Goulds Pumps 3910 11th ed. - IOM - Manual (Page 32)

REMOVAL OF BACK PULL-OUT
ASSEMBLY
1. Loosen and remove casing stud nuts (425).
2. Separate back pull-out assembly from casing (100) by
tightening jacking bolts (418) provided. Tighten
jacking bolts evenly using alternating pattern (Fig. 13).
NOTE: Penetrating oil may be used if seal chamber
cover to casing joint is excessively corroded.
3. Remove back pull-out assembly using Goulds back
pull-out device or other suitable means. Refer to
instructions in Appendix III.
s
! WARNING
Pump components are heavy. Proper methods of
lifting and securing must be employed to avoid physical
injury and/or equipment damage.
4. Remove and discard casing gasket (351). (Replace this
with new gasket during reassembly.)
5. Secure to prevent movement during transport.
Transport back pull-out assembly to a clean work area
for further disassembly.
6. Support and secure back pull-out assembly firmly to
workbench.
REMOVAL OF IMPELLER
1. Loosen set screw (198A) in end of impeller nut (304)
(Fig. 14).
2. Loosen and remove impeller nut (304).
NOTE: Impeller nut has LEFT HAND threads.
3. Pull impeller (101) from shaft (122). Use a spanning
type puller if required.
$
CAUTION
When handling the impeller, wear heavy work gloves to
prevent cutting hands on sharp edges.
4. Remove impeller key (178).
REMOVAL OF COUPLING HUB
1. Blue and scribe shaft (122) for relocating coupling hub
during reassembly (Fig. 15).
2. Remove coupling hub.
REMOVAL OF SEAL CHAMBER
COVER
1. Loosen and remove gland stud nuts (355 )(Fig. 16).
2. Slide cartridge mechanical seal away from seal
chamber cover (184).
3. Install eyebolt in tapped hole provided in seal chamber
cover (184).
4. Rig lifting sling to eyebolt and to overhead lifting
device. Take light strain on sling.
32
3910-1
1th IOM 5/08
Fig. 13
Fig 14
Fig. 15