Invisible leaks in hydraulic cylinders occur where?

Invisible leaks in hydraulic cylinders are primarily associated with the areas where the piston and the rod interact with the cylinder wall. These interactions can lead to leaks that are not easily detected, hence the term "invisible."

When there is a compromised seal between the piston and the cylinder wall, hydraulic fluid can escape, which can significantly affect the performance and efficiency of the hydraulic system. Similarly, the area between the rod and the cylinder wall is another critical point where leaks can occur. As hydraulic systems operate, wear and tear, along with inadequate sealing, can lead to fluid loss here as well.

Both locations are crucial to monitor in a hydraulic system because undetected leaks can lead to decreased pressure, reduced efficiency, and potential system failure. Therefore, it's important to understand that both the interface between the piston and the cylinder wall and the interface between the rod and the cylinder wall are susceptible to these types of leaks, making the selection that includes both correct.