Fault Phenomenon: XCMG XR280 rotary drilling rig after continuous operation, hydraulic oil temperature exceeds 90°C, machine automatically reduces power.

Troubleshooting Process:
– Checked cooler: air-cooled cooler clogged with dust.
– Checked fan: fan motor speed low or belt slipping.
– Checked relief valve: system in relief state for extended period.
– Checked oil: incorrect oil viscosity.

Root Cause: The hydraulic oil cooler surface is completely covered with site dust, resulting in almost zero cooling efficiency.

Required Parts: Clean radiator with compressed air or steam.