Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

Hydraulic fluids play a critical role in the operation and efficiency of hydraulic systems, and they are chosen based on factors such as temperature range, compatibility, and lubrication properties.

Water-based fluids are often utilized for their non-flammable nature and are commonly used in various applications, especially in systems where fire hazards are a concern. Petroleum-based fluids are the most widely used due to their excellent lubricating properties and availability. Phosphate ester fluids also have specific applications, particularly in environments where fire resistance is crucial, as they are not flammable and can provide good thermal stability.

In contrast, alcohol-based fluids are not typically used in hydraulic systems because they do not possess the necessary lubricating properties and can lead to increased wear and tear on hydraulic components. Their low viscosity can also result in the formation of vapor, leading to performance issues. Therefore, alcohol-based fluids are not a standard option in hydraulic applications compared to the alternatives listed.