Can you tighten a hydraulic hose while it is under pressure?

Tightening a hydraulic hose while it is under pressure is not safe and should not be done. When hydraulic systems are pressurized, the fluid within the hoses is at a high pressure, which can lead to serious safety hazards. If you attempt to tighten a hose under these conditions, it could cause the hose to burst or leak fluid violently, potentially resulting in injury or damage to the machinery. Therefore, the safe practice is to always relieve the pressure from the hydraulic system before making any adjustments or repairs to the hoses. This ensures the safety of the operator and the integrity of the system.