Goulds Pumps 3910 11th ed. - IOM - Manual (Page 53)

2. Install impeller (101) on shaft (122).
NOTE: Anti-galling compound should be applied to
the impeller bore to aid in assembly and disassembly.
3. Install impeller nut (304) and tighten to torque values
shown in Table 7.
NOTE: Impeller nut has LEFT HAND threads.
4. Tighten the set screw (198A) in the end of the impeller
nut (304).
5. Check for free turning. If rubbing or excessive drag is
detected, determine cause and correct.
NOTE: It is desirable to repeat runout check on
impeller wear ring surface as previously described in
“Replacement of Wear Rings.”
INSTALLATION OF COUPLING HUB
Install key and pump half coupling hub on shaft (122) until
hub is flush with the scribe mark determined during
disassembly (Fig. 58). Refer to coupling manufacturer’s
instructions for assistance.
INSTALLATION OF BACK
PULL-OUT ASSEMBLY IN CASING
1. Install new casing gasket (351) on gasket surface of
casing (100).
NOTE: Anti-galling compound may be applied to the
casing fits to aid in assembly and disassembly.
2. Replace back pull-out assembly in casing (100) using
Goulds back pull-out device or other suitable means.
Refer to instructions in Appendix III.
3. Lower back pull-out assembly into proper position in
casing (100) by loosening jacking bolts (418) evenly.
NOTE: Ensure that casing gasket is not damaged.
4. Install casing stud nuts (425).
5. Inspect gap between seal chamber cover (184) and casing
(100) and adjust casing stud nuts (425) as necessary to
make gap uniform.
6. Tighten casing stud nuts (425) uniformly, using
alternating pattern, until seal chamber cover (184) is in
metal-to-metal contact with the casing (100). Tighten
each nut to torque value shown in Table 7.
7. Check for free turning. If rubbing or excessive drag is
detected, determine cause and correct.
ADDITIONAL ASSEMBLY
1. Replace coupling spacer, coupling guard and auxiliary
piping, tubing, and equipment that were removed
during preparation for disassembly.
2. Lubricate bearings as described in the Preventive
Maintenance section.
POST ASSEMBLY CHECKS
!
All checks and procedures listed under Safety,
Installation, Operation and Preventive
Maintenance sections must be followed.
!
Rotate shaft by hand to ensure it rotates smoothly and
there is no rubbing which could lead to excess heat
generation and or sparks.
3910-1
1th IOM 5/08
53
Fig. 58
6