Goulds Pumps API 3171 - IOM - Manual (Page 50)

Impeller parts When to replace
Pumpout vanes When worn or bent more than 1/32 in. (0.8 mm)
Vane edges When you see cracks, pitting, or corrosion damage
Gaskets, 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.
Column sections
Inspect the column section(s) (306, 192) for any cracks or excessive corrosion damage. Replace if
necessary.
Motor support
Inspect the motor support (240) for any cracks or excessive corrosion damage. Replace if necessary.
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 0.001 in. (0.03 mm).
NOTICE:
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
Check the shaft surface for damage, especially in areas indicated by the arrows in the following figure.
Replace the shaft if it is damaged beyond reasonable repair.
Bearings inspection
Condition of bearings
Do not reuse bearings. The condition of the bearings provides useful information on operating conditions
in the bearing frame.
Checklist
Perform these checks when you inspect the bearings:
• Inspect the bearings for contamination and damage.
• Note any lubricant condition and residue.
• Inspect the ball bearings to see if they are loose, rough, or noisy when you rotate them.
• Investigate any bearing damage to determine the cause. If the cause is not normal wear, correct the
issue before you return the pump to service.
Maintenance
48 Model API 3171 Installation, Operation, and Maintenance Manual