Goulds Pumps 3408 - IOM - Manual (Page 47)

3408 IOM 03/99
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4. Tap the stuffing boxes with a soft-headed
hammer to break the seal between the stuffing
box and lower casing half, and lift the rotating
element out of the lower casing. Rotating
element may now be removed to suitable
location to work on.
NOTE: A spare rotating element can be
installed at this point.
5. Remove four cap screws (3-904-9) from each
bearing housing (3-025-3 and -4) and remove
the bearing housings from the shaft (3-007-0).
6. Bend back lockwasher tab and remove locknut
(3-516-4) and lockwasher (3-517-4) from the
outboard end of the shaft and, using a puller,
remove the outboard bearing (3-026-4) from
the shaft. Remove the inboard end bearing
(3-026-3) in the same manner.
NOTE: Locknut and lockwasher are not used
on inboard end bearing.
▲
! CAUTION
Do not reuse the ball bearings.
7. Slide both stuffing boxes (3-073-9) off of the shaft,
working deflector rings (3-136-9) off the shaft at
the same time. (See Fig. 30)
8. Remove lip seals (3-177-9) and O-rings (3-914-1)
from the stuffing boxes.
9. Drive both mechanical seal seats (3-401-0)
from both the stuffing boxes.
10. Remove mechanical seal head (3-402-0) from
the pump shaft.
11. Remove two casing rings (3-003-9) from the
impeller (4-002-0) and remove O-ring
(3-914-2) from each casing ring. (See Fig. 31)
12. Remove the impeller retaining ring (3-915-1)
with retaining ring pliers (Fig. 32). Heat the
impeller hub on both ends to 350° F maximum,
and pull or push the impeller from the shaft.
(Instead of heating impeller, you may press
impeller off of shaft, if a press is available.)
NOTE: Press away from coupling end.
NOTE: For impellers with replaceable rings —
remove the rings (0-004-0), if necessary, by
cutting with a cold chisel. (See Fig. 33)
13. Remove the impeller key (3-911-1) from the shaft.
Fig. 29
Fig. 31
Fig. 30
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