Explain centrifugal pump O/H. how to check trueness of shaft ?

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Put off breaker and remove fuse from motor starter box
Close suction and discharge valve
Remove suction and discharge pipe flange bolt & nut, coupling bolt of motor coupling
Remove pump foundation bolts & take out pump from motor
Remove impeller lock & nut & take out the impeller
Remove mechanical seal.
Remove bearing cover from other side & take out shaft with ball bearing
Renew mechanical seal and bearings if required.
Clean and inspect all parts and assemble.