What is an essential factor in ensuring the trailer hydraulic system operates properly?

Sufficient hydraulic fluid is crucial for the proper operation of the trailer hydraulic system because hydraulic systems rely on the fluid to transmit force. The fluid not only moves through the system but also lubricates components, preventing damage and allowing for efficient operation. If there is an inadequate amount of hydraulic fluid, the system can experience issues such as reduced performance or complete failure, as there won't be enough fluid to create the necessary pressure and movement.

In contrast, overheating components can indicate a problem but does not directly ensure the system operates properly; it is often a sign of insufficient fluid or improper maintenance. Higher viscosity fluid may not be suitable for all applications, as it can cause resistance and reduce the efficiency of fluid movement in the system. Excessive wear on parts can lead to hydraulic leaks, reduced performance, and potential system failure, which would hinder proper operation rather than ensure it. Thus, maintaining a sufficient level of hydraulic fluid is the key factor for reliable and effective operation in a trailer hydraulic system.