When testing a hydraulic system, what does a dye test help inspectors identify?

When testing a hydraulic system, what does a dye test help inspectors identify?

• A. Combustion leaks in the fuel system
• B. Fluid contamination levels
• C. Pressure gauge accuracy
• D. Leaks by tracing colored dye through lines

Answer: (D)

Dye tracing in a hydraulic system uses a colored tracer added to the fluid so any leak can be seen as the dye exits or migrates along the system. The dye travels with the hydraulic fluid, and when there’s a leak, it becomes visible at the leak point—sometimes flashing under UV light—allowing inspectors to pinpoint the exact location, including leaks that are small or hidden behind panels. This method directly reveals where fluid is escaping, which is what the test is designed to detect. It isn’t about testing fuel-system combustion leaks, measuring contamination levels, or verifying pressure gauge accuracy, which require different procedures.

Dye tracing in a hydraulic system uses a colored tracer added to the fluid so any leak can be seen as the dye exits or migrates along the system. The dye travels with the hydraulic fluid, and when there’s a leak, it becomes visible at the leak point—sometimes flashing under UV light—allowing inspectors to pinpoint the exact location, including leaks that are small or hidden behind panels. This method directly reveals where fluid is escaping, which is what the test is designed to detect. It isn’t about testing fuel-system combustion leaks, measuring contamination levels, or verifying pressure gauge accuracy, which require different procedures.