Heavy Duty Equipment Technician Red Seal Exam Prep · Question
Why is it generally considered best practice to equip a hydraulic reservoir with a breather cap that includes a filter (e.g., desiccant breather)?
Hydraulic reservoirs 'breathe' during system operation as fluid levels fluctuate. A filtered breather cap prevents airborne dust, particulate matter, and crucia
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Question: Why is it generally considered best practice to equip a hydraulic reservoir with a breather cap that includes a filter (e.g., desiccant breather)?
Answer options: ✅ To prevent airborne contaminants and moisture from entering the system.
- To allow atmospheric pressure to assist pump suction, increasing flow.
- To reduce internal reservoir pressure, preventing seal leaks.
- To provide a direct pathway for excess oil to return to the atmosphere.
Correct answer: To prevent airborne contaminants and moisture from entering the system.
Explanation: Hydraulic reservoirs 'breathe' during system operation as fluid levels fluctuate. A filtered breather cap prevents airborne dust, particulate matter, and crucially, moisture from entering the reservoir and contaminating the hydraulic fluid, which helps maintain fluid integrity and system longevity.
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