Goulds Pumps 3409 - IOM - Manual (Page 46)

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CAUTION
Do not reuse ball bearings.
10. Remove bearing covers (109 & 119) and push bearing
isolators (332A & 333A) out of bearing covers and
coupling end bearing housing.
11. Remove glands (250). Loosen set screws and remove
mechanical seal head assembly (383). Press mechanical
seal seats (383) from glands.
12. Remove casing rings (127) from impeller (101).
13. Remove set screw (222B) from shaft nuts. Remove shaft
nuts (124), O-rings (497), sleeves (126), sleeve gasekts
(428), and impeller (101).
NOTE: Apply heat uniformly to the shaft sleeve to loosen
the sealant between the shaft and sleeve. DO NOT HEAT
ABOVE 275° F. To further assist in removing the sleeves,
hold the shaft vertically and tap it on a block of wood. The
impeller weight should force both the impeller and sleeve
from the shaft.
14. Refer to Adjustable Wear Ring Section if pump is equipped
with adjustable rings.
NOTE: For impellers with replaceable rings - remove the
rings (142) by cutting the rings with a cold chisel.
ASSEMBLY (PUMP WITH MECHANICAL SEALS)
All bearings, O-rings, 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 should be made
using the 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.
NOTE: Precut casing gaskets (351D & 351S) can be
ordered to minimize the amount of trimming.
1. Place impeller key (178) in shaft (122).
2. Check the impeller (101) and casing (100) to determine the
correct impeller rotation (See
Fig. 15) and locate the impeller on the shaft per dimensiton
“A”. (See Fig. 23)
NOTE: For impellers with replaceable rings, heat each
new ring (142) and slide it onto the impeller. Hold
rings against the impeller shoulder until they cool. (See
Fig. 24)
3. Place both shaft sleeve keys (401) on shaft (122).
4. Slide sleeve gaskets (428) onto shaft and against hubs of
impeller.
5. Slide sleeves (126) onto shaft.
6. Place the sleeve O-ring (3-914-9) onto the shaft, into
the sleeve counterbore. Verify that Dimension “A”
(Fig. 23) is maintained, then using a pin spanner
wrench and hammer, securely tighten the shaft sleeve
nuts (3-015-9). Then, drill a shallow recess in the
shaft through the set screw hole in each of the shaft
sleeve nuts. Lock each shaft sleeve nut in position
with cup point set screws (3-902-9). (See Fig. 29) A
low strength sealant, such as Loctite 271, can be used
to retain set screws.
46
3409 IOM 11/04
(126)
Sleeve
(142)
IMPELLER RING
(127)
CASING
RING
(445A)
LOCKING PIN
(100)
CASING
(101)
IMPELLER
Fig. 24