Fault Phenomenon: XCMG HB62K oil quality is normal when cold. After rain season operations (operating temperature), the hydraulic oil emulsifies, the system becomes noisy, and components eventually fail.

Troubleshooting Process:
– Checked tank cap seal: good sealing.
– Checked cooler: no internal leakage.
– Checked air filter: desiccant effective.
– Measured water content in oil at operating temperature: found excessive water content.

Root Cause: Water enters through the hydraulic tank breather, causing the oil to mix with water and emulsify.

Required Parts: Hydraulic oil and tank breather.