The hydraulic system acts as the “blood circulatory system” of a rotary drilling rig. During continuous high-load operations or in high-temperature environments, once the hydraulic oil temperature exceeds 80°C, it triggers seal aging, drops oil viscosity, and can even cause system failure.

The four main culprits behind system overheating and their troubleshooting steps include:

1. Radiator Clogging: Construction sites are highly dusty, and drilling dust easily adheres to the surface of the hydraulic radiator. Regularly use a high-pressure air or water gun for reverse cleaning to ensure unobstructed airflow.

2. Oil Degradation: This occurs when hydraulic oil is not changed for a long time or an incorrect oil grade is used. High-viscosity, anti-wear hydraulic oil meeting factory standards must be strictly used based on seasonal temperature fluctuations.

3. Improper Relief Valve Setting: If the system’s main relief valve pressure is set too low, hydraulic oil will frequently bypass back to the tank, converting substantial mechanical energy into thermal energy. Re-calibration of circuit pressures is required.

4. Internal Component Wear: Internal wear in hydraulic pumps or main valves increases internal leakage. This leakage process is accompanied by intense heat generation, requiring timely repair or replacement of core hydraulic components