What might indicate that a jack is difficult to operate?

A jack that is difficult to operate often shows signs of low hydraulic fluid levels or air trapped in the system. When hydraulic fluid levels are low, there is insufficient liquid to create the necessary pressure for lifting, which can lead to sluggish performance or failure to operate. Similarly, if air is trapped within the hydraulic system, it can form bubbles that disrupt fluid flow and reduce the efficiency of the hydraulic mechanism. This can result in a jack that feels unresponsive or jerky when being operated, making it challenging for the user to lift loads smoothly.

While high torque levels and improper sizing can contribute to operational difficulties, they are not as directly related to hydraulic performance issues as the low fluid levels or trapped air. Changes in weight distribution might affect how a jack handles loads, but they do not inherently indicate difficulty in operation.