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Which risk increases when lubricating oil viscosity declines in hydraulic machinery?

A)Reduced accumulator pressure maintenance is expected
B)Increased thermal expansion of the cylinder walls
C)Elevated possibility of internal pump cavitation
D)Greater risk of internal leakage develops

💡 Explanation

Increased internal leakage occurs because lower viscosity reduces the fluid's resistance to flow through internal clearances; the mechanism is viscous dissipation. Therefore, higher leakage occurs rather than cavitation or expansion; these are influenced more by pressure and temperature.

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