Goulds Pumps 3408 - IOM - Manual (Page 53)

3408 IOM 03/99
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NOTE: For impellers with replaceable rings -
remove the rings (0-004-0), if necessary, by
cutting with a cold chisel. (See Fig. 44)
(3-009-9)
SLEEVE
(0-004-0)
IMPELLER RING
(3-003-9)
CASING RING
LOCKING PIN
(3-943-9)
CASING
(2-001-0) IMPELLER
(4-002-0)
ASSEMBLY (PUMP WITH MECHANICAL SEALS ON SHAFT SLEEVES)
All bearings, O-rings, lip seals, mechanical seals,
gaskets, impeller rings, and casing 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 by 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. Assemble the impeller key (3-911-1) in the shaft
key slot.
2. Check the impeller (4-002-0) and casing to
determine the correct relationship (See Fig. 16)
and locate the impeller on the shaft per
dimension “C” given in the table on Fig. 39.
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 should 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.
▲
! CAUTION
The pin in each shaft sleeve must seat in the
impeller key slot.
Fig. 44
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