Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 44)

2. Remove all casing main joint cap screws
(2-904-1) and dowels (2-916-1). Remove
external tubing (0-952-0) if supplied.
3. Insert a screwdriver or pry bar into the
slots between the upper and lower casing
halves, and separate the halves, lifting off
the upper casing half. (NOTE: Some
casings have jacking screws.)
FIGURE 40 – PUMP WITH MECHANICAL
SEALS ON SHAFT SLEEVES
4. Tap the stuffing boxes with a soft-headed
hammer to break the seal between the
stuffing box and lower casing half, and lift
the rotating element out of the lower
casing. Rotating element may now be
removed to a suitable location to work on.
NOTE: A spare rotating element can be
installed at this point.
FIGURE 41 – ROTATING ELEMENT
5. Remove four cap screws (3-904-9) from
each bearing housing (3-025-3 and -4)
and remove the bearing housings from the
shaft (3-007-0).
6. Bend back lockwasher tab and remove
locknut (3-516-4) and lockwasher (3-517-
4) from the outboard end of the shaft and,
using a bearing or gear puller, remove the
bearing (3-026-4) from the shaft. Remove
the inboard end bearing (3-026-3) in the
same manner.
NOTE: Locknut and lockwasher are not used
on inboard end bearing.
CAUTION:
DO NOT REUSE THE BALL BEARINGS.
7. Slide both stuffing boxes (3-073-9) off of
the shaft, working deflector rings (3-136-9)
off the shaft at the same time (See
Figure 42).
A
VENT PLUG
B
DRAIN PLUG
C
DRAIN PLUG
FIGURE 42 – REMOVING STUFF BOX AND
DEFLECTOR
8. Remove lip seals (3-177-9) and O-rings
(3-914-1) from the stuffing boxes.
9. Drive both mechanical seal seats (3-401-
0) from both the stuffing boxes.
10. Remove mechanical seal head (0-400-0)
from the pump shaft sleeve. If the set
collar (3-421-0) must be removed, scribe a
line on the shaft sleeve (3-009-9) flush
with the end of the seal (to record
mechanical seal location).
11. Remove two casing rings (3-003-9) from
the impeller (4-002-0) and remove O-rings
(3-914-2) from each casing ring (See
Figure 43).
NOTE: Each casing ring on 10x8x20 and
12x10x18 has 2 O-rings (See Figure 21B).
12. Loosen set screw (3-902-3) in shaft nuts
(3-015-9) and then remove sleeve nuts
using pin spanner wrench. Remove O-
rings (3-914-9) from counterbore in shaft
sleeves.
NOTE: Both shaft nuts have right hand
threads.
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