Goulds Pumps 3408 - IOM - Manual (Page 43)

3408 IOM 03/99
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NOTE: There is a silicone adhesive/sealant
between the sleeve and the impeller.
13. Re move the other shaft sleeve, nut and sleeve
O-ring as de scribed in steps 11 and 12.
NOTE: For impellers with replaceable rings —
remove the rings (0-004-0), if necessary, by
cutting with a cold chisel. (See Fig. 21A)
14. Re move the im pel ler key (3-911-1) from the shaft.
ASSEMBLY (PUMP WITH PACKING)
All bearings, O-rings, lip seals, gasket, 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. Trim the gasket, lightly tapping with a
ball peen hammer so that it is flush with the inside
edges of the casing.
NOTE: Precut casing gaskets (2-123-5 & 6) can
be ordered to minimize the amount of trimming.
1. As sem ble the im pel ler key (3-911-1) in the shaft
key slot.
2. Check the im pel ler (4-002-0) and cas ing to
de ter mine the cor rect re la tion ship (See Fig. 16)
and lo cate the im pel ler on the shaft per di men sion
“A” given in the ta ble on Fig. 17.
NOTE: For impeller with replaceable rings, heat
each new ring (0-004-0) (approximately 300° -
400° F for bronze) and slide onto the impeller.
Using gloves, hold rings against the impeller
shoulder until they cool.
3. Starting with the outboard end, apply a 1/4" bead
of RTV (DOW CORNING SILICONE SEALANT or
equivalent) at the impeller hub face, making sure
to fill up the keyway.
4. Slide the sleeve (3-009-9) onto shaft, rotating the
sleeve to evenly distribute the sealant applied in
step 3. Refer to Optional Method of Installing
Packing at the end of this section before mounting
sleeve on shaft.
▲
! CAUTION
The pin in each shaft sleeve must seat in the
impeller key slot.
5. Place the sleeve O-ring (3-914-9) onto the shaft,
into the sleeve counterbore. Assemble the shaft
sleeve nut (3-015-9).
6. Repeat steps 3 through 5 for the inboard shaft
sleeve, O-ring and nut. Wipe off excess RTV.
7. Verify that Dimension “A” is maintained, then
using a pin spanner wrench and hammer,
securely tighten the shaft sleeve nuts. 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 serrated
head set screws (3-902-3). (See Fig. 22) A low
strength sealant, such as Loctite 271, can be
used to retain set screws.
Fig. 21B
Fig. 22
6
O-RING
O-RING