Fault Phenomenon: XCMG TY220 dozer after operation, a large amount of oil mist is emitted from the transmission breather, oil level drops quickly.

Troubleshooting Process:
– Checked breather: breather filter clogged.
– Checked seals: transmission input/output oil seals leaking air.
– Checked oil level: level too high.
– Checked vent: internal vent passages blocked.

Root Cause: The transmission breather is clogged; internal gears churning generate hot gas and oil mist that cannot escape, increasing pressure and forcing oil out through the breather or seals.

Required Parts: Replace transmission breather, check and clear internal vent passages.