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.
Drain pump through plug (408A) in bottom of casing adapter.
NOTICE:
If pump has handled corrosive liquids, the motor end should be elevated to assure complete
draining. Flushing is recommended.
4.
If pump is oil lubricated, drain oil through oil drain plug on bottom of bearing frame (228A).
5.
Unbolt and remove motor from frame (228 or 228A).
NOTICE:
For pumps with other than insert-type couplings, If oil level is too high (splashes out of breath-
er), lower level 1.5mm | 0.06" at a time until splashing stops see coupling manufacturer's in-
structions for removal.
6.
Loosen set screw in coupling hub (233), and remove hub and key (400) from stub shaft (380).
7.
Loosen bolt (371U) so that discharge head (152) can turn in pump foot (131). Do not remove pump
foot at this time.
8.
Slide a heavy bar or pipe through frame being careful not to let the bar contact the stub shaft (380).
Place a wrench on the discharge head. Unscrew the discharge head until casing (100) is loose.
Threads are right hand. Do not completely unscrew casing.
9.
Set pump in a vertical position, resting on the frame (228 or 228A). Remove discharge head (152)
and pump foot (131). Unscrew and remove casing (100) from casing adapter (108). The casing
must be removed vertically so that the pump shaft is not bent. The total overhead clearance re-
quired will be the total pump length, less motor, plus the length of the casing (100).
10. Note location of casing 0-rings (412K) and record.
11. Remove the shaft retaining ring (361) and shims
(331) from shaft (122). Remove sleeves (157). Mark all parts for reassembly.
12. Slide diffusers (150), impellers (101), shims (331) and intermediate bearings (260) off shaft (122).
Also, note that some pumps may have spacer blanks (150A) substituted for some of the stages.
These will be located at the discharge end of the pump. Mark each impeller, diffuser, intermediate
bearing and shim washer to identify its position with the pump to aid in reassembly.
13. Remove impeller key (178) from shaft.
14. Unbolt and remove casing adapter (108) from seal housing (159).
15. 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.
16. 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.
NOTICE:
BP20 does not use a retaining ring.
17. To remove the drive sleeve (522) and split collet (524) from the shaft, tap the drive sleeve (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 sleeve should be used for this. Spread the split collet with
suitable tool, remove it from the groove in the shaft and slide if off the shaft.
18. Remove seal seat mount (158) if not already pulled. (228 or 228A).
7 Disassembly and reassembly
18
Model 3935 Installation, Operation and Maintenance Instructions
Содержание GOULDS PUMPS 3935
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