Xylem AC8584C Series HSCS Base Mounted Centrifugal Pumps - Manual (Page 20)

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(See Appendix “A” for exploded view.)
1. Close valves on suction and discharge sides of pump. If
no valves have been installed, it will be necessary to drain
the system.
2. Remove the coupler guard. Refer to section titled “Hex
Coupler Guard Removal/Installation.
3. Loosen the capscrews which secure the coupler flanges
to the coupler hubs. Remove the coupler flanges and
sleeve by compressing the flanges and pulling out from
beneath the hubs or by loosening the allen set screws and
sliding the hubs back on the shafts. Remove the coupler
hub from the pump shaft.
4. Drain the pump by opening vent plug (0-910-0) and
remove drain plugs (0-910-0) on suction and discharge
nozzle.
5. Remove seal lines (0-901-0, 0-950-0, 0-952-0), if supplied.
6. Remove gland bolts (3-904-9), washers (1-909-9) and
slide gland (3-014-2) away from casing.
7. Remove all casing main joint cap screws (2-904-1) and
dowels (2-916-9). Use slot in casing main joint and sepa-
rate the casing halves with a pry bar. Lift upper half casing
(2-001-7) by cast lugs.
8. Remove packing (1-924-9) and seal cage (1-013-2) from
each stuffing box.
9. Remove cap screws (1-904-9) which hold bearing
housings (3-025-2) to the casing and lift rotating element
out of lower casing (2-001-08). Rotating element may now
be moved to a suitable working location.
10. Pull coupling half and key (3-911-2) off shaft (3-007-0).
NOTE: A spar e rotating element can be installed at this
point.
11. Remove cap screws (3-904-9) from bearing covers (3-018-
3, -4).
12. Remove bearing housings (3-025-2), locknut (3-516-4),
and lockwasher (3-517-4). Mount bearing puller and
remove bearings (3-026-2). Remove thrust washer
(3-078-9) and snap ring (3-915-9).
NOTE: Locknut, lockwasher , and thrust washer are not
used on inboard bearing.
13. Remove bearing covers (3-018-3, -4) and push oil seals
(3-177-9) out of bearing covers and coupling end bearing
housing. Pull deflectors (3-236-9) off shaft.
14. Remove casing rings (3-003-9) from impeller (4-002-0).
15. Remove set screw (3-902-9) from shaft nuts. Remove
shaft nuts (3-015-9), O-rings (3-914-9), sleeves (3-009-
9)sleeve gaskets (1-428-1) and impeller (4-002-0).
NOTE: Apply heat uniformly to the shaft sleeve to loosen
the sealant between the shaft and sleeve. DO NOT HEAT
ABOVE 275ºF. To further assist in removing the sleeves,
hold the shaft vertically and drop it on a block of wood.
The impeller weight should force both the impeller and
sleeve from the shaft.
16. Refer to page 26 if pump is equipped with adjustable
rings.
NOTE: For impellers with r
eplaceable rings-remove the
rings (4-004-9) by cutting the rings with a cold chisel. (See
Figure 14).
ASSEMBL Y (PUMP WITH PACKING)
All bearings, O-rings, lip seals, gaskets, impeller rings, and
casing wear 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 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. Place impeller key (3-911-1) in shaft (3-007-0).
2. Check the impeller (4-002-0) and casing to determine the
correct impeller rotation (See Figure 16) and locate the
impeller on the shaft per dimension “A”. (See Figure 12)
NOTE: For impeller with r
eplaceable rings, heat each new
ring (4-004-9) and slide it onto the impeller. Hold rings
against the impeller shoulder until they cool. (See Figure
14)
3. Place both shaft sleeve keys (3-911-3) on shaft (3-007-0).
4. Slide sleeve gaskets (1-428-1) onto shaft and against
hubs of impeller.
5. Slide sleeves (3-009-9) onto shaft.
CAUTION: Extreme Temperature Hazard
Allow pump temperatur e to reach acceptable levels
before proceeding. Open drain valve, do not proceed until
liquid stops coming out of drain valve. If liquid does not
stop flowing from drain valve, isolation valves are not seal-
ing and should be repaired before proceeding. After liquid
stops flowing from drain valve, leave valve open and con-
tinue. Remove the drain plug located on the bottom of the
pump housing. Do not reinstall plug or close drain valve
until reassembly is completed. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.
CAUTION:
DO NOT REUSE THE BALL BEARINGS.
FIGURE 13 – COMPLETE ROT ATING ELEMENT LESS
PACKING AND GLAND