Overheating of a hydraulic system may be a result of __________.

Correct Answer: Option D — incorrect fluid viscosity

Hydraulic fluid viscosity is critical for system efficiency. If the viscosity is incorrect—specifically too low—internal leakage increases significantly across pump and motor clearances. This internal slippage generates excessive heat, leading to system overheating, reduced volumetric efficiency, and potential damage to precision-machined hydraulic components over time.