Bell & Gossett AC8584D Series HSCS Base Mounted Centrifugal Pumps - Manual (Page 25)

2
5
(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).
56;,! A spare 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).
56;,! 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).
56;,! Apply heat uniformly to the shaft sleeve to loosen
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.
56;,! For impellers with replaceable rings - remove the
rings (4-004-9) by cutting the rings with a cold chisel. (See
Figure 20)
-0.<9,¶*(:05.(5+047,33,9905.:
*(<;065!
DO NOT REUSE THE BALL BEARINGS.
*(<;065!
DO NOT EXCEED 275ºF.