Goulds Pumps 3408 - IOM - Manual (Page 48)

44
3408 IOM 03/99
Fig. 33
(3-003-9)
CASING RING
LOCKING PIN
(3-943-9)
(3-009-9)
SLEEVE
(0-004-0)
IMPELLER RING
CASING
(2-001-0)
IMPELLER
(4-002-0)
ASSEMBLY (PUMP WITH MECHANICAL SEALS ON SHAFT)
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).
Heat the impeller evenly to 300° F maximum to
expand the bore. (Impeller may be pressed onto
the shaft instead of heating if a suitable press is
available. (See Fig. 34) NOTE: For impeller with replaceable rings, heat
each new ring (0-004-0) (approximately 300° F -
400° F for bronze) and slide onto the impeller.
Using gloves, hold rings against the impeller
should until they cool.
3. From the outboard end, slide the heated impeller
(4-002-0), using gloves, onto the shaft (3-007-0) against
the shaft shoulder, and install retaining ring (3-915-1).
Fig. 34
Fig. 32