Goulds Pumps 3393 - IOM - Manual (Page 80)

Maintenance
Cartridge mechanical seal replacement
Cartridge-type mechanical seals should be serviced by the seal manufacturer. Refer to the
instructions from the mechanical seal manufacturer for assistance.
Coupling guard replacement
Repair or replace the coupling guard if you notice corrosion or other defects.
O-rings, and seats replacement
• Replace all gaskets and O-rings at each overhaul and disassembly.
• Inspect the seats. They must be smooth and free of physical defects
• Replace parts if the seats are defective.
Additional parts
Inspect and either repair or replace all other parts, if inspection indicates continued use would
be harmful to satisfactory and safe pump operation.
Inspection must include these items:
• Bearing end covers (119)
• Labyrinth seals (332A and 333A)
• Bearing locknut (136A)
• Impeller key (178), coupling key (400) and balance drum key (178R)
• Bearing lockwasher (382)
• All nuts, bolts, and screws
Shaft replacement guidelines
Shaft measurement check
Check the bearing fits of the shaft. If any are outside the tolerances shown in the Bearing fits
and tolerances table, then replace the shaft.
Shaft straightness check
Check the shaft straightness. Use "V" blocks or balance rollers to support the shaft on the
bearing fit areas. Replace the shaft if runout exceeds the values in the Shaft and rotor runout
requirements table.
Do not use shaft centers for the runout check as they may have been damaged during the
removal of the bearings or impeller.
Shaft surface check
78 Model 3393 Installation, Operation, and Maintenance Manual