What are the most common causes of hydraulic system failure?

The most common causes of hydraulic system failure include contamination of hydraulic fluid, which can lead to wear and damage of components; leaks in hoses, fittings, or seals that result in loss of pressure; and inadequate maintenance, such as not changing filters or fluid regularly. Additionally, overheating can occur due to excessive load or insufficient cooling, causing components to degrade or fail. Lastly, improper system design or installation can lead to imbalances and stress on the system, contributing to failure.