Final answer:
It is not recommended to tighten a hydraulic hose under pressure as it can cause leaks or ruptures. The pressure should be released before making any adjustments to the hydraulic system.
Step-by-step explanation:
Hydraulic hoses are designed to withstand high pressure and are typically made of durable materials like rubber or reinforced plastic. However, it is not recommended to tighten a hydraulic hose while it is under pressure. This is because tightening or loosening the hose can cause leaks or ruptures in the hose, which can be dangerous. It is important to release the pressure before making any adjustments to the hydraulic system.