Fault Phenomenon: Bauer BG30 rotary drilling rig hydraulic tank level rises abnormally, and the hydraulic oil appears emulsified.

Troubleshooting Process:
– Checked cooler: water cooler core perforated.
– Checked water pressure: cooling water pressure higher than hydraulic system back pressure.
– Checked oil sample: excessive water content.
– Checked water tank: engine coolant level drops abnormally.

Root Cause: The hydraulic oil water cooler core corroded and perforated, allowing cooling water to seep into the hydraulic system under high pressure differential, causing oil emulsification.

Required Parts: Replace hydraulic oil water cooler core, replace all hydraulic oil.