7 Disassembly and Reassembly
7.1 Disassembly of pump
1.
Lock out power source.
2.
Shut off valves controlling flow to and from pump. Disconnect piping.
3.
Uncouple pump. See coupling manufacturer's instructions for removal.
4.
Drain oil through oil drain plug on bottom of bearing frame (228A)
5.
Drain pump through plug (408A)in bottom of casing adapter. If pump has handled corrosive liquids,
the motor end should be elevated to assure complete draining. Flushing recommended.
6.
Loosen set screw in coupling hub (233) and remove hub and key (400) from stub shaft. (330)
7.
Loosen pump foot retaining bolt (371U) so that the discharge head (152) can turn in casing (100).
Do not remove pump foot at this time.
8.
Place a wrench on the discharge head (152). Loosen the discharge head. Insure casing (100) is
free to turn on case adapter (108). Threads are right hand. Do not completely unscrew discharge
head or casing.
9.
Set pump in a vertical position. It will be necessary to secure the bearing frame (228A) to a suitable
support high enough off floor to protect the pump shaft from damage. Remove discharge head
(152) and pump foot (131). Unscrew and remove casing (100) from case adaptor (108). The casing
must be removed vertically so that the pump shaft will not be bent. The total overhead clearance
required will be the total pump length plus the length of the casing (100).
10. Remove the shaft retaining ring (361) and shims (331) from shaft (122). Remove sleeves (157).
Mark all parts for reassembly.
11. Slide diffusers (150), impellers (101), shims (331) and intermediate bearings (260) off shaft (122).
Also, note spacer blanks (150A) substituted for some of the stages. These will be located at the dis-
charge end of the pump. Mark each impeller, diffuser, intermediate bearing and shim washer to
identify its position in the pump to aid in reassembly.
12. Remove impeller key (178) from shaft.
13. Unbolt and remove casing adapter (108) from bearing end cover (109c).
14. Remove pump shaft (122) from splined end of stub shaft. For pumps with special mechanical seal
arrangements, the seal seat mount (158) is removed when the shaft is pulled out of the splined end
of the stub shaft. This must be done carefully to avoid mechanical seal damage.
15. Remove seal from shaft only if it is to be replaced. Use care to avoid cutting rubber bellows on
splined teeth of pump shaft. Remove retaining ring (361D) from shaft.
16. To remove the drive collar (522) and split collet (524) from the shaft, tap the drive collar (522) away
from the splined end of the shaft (122) and off the split collet (524). A piece of pipe sized to seat
against the larger end of the drive collar should be used for this. Spread the split collet with a suita-
ble tool, remove it from the groove in the shaft and slide it off the shaft.
17. Remove seal seat mount (158) if not already pulled in step 14. Note: Before dismantling bearing
frame, mark all pieces for reassembly.
18. Unbolt and remove bearing end cover (109C) and wave washer (529) from bearing frame (228A).
19. Unbolt and remove end cover. (109A).
20. Remove stub shaft assembly from bearing frame (228A).
21. Bend tang of bearing lockwasher (382) out of slot in bearing locknut (136).
22. Remove thrust bearing locknut (136) and bearing lockwasher (382)
23. Remove ball bearings (112A) and (168A) using a suitable puller or press. Care must be taken to
prevent damage to bearings if they are to be reused. Do not use a hammer to drive shaft through
bearings. Protect bearings from contamination.
7.2 Inspection and overhaul
1.
O-rings (412K) & (412L) - Inspect and replace if damaged.
7 Disassembly and Reassembly
3335 Installation, Operation and Maintenance Instructions
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