Red Seal Industrial Mechanic (Millwright) Practice Exam

Which of the following actions is important for hydraulic system maintenance?

1. Regularly replacing the hydraulic fluid

2. Increasing pressure consistently

3. Minimizing the size of the hydraulic reservoir

4. Bypassing filters to enhance flow

The correct answer is: Regularly replacing the hydraulic fluid

Regularly replacing the hydraulic fluid is essential for maintaining a hydraulic system because hydraulic fluids are vital for the system's operation, providing lubrication, transferring power, and helping with heat dissipation. Over time, hydraulic fluid can degrade due to heat, contamination, and moisture, which can compromise its effectiveness and the overall performance of the system. Contaminants in the fluid can lead to wear and tear on the system's components, potentially resulting in breakdowns, inefficiencies, or even system failure. By replacing the hydraulic fluid at recommended intervals, you ensure that the system operates smoothly, and you extend the lifespan of the equipment. This practice also helps in maintaining the cleanliness of the hydraulic system, ensuring that filters and components can function optimally. In contrast, taking actions like increasing pressure consistently can lead to over-stressing components, minimizing the reservoir could compromise fluid availability and cooling, and bypassing filters might enhance flow temporarily but can allow contaminants to circulate, causing significant damage over time.