at main joint.
FIGURE 38 – ROTATING ELEMENT
23. Rotate the shaft by hand to assure that it
turns smoothly and is free from rubbing or
binding. 17. Repeat steps 9 through 13, 15 and 16 for
the inboard end.
24. Install seal water piping (0-952-0).
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