If it becomes necessary to start an axial piston hydraulic motor under conditions where the hydraulic fluid is colder than the lowest temperature recommended for proper operation, you should operate the system at __________.
• Hydraulic fluid viscosity changes at low temperature • Effects of load and pressure on cold hydraulic components • Manufacturer limits for startup procedures in cold conditions
• What happens inside a hydraulic motor if you apply high load or high pressure while the oil is still very thick from the cold? • Which choice best allows the oil and internal parts to warm up gradually without risking damage to pistons, shoes, or bearings? • Look for the option that reduces mechanical stress and avoids cavitation or scoring during the warm‑up period.
• Identify which choices apply load or high torque to the motor and which do not. • Consider which option allows the system to reach normal operating temperature before applying significant pressure or load. • Eliminate any choice that would cause rapid warm‑up under heavy stress to cold, viscous oil and tight clearances.
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