Red Seal Industrial Mechanic (Millwright) Practice Exam

How does temperature affect hydraulic fluid performance?

1. It has no effect on performance

2. Higher temperatures can decrease viscosity and increase wear

3. Lower temperatures improve hydraulic performance

4. Temperature only affects electrical systems

The correct answer is: Higher temperatures can decrease viscosity and increase wear

Higher temperatures can indeed decrease the viscosity of hydraulic fluids, which is a critical property that governs how the fluid flows and transmits force in hydraulic systems. As the temperature rises, the fluid becomes thinner, leading to lower resistance to flow. While lower viscosity can enhance fluid movement, it also poses a risk of increased wear on hydraulic components. When the hydraulic fluid is too thin, it may result in insufficient lubrication, potentially leading to accelerated wear on pumps, valves, and actuators. This can affect the overall efficiency and lifespan of the hydraulic system. Understanding the relationship between temperature and viscosity is essential for maintaining optimal performance in hydraulic systems. It highlights the importance of monitoring and managing operational temperatures to ensure that the hydraulic fluid remains within the recommended viscosity range, thereby minimizing wear and prolonging equipment life.