Disassembly And Reassembly; Disassembly Of Pump - Goulds Pumps 3935 Installation, Operation And Maintenance Instructions

Disassembly and reassembly

Disassembly and reassembly

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.
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).
6. Loosen set screw in coupling hub (233), and remove hub and key (400) from stub shaft
7. Loosen bolt (371U) so that discharge head (152) can turn in pump foot (131). Do not
8. Slide a heavy bar or pipe through frame being careful not to let the bar contact the stub
9. Set pump in a vertical position, resting on the frame (228 or 228A). Remove discharge
10. Note location of casing 0-rings (412K) and record.
11. Remove the shaft retaining ring (361) and shims
12. Slide diffusers (150), impellers (101), shims (331) and intermediate bearings (260) off shaft
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
16. Remove seal from shaft only if it is to be replaced. Use care to avoid cutting rubber bellows
17. To remove the drive sleeve (522) and split collet (524) from the shaft, tap the drive sleeve
10
NOTICE: If pump has handled corrosive liquids, the motor end should be elevated to
assure complete draining. Flushing is recommended.
NOTICE: For pumps with other than insert-type couplings, If oil level is too high (splashes
out of breather), lower level 1.5mm | 0.06" at a time until splashing stops see coupling
manufacturer's instructions for removal.
(380).
remove pump foot at this time.
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.
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 required will be the total pump length, less motor, plus the length of the
casing (100).
(331) from shaft (122). Remove sleeves (157). Mark all parts for reassembly.
(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.
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.
on splined teeth of pump shaft. Remove retaining ring (361D) from shaft.
NOTICE: BP20 does not use a retaining ring.
(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
Model 3935 Installation, Operation and Maintenance Instructions