Red Seal Industrial Mechanic (Millwright) Practice Exam

What is the primary purpose of a filter in hydraulic systems?

1. To improve the flow rate of hydraulic fluid

2. To remove contaminants from the fluid

3. To reduce the temperature of the hydraulic fluid

4. To increase the pressure in the hydraulic system

The correct answer is: To remove contaminants from the fluid

The primary purpose of a filter in hydraulic systems is to remove contaminants from the fluid. Hydraulic systems operate under high pressures and rely on clean fluid to function efficiently and effectively. Contaminants such as dirt, metal particles, and water can cause significant damage to hydraulic components, leading to equipment failure, increased maintenance costs, and reduced system performance. By removing these harmful particles, filters help maintain fluid cleanliness, ensuring that the system operates within its designed parameters and extends the lifespan of components such as pumps, valves, and actuators. This ultimately enhances the reliability and efficiency of the hydraulic system. While improving flow rates, reducing temperature, and increasing pressure can be important in other contexts or system considerations, the fundamental and essential role of the filter is to safeguard the hydraulic fluid’s quality by eliminating impurities.