Question 162General Subjects - Assistant Engineer

The correct answer is D) incorrect fluid viscosity. Overheating of a hydraulic system is often caused by the use of a hydraulic fluid with the wrong viscosity. Incorrect fluid viscosity can lead to increased fluid friction and reduced pump efficiency, resulting in excessive heat generation within the system. This is the primary reason why incorrect fluid viscosity can cause overheating. The other options are not the main causes of overheating. A high oil level (A) would not directly lead to overheating, and changing pump discharge pressure (B) or continued slow recirculation (C) are normal operating conditions that should not result in overheating on their own.