Goulds Pumps 3296M - IOM - Manual (Page 66)

CHANGING THE IMPELLER
1. Refer to Section 6, Preparation for Disassembly
l Note and observe all warnings.
l Follow steps 1 through 7.
2. Remove bearing frame foot bolts from baseplate
and note the presence of any shims between frame
foot and baseplate. Save shims and reuse during
installation.
3. Remove casing nuts (425) and remove back
pull-out assembly from casing (Fig. A).
4. Remove casing gasket (351) and discard (Fig. A).
5. Place shaft wrench on coupling end of shaft and
remove impeller bolt (198), lockwasher (199A)
and impeller washer (199).
6. Remove impeller (101). It may be necessary to
use a puller. Puller must be placed as close to
vanes as practical so as not to damage the
impeller.
NOTE: At this time, maintenance can be
conducted on the flush screen or the wear ring.
Refer to the appropriate steps in Section 6.
7. Ensure keyway on replacement impeller is free of
burrs.
8. Clean old spacer gasket (360) from rotary sleeve
bearing face (117D) and replace with new gasket.
9. Make an impeller installation tool similar to that
shown in Fig. B.
l
! CAUTION
Do not use force such as a press or a hammer to
install impeller as the driven shaft (122A) will slide
rearward. This will loosen the bearing stack and
cause damage to the sleeve bearings, the
remaining spacer gaskets (360) and possibly the
containment shell (750).
10. Thread jacking nut on threaded rod back about 6
inches (150 mm).
11. Place spool on threaded rod against nut and
impeller on threaded rod against spool.
12. Carefully align impeller bore with driven shaft
(122A) and install threaded rod into impeller
screw hole in shaft (Fig. C).
13. Tighten jacking nut by hand until impeller is
supported by end of shaft and spool (Fig. C).
62
3296 M Group 6/05
Fig. B
Fig. C
Fig. A