Which component protects debris from entering the hydraulic system on the inward stroke?

The rod wiper is designed to protect the hydraulic system by preventing debris, dirt, moisture, and other contaminants from entering during the inward stroke of the hydraulic cylinder. As the rod retracts, the wiper draws its edge across the rod surface, scraping off any particles that may adhere to it. This action helps to maintain the integrity of the hydraulic fluid and prolongs the life of the internal components by minimizing wear and tear caused by contaminants.

The rod wiper's role is crucial, especially in environments where hydraulic equipment is exposed to harsh conditions, as even small amounts of debris can lead to significant performance issues or failures in the hydraulic system. In contrast, other components mentioned, like the seal gland, primarily serve to maintain pressure and fluid retention within the system, while the piston ring is more focused on creating a seal between moving parts and dust caps generally provide protection against external elements when the rod is not in motion. Thus, the rod wiper is specifically tailored for the task of preventing foreign materials from entering during operation.