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← TechnologyWhich outcome arises when a hydraulic directional control valve experiences pilot pressure starvation?
A)Actuator lock-up from spool seizure
B)Reduced cylinder force due to valve stiction
C)Increased system pressure from deadheading
D)Erratic motion and valve dithering✓
💡 Explanation
When pilot pressure is insufficient flow instability causes valve spool dithering by preventing valve to maintain a stable switching position, leading to erratic and jerky motion of the actuator connected. Thus the answer is erratic motion rather than spool seizure stiction, or overpressure, which have distinct causes..
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