OEM HITACHI EX120-5 AIR BREATHER CAP (OEM HI 4188642) | Tonkee®

Breather Element: At its core, the cap contains a breather element, often made of a porous material.

This element allows the exchange of air between the hydraulic reservoir and the external environment while trapping contaminants.

Threaded Connection: The cap is designed with threaded connections that ensure a secure and airtight fit to the breather port on the hydraulic reservoir or tank.

Ventilation: The breather cap provides a controlled venting mechanism. It allows air to flow into the reservoir as hydraulic fluid is consumed or as temperature changes occur, preventing vacuum or pressure buildup that could damage seals and gaskets.

The primary function of the Hitachi EX120-5 air breather cap is to maintain a clean and stable environment within the hydraulic reservoir. It accomplishes this through the following processes:

Filtration: The breather element inside the cap filters out airborne contaminants, preventing them from entering the hydraulic system. This is crucial because even tiny particles can cause wear and tear on hydraulic components.

Pressure Equalization: As hydraulic fluid is used or as temperatures fluctuate, the breather cap ensures that pressure within the reservoir remains within safe limits.

Excessive pressure or vacuum can lead to leaks and system failures.

Moisture Prevention: The cap also helps to prevent moisture from entering the hydraulic reservoir, as water can emulsify with hydraulic fluid and reduce its effectiveness.

Proper maintenance of the Hitachi EX120-5 air breather cap is essential to ensure its continued functionality and the reliability of the hydraulic system. Routine maintenance tasks include:

Inspection: Regularly inspect the breather cap for signs of damage, wear, or clogging. Replace it if any issues are detected.

Cleaning: Clean the exterior of the breather cap to remove dirt and debris that may obstruct airflow.

Replacement: When the breather element becomes clogged or loses its filtering efficiency, replace it with a new one to maintain proper filtration.

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