•
Replace all corroded fasteners.
•
Ensure that all fasteners are properly tightened and that there are no missing fasteners.
6.5.3 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 toler-
ances table, then replace the shaft.
Shaft inspection
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 0.03 mm | 0.001 in.
NOTICE:
Do not use shaft centers for the runout check as they may have been damaged during the re-
moval of the bearings or impeller.
Shaft inspection
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.
Figure 54: Shaft inspection
6.5.4 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.
6.5 Preassembly inspections
Model 3700i API610 / Type OH2 Installation, Operation, and Maintenance Manual
81
