Why is cleanliness crucial when working with fluid lines and fittings?

Cleanliness is crucial when working with fluid lines and fittings primarily because it prevents contamination that can damage system components. Contaminants such as dirt, dust, oil, or metallic particles can enter the fluid system and lead to issues such as corrosion, wear, and clogs. These contaminants can interfere with the operation of pumps, valves, and other components, potentially causing system failures, leaks, or reduced efficiency. Maintaining a clean environment during assembly and maintenance ensures that the integrity and performance of the hydraulic or pneumatic systems are upheld, which is vital for safety and operational reliability in various applications.