Xylem AC8584C Series HSCS Base Mounted Centrifugal Pumps User Manual

Page 24

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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) 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 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.

9. 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.

10. Remove cap screws (3-904-9) from bearing covers (3-018-3,

-4).

11. 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 side.

12. Remove bearing covers (3-018-5, -4) and push oil seals

(3-177-9) out of bearing covers and coupling and bearing

housing. Pull deflectors (3-136-9) off shaft.

13. Remove glands (3-014-2). Loosen set screws and remove

mechanical seal head assembly (3-402-0). Press mechan

ical seal seats (3-401-0) from glands.

14. Remove casing rings (3-003-9) from impellers (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 loosenÊ

the sealant between the shaft and sleeve.

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 20)

FIGURE 20 – CASING AND IMPELLER RINGS

CAUTION:

DO NOT REUSE THE BALL BEARINGS.

CAUTION:
DO NOT EXCEED 275ºF