Goulds Pumps 3640 - IOM - Manual (Page 76)

Maintenance
NOTICE:
• Make sure that all parts and threads are clean and that you have followed all directions
under the Preassembly inspections section.
• Check for magnetism on the pump shaft and degauss the shaft if there is any detectable
magnetism. Magnetism attracts ferritic objects to the impeller, seal, and bearings which
can result in excessive heat generation, sparks, and premature failure.
1. Assemble the impellers (101, 145), the impeller sleeve (443A), and the casing spacer
(443D) onto the shaft. You must check the impeller sleeve runout and turn the impeller
rings before installing the casing spacer (443D). The impeller is a slip fit onto the shaft
(0.0005 in. to 0.002 in. [0.0127 mm to 0.0508 mm] clearance). Position the impeller to the X
value recorded during disassembly, or refer to the Impeller setting table in the Disassembly
section. Apply a liberal amount of an anti-seize compound onto the shaft.
2. Assemble the impeller locknuts.
One locknut has a right-hand thread, the other one has a left-hand thread.
If this is a repair, it is likely that only one locknut was removed. Keep the second locknut on
the shaft in order to maintain the impeller centering. Use the previously recorded dimension
from the bearing shoulder to the face of the impeller hub, or refer to the Impeller setting
table in the Disassembly section.
NOTICE:
Make sure the threads are clean. Deburr if necessary. Apply an anti-seize compound to the
threads.
3. Install the impeller wear rings (142, 144).
See Replace the wear rings in the Preassembly inspections section.
4. Install the casing and head wear rings (164, 164A) and the spacer bushing (206).
See Replace the wear rings in the Preassembly inspections section.
5. Install the throat bushings (125, 125B).
See Replace the throat bushings in the Preassembly inspections section.
NOTICE:
The impeller and wear-ring clearance setting procedures must be followed. Improperly
setting the clearance or not following any of the proper procedures can result in sparks,
unexpected heat generation, and equipment damage.
6. Measure the TIR on the impeller wear rings, impeller locknuts, and bearing fits.
The shaft is the datum point. Measure the runout of the wear rings, sleeve, and impeller
nuts to the shaft with a dial indicator.
74 Model 3640 Installation, Operation, and Maintenance Manual