When disassembling a back pullout design centrifugal pump, what is the first step you should take?

When disassembling a back pullout design centrifugal pump, following the manufacturer's instructions is crucial because these guidelines provide specific sequences and precautions that ensure the pump is disassembled safely and correctly. Different pump designs can have unique requirements, and manufacturers outline the exact steps necessary to avoid damaging components and to maintain safety during the operation.

By adhering to these instructions, a millwright can prevent potential issues such as misalignment, damage to seals or bearings, and safety hazards. Each pump may have nuances based on its design, materials, and configuration, making the manufacturer’s guidance relevant for optimal disassembly without unintended consequences.

The other options do represent actions that could be part of the disassembly process, but they lack the specificity and safety assurance provided by the manufacturer’s instructions.