1. Design-Related Causes

• Excessive pump displacement leads to high overflow, increasing heat generation.

• Undersized oil tank reduces heat dissipation efficiency.

• Poor piping design: Small-diameter tubes, excessive bends, and long pipelines restrict flow, while the absence of an unloading circuit further elevates system temperature.

2. Operational Issues

• High ambient temperature or inadequate cooling.

• Improper oil viscosity (too high/low) or low power settings.

• Contamination: Foreign particles causing blockages or pump cavitation (dry friction), leading to localized overheating.

• Solenoid valve malfunction: Incomplete actuation increases current, overheating and potentially burning out the solenoid.

3. Component Wear or Leakage

• Pump/internal component wear: Leakage from the discharge to suction side causes throttling heat. Similar issues arise in other worn components.

• Unexpected leaks: Uncontrolled flow through leaks generates throttling heat, sharply raising oil temperature.