What is the most common case of a hydraulic system failure?

• A. Air in the lines
• B. Pump failure
• C. A leak in the reservoir or ruptured line
• D. Electrical failure

Answer: (C)

Hydraulic system problems most often come from leaks. When the reservoir or a line develops a leak, fluid escapes and the system can’t maintain the necessary pressure, so actuators don’t move as they should or lose force entirely. Small leaks can go unnoticed for a time, but over the long run they steadily drop pressure, cause the pump to work harder to try to compensate, and can even pull air into the circuit, worsening performance. While air in the lines, pump failure, or electrical issues can cause serious symptoms, they’re less common root causes of hydraulic failure compared to a leak in the reservoir or ruptured line.