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← ScienceWhich outcome results when oil temperature decreases in a hydrostatic transmission?
A)Increased torque converter stall speed
B)Reduced valve spool response time
C)Elevated system operating pressure
D)Decreased hydraulic pump volumetric efficiency✓
💡 Explanation
Decreased oil temperature raises viscosity, leading to increased internal leakage in the pump; therefore, volumetric efficiency drops because a greater portion of the pump's output is lost to leakage rather than delivering useful flow.
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