Goulds Pumps 3996 - IOM - Manual (Page 38)

8. Unscrew impeller (101) from shaft (122). The
threads are right-hand. Prevent the shaft turning by
using a wrench on coupling “flats”. Do not lose or
damage the O-ring (412A) which seals between the
impeller (101) and shaft (122) or shaft sleeve (126).
9. On units with mechanical seal (383).
a. Inside single or double seal – remove gland
stud nuts (355) and carefully slide gland (250)
off studs. Do not damage seal faces.
b. Outside seal – loosen set screws which position
rotary portion of seal and slide seal toward
bearing frame (228). Remove gland stud nuts
(355) and carefully slide gland (250) off studs.
Do not damage seal faces.
10. Remove stud nuts (370H) which hold stuffing box
cover (184) from frame. Do not allow stuffing box to
contact shaft (122), sleeve (126), shaft threads or any
mechanical seal parts. Slide sleeve (126), if any, off
shaft (122).
11. On units with mechanical seal, loosen set screws
which position rotary portion of seal to shaft (122)
and carefully slide seal and gland (250) assembly off
shaft. On units which have a shaft sleeve, (126), it is
not necessary to remove rotary portion of seal from
the sleeve unless replacement of seal is required.
12. Slide deflector (123) off shaft (122).
13. Scribe shaft (122) at coupling hub for proper
positioning of hub during reassembly and remove
hub.
14. Remove bearing housing bolts (370C). Impeller
adjustment bolts (370D) with jam nuts can be used to
assist in the removal of the shaft (122) and bearing
assembly from the bearing frame (228).
15. Slide complete shaft assembly from bearing frame.
This will include the shaft (122), both bearings (112
and 168), and bearing housing (134). Do not lose or
damage O-ring (496). Do not damage inboard grease
seal (333).
16. Pull inboard bearing (168).
17. Remove bearing retaining ring (361A) and slide
bearing housing off ball bearing. Do not damage
bearing housing grease seal (332).
18. Straighten “tang” in lockwasher (382) and remove
bearing locknut (136) and lockwasher. Pull ball
bearing (112).
19. On units with stuffing box packing, remove packing
(106) and lantern ring (105) from stuffing box cover
(184).
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3996 IOM 9/2010